diff --git a/libs/partners/ai21/tests/integration_tests/test_standard.py b/libs/partners/ai21/tests/integration_tests/test_standard.py
index 2d74ca59ec..2235dcd321 100644
--- a/libs/partners/ai21/tests/integration_tests/test_standard.py
+++ b/libs/partners/ai21/tests/integration_tests/test_standard.py
@@ -10,98 +10,38 @@ from langchain_standard_tests.integration_tests import ChatModelIntegrationTests
 from langchain_ai21 import ChatAI21
 
 
-class TestAI21J2(ChatModelIntegrationTests):
+class BaseTestAI21(ChatModelIntegrationTests):
     def teardown(self) -> None:
         # avoid getting rate limited
         time.sleep(1)
 
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatAI21
 
     @pytest.mark.xfail(reason="Emits AIMessage instead of AIMessageChunk.")
-    def test_stream(
-        self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-    ) -> None:
-        super().test_stream(
-            chat_model_class,
-            chat_model_params,
-        )
+    def test_stream(self, model: BaseChatModel) -> None:
+        super().test_stream(model)
 
     @pytest.mark.xfail(reason="Emits AIMessage instead of AIMessageChunk.")
-    async def test_astream(
-        self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-    ) -> None:
-        await super().test_astream(
-            chat_model_class,
-            chat_model_params,
-        )
+    async def test_astream(self, model: BaseChatModel) -> None:
+        await super().test_astream(model)
 
     @pytest.mark.xfail(reason="Not implemented.")
-    def test_usage_metadata(
-        self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-    ) -> None:
-        super().test_usage_metadata(
-            chat_model_class,
-            chat_model_params,
-        )
+    def test_usage_metadata(self, model: BaseChatModel) -> None:
+        super().test_usage_metadata(model)
 
-    @pytest.fixture
+
+class TestAI21J2(BaseTestAI21):
+    @property
     def chat_model_params(self) -> dict:
         return {
             "model": "j2-ultra",
         }
 
 
-class TestAI21Jamba(ChatModelIntegrationTests):
-    def teardown(self) -> None:
-        # avoid getting rate limited
-        time.sleep(1)
-
-    @pytest.fixture
-    def chat_model_class(self) -> Type[BaseChatModel]:
-        return ChatAI21
-
-    @pytest.mark.xfail(reason="Emits AIMessage instead of AIMessageChunk.")
-    def test_stream(
-        self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-    ) -> None:
-        super().test_stream(
-            chat_model_class,
-            chat_model_params,
-        )
-
-    @pytest.mark.xfail(reason="Emits AIMessage instead of AIMessageChunk.")
-    async def test_astream(
-        self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-    ) -> None:
-        await super().test_astream(
-            chat_model_class,
-            chat_model_params,
-        )
-
-    @pytest.mark.xfail(reason="Not implemented.")
-    def test_usage_metadata(
-        self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-    ) -> None:
-        super().test_usage_metadata(
-            chat_model_class,
-            chat_model_params,
-        )
-
-    @pytest.fixture
+class TestAI21Jamba(BaseTestAI21):
+    @property
     def chat_model_params(self) -> dict:
         return {
             "model": "jamba-instruct-preview",
diff --git a/libs/partners/ai21/tests/unit_tests/test_standard.py b/libs/partners/ai21/tests/unit_tests/test_standard.py
index e0b9c5b98c..f5a0e3eb8a 100644
--- a/libs/partners/ai21/tests/unit_tests/test_standard.py
+++ b/libs/partners/ai21/tests/unit_tests/test_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
 
@@ -10,11 +9,11 @@ from langchain_ai21 import ChatAI21
 
 
 class TestAI21J2(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatAI21
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
         return {
             "model": "j2-ultra",
@@ -23,11 +22,11 @@ class TestAI21J2(ChatModelUnitTests):
 
 
 class TestAI21Jamba(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatAI21
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
         return {
             "model": "jamba-instruct",
diff --git a/libs/partners/anthropic/tests/integration_tests/test_standard.py b/libs/partners/anthropic/tests/integration_tests/test_standard.py
index 464f5f947e..28a194e75a 100644
--- a/libs/partners/anthropic/tests/integration_tests/test_standard.py
+++ b/libs/partners/anthropic/tests/integration_tests/test_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.integration_tests import ChatModelIntegrationTests
 
@@ -10,12 +9,10 @@ from langchain_anthropic import ChatAnthropic
 
 
 class TestAnthropicStandard(ChatModelIntegrationTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatAnthropic
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
-        return {
-            "model": "claude-3-haiku-20240307",
-        }
+        return {"model": "claude-3-haiku-20240307"}
diff --git a/libs/partners/anthropic/tests/unit_tests/test_standard.py b/libs/partners/anthropic/tests/unit_tests/test_standard.py
index 2650554e79..7976dcb2bc 100644
--- a/libs/partners/anthropic/tests/unit_tests/test_standard.py
+++ b/libs/partners/anthropic/tests/unit_tests/test_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
 
@@ -10,12 +9,10 @@ from langchain_anthropic import ChatAnthropic
 
 
 class TestAnthropicStandard(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatAnthropic
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
-        return {
-            "model": "claude-3-haiku-20240307",
-        }
+        return {"model": "claude-3-haiku-20240307"}
diff --git a/libs/partners/fireworks/langchain_fireworks/chat_models.py b/libs/partners/fireworks/langchain_fireworks/chat_models.py
index 48de39f8c8..fb439a6811 100644
--- a/libs/partners/fireworks/langchain_fireworks/chat_models.py
+++ b/libs/partners/fireworks/langchain_fireworks/chat_models.py
@@ -296,6 +296,8 @@ class ChatFireworks(BaseChatModel):
     """Model name to use."""
     temperature: float = 0.0
     """What sampling temperature to use."""
+    stop: Optional[Union[str, List[str]]] = Field(None, alias="stop_sequences")
+    """Default stop sequences."""
     model_kwargs: Dict[str, Any] = Field(default_factory=dict)
     """Holds any model parameters valid for `create` call not explicitly specified."""
     fireworks_api_key: SecretStr = Field(default=None, alias="api_key")
@@ -314,8 +316,8 @@ class ChatFireworks(BaseChatModel):
     """Number of chat completions to generate for each prompt."""
     max_tokens: Optional[int] = None
     """Maximum number of tokens to generate."""
-    stop: Optional[List[str]] = Field(None, alias="stop_sequences")
-    """Default stop sequences."""
+    max_retries: Optional[int] = None
+    """Maximum number of retries to make when generating."""
 
     class Config:
         """Configuration for this pydantic object."""
@@ -360,6 +362,9 @@ class ChatFireworks(BaseChatModel):
             values["client"] = Fireworks(**client_params).chat.completions
         if not values.get("async_client"):
             values["async_client"] = AsyncFireworks(**client_params).chat.completions
+        if values["max_retries"]:
+            values["client"]._max_retries = values["max_retries"]
+            values["async_client"]._max_retries = values["max_retries"]
         return values
 
     @property
diff --git a/libs/partners/fireworks/tests/integration_tests/test_standard.py b/libs/partners/fireworks/tests/integration_tests/test_standard.py
index bfeeca693d..84e118c2a9 100644
--- a/libs/partners/fireworks/tests/integration_tests/test_standard.py
+++ b/libs/partners/fireworks/tests/integration_tests/test_standard.py
@@ -10,11 +10,11 @@ from langchain_fireworks import ChatFireworks
 
 
 class TestFireworksStandard(ChatModelIntegrationTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatFireworks
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
         return {
             "model": "accounts/fireworks/models/firefunction-v1",
@@ -22,12 +22,5 @@ class TestFireworksStandard(ChatModelIntegrationTests):
         }
 
     @pytest.mark.xfail(reason="Not yet implemented.")
-    def test_tool_message_histories_list_content(
-        self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-        chat_model_has_tool_calling: bool,
-    ) -> None:
-        super().test_tool_message_histories_list_content(
-            chat_model_class, chat_model_params, chat_model_has_tool_calling
-        )
+    def test_tool_message_histories_list_content(self, model: BaseChatModel) -> None:
+        super().test_tool_message_histories_list_content(model)
diff --git a/libs/partners/fireworks/tests/unit_tests/test_standard.py b/libs/partners/fireworks/tests/unit_tests/test_standard.py
index 455af60288..6e5bdc2f50 100644
--- a/libs/partners/fireworks/tests/unit_tests/test_standard.py
+++ b/libs/partners/fireworks/tests/unit_tests/test_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
 
@@ -10,12 +9,10 @@ from langchain_fireworks import ChatFireworks
 
 
 class TestFireworksStandard(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatFireworks
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
-        return {
-            "api_key": "test_api_key",
-        }
+        return {"api_key": "test_api_key"}
diff --git a/libs/partners/groq/langchain_groq/chat_models.py b/libs/partners/groq/langchain_groq/chat_models.py
index 7c46e266a8..df49602b73 100644
--- a/libs/partners/groq/langchain_groq/chat_models.py
+++ b/libs/partners/groq/langchain_groq/chat_models.py
@@ -304,6 +304,8 @@ class ChatGroq(BaseChatModel):
     """Model name to use."""
     temperature: float = 0.7
     """What sampling temperature to use."""
+    stop: Optional[Union[List[str], str]] = Field(None, alias="stop_sequences")
+    """Default stop sequences."""
     model_kwargs: Dict[str, Any] = Field(default_factory=dict)
     """Holds any model parameters valid for `create` call not explicitly specified."""
     groq_api_key: Optional[SecretStr] = Field(default=None, alias="api_key")
@@ -326,8 +328,6 @@ class ChatGroq(BaseChatModel):
     """Number of chat completions to generate for each prompt."""
     max_tokens: Optional[int] = None
     """Maximum number of tokens to generate."""
-    stop: Optional[List[str]] = Field(None, alias="stop_sequences")
-    """Default stop sequences."""
     default_headers: Union[Mapping[str, str], None] = None
     default_query: Union[Mapping[str, object], None] = None
     # Configure a custom httpx client. See the
@@ -449,7 +449,7 @@ class ChatGroq(BaseChatModel):
         if ls_max_tokens := params.get("max_tokens", self.max_tokens):
             ls_params["ls_max_tokens"] = ls_max_tokens
         if ls_stop := stop or params.get("stop", None) or self.stop:
-            ls_params["ls_stop"] = ls_stop
+            ls_params["ls_stop"] = ls_stop if isinstance(ls_stop, list) else [ls_stop]
         return ls_params
 
     def _generate(
@@ -804,10 +804,19 @@ class ChatGroq(BaseChatModel):
 
         formatted_tools = [convert_to_openai_tool(tool) for tool in tools]
         if tool_choice is not None and tool_choice:
+            if tool_choice == "any":
+                if len(tools) > 1:
+                    raise ValueError(
+                        f"Groq does not currently support {tool_choice=}. Should "
+                        f"be one of 'auto', 'none', or the name of the tool to call."
+                    )
+                else:
+                    tool_choice = convert_to_openai_tool(tools[0])["function"]["name"]
             if isinstance(tool_choice, str) and (
                 tool_choice not in ("auto", "any", "none")
             ):
                 tool_choice = {"type": "function", "function": {"name": tool_choice}}
+            # TODO: Remove this update once 'any' is supported.
             if isinstance(tool_choice, dict) and (len(formatted_tools) != 1):
                 raise ValueError(
                     "When specifying `tool_choice`, you must provide exactly one "
diff --git a/libs/partners/groq/pyproject.toml b/libs/partners/groq/pyproject.toml
index 15f2334a80..daab187a7a 100644
--- a/libs/partners/groq/pyproject.toml
+++ b/libs/partners/groq/pyproject.toml
@@ -92,5 +92,6 @@ filterwarnings = [
   'ignore:The method `ChatGroq.with_structured_output` is in beta',
   # Maintain support for pydantic 1.X
   'default:The `dict` method is deprecated; use `model_dump` instead:DeprecationWarning',
+  "ignore:tool_choice='any' is not currently supported. Converting to 'auto'.",
 ]
 asyncio_mode = "auto"
diff --git a/libs/partners/groq/tests/integration_tests/test_standard.py b/libs/partners/groq/tests/integration_tests/test_standard.py
index b458d8adf1..4234ff616c 100644
--- a/libs/partners/groq/tests/integration_tests/test_standard.py
+++ b/libs/partners/groq/tests/integration_tests/test_standard.py
@@ -10,17 +10,10 @@ from langchain_groq import ChatGroq
 
 
 class TestGroqStandard(ChatModelIntegrationTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatGroq
 
     @pytest.mark.xfail(reason="Not yet implemented.")
-    def test_tool_message_histories_list_content(
-        self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-        chat_model_has_tool_calling: bool,
-    ) -> None:
-        super().test_tool_message_histories_list_content(
-            chat_model_class, chat_model_params, chat_model_has_tool_calling
-        )
+    def test_tool_message_histories_list_content(self, model: BaseChatModel) -> None:
+        super().test_tool_message_histories_list_content(model)
diff --git a/libs/partners/groq/tests/unit_tests/test_standard.py b/libs/partners/groq/tests/unit_tests/test_standard.py
index 38841230a9..c677d6378e 100644
--- a/libs/partners/groq/tests/unit_tests/test_standard.py
+++ b/libs/partners/groq/tests/unit_tests/test_standard.py
@@ -2,14 +2,26 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
-from langchain_standard_tests.unit_tests import ChatModelUnitTests
+from langchain_core.runnables import RunnableBinding
+from langchain_standard_tests.unit_tests.chat_models import (
+    ChatModelUnitTests,
+    Person,
+    my_adder_tool,
+)
 
 from langchain_groq import ChatGroq
 
 
 class TestGroqStandard(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatGroq
+
+    def test_bind_tool_pydantic(self, model: BaseChatModel) -> None:
+        """Does not currently support tool_choice='any'."""
+        if not self.has_tool_calling:
+            return
+
+        tool_model = model.bind_tools([Person, Person.schema(), my_adder_tool])
+        assert isinstance(tool_model, RunnableBinding)
diff --git a/libs/partners/mistralai/tests/integration_tests/test_standard.py b/libs/partners/mistralai/tests/integration_tests/test_standard.py
index d9b8ff1969..6971719930 100644
--- a/libs/partners/mistralai/tests/integration_tests/test_standard.py
+++ b/libs/partners/mistralai/tests/integration_tests/test_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.integration_tests import ChatModelIntegrationTests
 
@@ -10,13 +9,10 @@ from langchain_mistralai import ChatMistralAI
 
 
 class TestMistralStandard(ChatModelIntegrationTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatMistralAI
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
-        return {
-            "model": "mistral-large-latest",
-            "temperature": 0,
-        }
+        return {"model": "mistral-large-latest", "temperature": 0}
diff --git a/libs/partners/mistralai/tests/unit_tests/test_standard.py b/libs/partners/mistralai/tests/unit_tests/test_standard.py
index 46ef3ec3a4..100a766e89 100644
--- a/libs/partners/mistralai/tests/unit_tests/test_standard.py
+++ b/libs/partners/mistralai/tests/unit_tests/test_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
 
@@ -10,6 +9,6 @@ from langchain_mistralai import ChatMistralAI
 
 
 class TestMistralStandard(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatMistralAI
diff --git a/libs/partners/openai/langchain_openai/chat_models/azure.py b/libs/partners/openai/langchain_openai/chat_models/azure.py
index f820228787..30db136384 100644
--- a/libs/partners/openai/langchain_openai/chat_models/azure.py
+++ b/libs/partners/openai/langchain_openai/chat_models/azure.py
@@ -3,13 +3,18 @@ from __future__ import annotations
 
 import logging
 import os
-from typing import Any, Callable, Dict, List, Optional, Union
+from typing import Any, Callable, Dict, List, Literal, Optional, Sequence, Type, Union
 
 import openai
+from langchain_core.language_models import LanguageModelInput
 from langchain_core.language_models.chat_models import LangSmithParams
+from langchain_core.messages import BaseMessage
 from langchain_core.outputs import ChatResult
-from langchain_core.pydantic_v1 import Field, SecretStr, root_validator
+from langchain_core.pydantic_v1 import BaseModel, Field, SecretStr, root_validator
+from langchain_core.runnables import Runnable
+from langchain_core.tools import BaseTool
 from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env
+from langchain_core.utils.function_calling import convert_to_openai_tool
 
 from langchain_openai.chat_models.base import BaseChatOpenAI
 
@@ -210,6 +215,27 @@ class AzureChatOpenAI(BaseChatOpenAI):
             ).chat.completions
         return values
 
+    def bind_tools(
+        self,
+        tools: Sequence[Union[Dict[str, Any], Type[BaseModel], Callable, BaseTool]],
+        *,
+        tool_choice: Optional[
+            Union[dict, str, Literal["auto", "none", "required", "any"], bool]
+        ] = None,
+        **kwargs: Any,
+    ) -> Runnable[LanguageModelInput, BaseMessage]:
+        # As of 05/2024 Azure OpenAI doesn't support tool_choice="required".
+        # TODO: Update this condition once tool_choice="required" is supported.
+        if tool_choice in ("any", "required", True):
+            if len(tools) > 1:
+                raise ValueError(
+                    f"Azure OpenAI does not currently support {tool_choice=}. Should "
+                    f"be one of 'auto', 'none', or the name of the tool to call."
+                )
+            else:
+                tool_choice = convert_to_openai_tool(tools[0])["function"]["name"]
+        return super().bind_tools(tools, tool_choice=tool_choice, **kwargs)
+
     @property
     def _identifying_params(self) -> Dict[str, Any]:
         """Get the identifying parameters."""
diff --git a/libs/partners/openai/langchain_openai/chat_models/base.py b/libs/partners/openai/langchain_openai/chat_models/base.py
index 2df447b70f..91edb1309d 100644
--- a/libs/partners/openai/langchain_openai/chat_models/base.py
+++ b/libs/partners/openai/langchain_openai/chat_models/base.py
@@ -345,6 +345,8 @@ class BaseChatOpenAI(BaseChatModel):
     http_async_client: Union[Any, None] = None
     """Optional httpx.AsyncClient. Only used for async invocations. Must specify 
         http_client as well if you'd like a custom client for sync invocations."""
+    stop: Optional[Union[List[str], str]] = Field(default=None, alias="stop_sequences")
+    """Default stop sequences."""
 
     class Config:
         """Configuration for this pydantic object."""
@@ -441,6 +443,7 @@ class BaseChatOpenAI(BaseChatModel):
             "stream": self.streaming,
             "n": self.n,
             "temperature": self.temperature,
+            "stop": self.stop,
             **self.model_kwargs,
         }
         if self.max_tokens is not None:
@@ -548,8 +551,6 @@ class BaseChatOpenAI(BaseChatModel):
     ) -> Tuple[List[Dict[str, Any]], Dict[str, Any]]:
         params = self._default_params
         if stop is not None:
-            if "stop" in params:
-                raise ValueError("`stop` found in both the input and default params.")
             params["stop"] = stop
         message_dicts = [_convert_message_to_dict(m) for m in messages]
         return message_dicts, params
@@ -871,15 +872,7 @@ class BaseChatOpenAI(BaseChatModel):
                 if tool_choice == "any":
                     tool_choice = "required"
             elif isinstance(tool_choice, bool):
-                if len(tools) > 1:
-                    raise ValueError(
-                        "tool_choice=True can only be used when a single tool is "
-                        f"passed in, received {len(tools)} tools."
-                    )
-                tool_choice = {
-                    "type": "function",
-                    "function": {"name": formatted_tools[0]["function"]["name"]},
-                }
+                tool_choice = "required"
             elif isinstance(tool_choice, dict):
                 tool_names = [
                     formatted_tool["function"]["name"]
@@ -1094,7 +1087,7 @@ class BaseChatOpenAI(BaseChatModel):
                     "schema must be specified when method is 'function_calling'. "
                     "Received None."
                 )
-            llm = self.bind_tools([schema], tool_choice=True)
+            llm = self.bind_tools([schema], tool_choice="any")
             if is_pydantic_schema:
                 output_parser: OutputParserLike = PydanticToolsParser(
                     tools=[schema], first_tool_only=True
diff --git a/libs/partners/openai/langchain_openai/llms/base.py b/libs/partners/openai/langchain_openai/llms/base.py
index d156fcc602..07d864ab7f 100644
--- a/libs/partners/openai/langchain_openai/llms/base.py
+++ b/libs/partners/openai/langchain_openai/llms/base.py
@@ -440,8 +440,6 @@ class BaseOpenAI(BaseLLM):
     ) -> List[List[str]]:
         """Get the sub prompts for llm call."""
         if stop is not None:
-            if "stop" in params:
-                raise ValueError("`stop` found in both the input and default params.")
             params["stop"] = stop
         if params["max_tokens"] == -1:
             if len(prompts) != 1:
diff --git a/libs/partners/openai/tests/integration_tests/chat_models/test_azure_standard.py b/libs/partners/openai/tests/integration_tests/chat_models/test_azure_standard.py
index ad21b06311..8cddaac726 100644
--- a/libs/partners/openai/tests/integration_tests/chat_models/test_azure_standard.py
+++ b/libs/partners/openai/tests/integration_tests/chat_models/test_azure_standard.py
@@ -3,7 +3,6 @@
 import os
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.integration_tests import ChatModelIntegrationTests
 
@@ -19,15 +18,15 @@ DEPLOYMENT_NAME = os.environ.get(
 
 
 class TestOpenAIStandard(ChatModelIntegrationTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return AzureChatOpenAI
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
         return {
             "deployment_name": DEPLOYMENT_NAME,
             "openai_api_version": OPENAI_API_VERSION,
             "azure_endpoint": OPENAI_API_BASE,
-            "openai_api_key": OPENAI_API_KEY,
+            "api_key": OPENAI_API_KEY,
         }
diff --git a/libs/partners/openai/tests/integration_tests/chat_models/test_base_standard.py b/libs/partners/openai/tests/integration_tests/chat_models/test_base_standard.py
index 48cdb4d8e7..b4b925aa38 100644
--- a/libs/partners/openai/tests/integration_tests/chat_models/test_base_standard.py
+++ b/libs/partners/openai/tests/integration_tests/chat_models/test_base_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.integration_tests import ChatModelIntegrationTests
 
@@ -10,6 +9,6 @@ from langchain_openai import ChatOpenAI
 
 
 class TestOpenAIStandard(ChatModelIntegrationTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatOpenAI
diff --git a/libs/partners/openai/tests/integration_tests/llms/test_base.py b/libs/partners/openai/tests/integration_tests/llms/test_base.py
index 651f94ef1b..b5e4defb71 100644
--- a/libs/partners/openai/tests/integration_tests/llms/test_base.py
+++ b/libs/partners/openai/tests/integration_tests/llms/test_base.py
@@ -99,13 +99,6 @@ def test_openai_stop_valid() -> None:
     assert first_output == second_output
 
 
-def test_openai_stop_error() -> None:
-    """Test openai stop logic on bad configuration."""
-    llm = OpenAI(stop="3", temperature=0)
-    with pytest.raises(ValueError):
-        llm.invoke("write an ordered list of five items", stop=["\n"])
-
-
 @pytest.mark.scheduled
 def test_openai_streaming() -> None:
     """Test streaming tokens from OpenAI."""
diff --git a/libs/partners/openai/tests/unit_tests/chat_models/test_azure_standard.py b/libs/partners/openai/tests/unit_tests/chat_models/test_azure_standard.py
index 40c4ff2d0c..d75cf98bc8 100644
--- a/libs/partners/openai/tests/unit_tests/chat_models/test_azure_standard.py
+++ b/libs/partners/openai/tests/unit_tests/chat_models/test_azure_standard.py
@@ -2,23 +2,31 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
+from langchain_core.runnables import RunnableBinding
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
+from langchain_standard_tests.unit_tests.chat_models import Person, my_adder_tool
 
 from langchain_openai import AzureChatOpenAI
 
 
 class TestOpenAIStandard(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return AzureChatOpenAI
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
         return {
             "deployment_name": "test",
             "openai_api_version": "2021-10-01",
             "azure_endpoint": "https://test.azure.com",
-            "openai_api_key": "test",
         }
+
+    def test_bind_tool_pydantic(self, model: BaseChatModel) -> None:
+        """Does not currently support tool_choice='any'."""
+        if not self.has_tool_calling:
+            return
+
+        tool_model = model.bind_tools([Person, Person.schema(), my_adder_tool])
+        assert isinstance(tool_model, RunnableBinding)
diff --git a/libs/partners/openai/tests/unit_tests/chat_models/test_base_standard.py b/libs/partners/openai/tests/unit_tests/chat_models/test_base_standard.py
index 5936989a34..34198d0fb9 100644
--- a/libs/partners/openai/tests/unit_tests/chat_models/test_base_standard.py
+++ b/libs/partners/openai/tests/unit_tests/chat_models/test_base_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
 
@@ -10,6 +9,6 @@ from langchain_openai import ChatOpenAI
 
 
 class TestOpenAIStandard(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatOpenAI
diff --git a/libs/partners/together/poetry.lock b/libs/partners/together/poetry.lock
index 51867e30b1..f43b7a1b7f 100644
--- a/libs/partners/together/poetry.lock
+++ b/libs/partners/together/poetry.lock
@@ -566,7 +566,7 @@ files = [
 
 [[package]]
 name = "langchain-core"
-version = "0.2.4"
+version = "0.2.7"
 description = "Building applications with LLMs through composability"
 optional = false
 python-versions = ">=3.8.1,<4.0"
@@ -575,15 +575,12 @@ develop = true
 
 [package.dependencies]
 jsonpatch = "^1.33"
-langsmith = "^0.1.66"
-packaging = "^23.2"
+langsmith = "^0.1.75"
+packaging = ">=23.2,<25"
 pydantic = ">=1,<3"
 PyYAML = ">=5.3"
 tenacity = "^8.1.0"
 
-[package.extras]
-extended-testing = ["jinja2 (>=3,<4)"]
-
 [package.source]
 type = "directory"
 url = "../../core"
@@ -608,7 +605,7 @@ url = "../openai"
 
 [[package]]
 name = "langchain-standard-tests"
-version = "0.1.0"
+version = "0.1.1"
 description = "Standard tests for LangChain implementations"
 optional = false
 python-versions = ">=3.8.1,<4.0"
@@ -625,13 +622,13 @@ url = "../../standard-tests"
 
 [[package]]
 name = "langsmith"
-version = "0.1.69"
+version = "0.1.77"
 description = "Client library to connect to the LangSmith LLM Tracing and Evaluation Platform."
 optional = false
 python-versions = "<4.0,>=3.8.1"
 files = [
-    {file = "langsmith-0.1.69-py3-none-any.whl", hash = "sha256:3d7bd6fadb0852fc4cd2e7cf8a1593306046900052da3970bb2b48ed21cc73d8"},
-    {file = "langsmith-0.1.69.tar.gz", hash = "sha256:0146764904a8e479620b7e73efcba1cf172b621799564dd7e7342859c05c264a"},
+    {file = "langsmith-0.1.77-py3-none-any.whl", hash = "sha256:2202cc21b1ed7e7b9e5d2af2694be28898afa048c09fdf09f620cbd9301755ae"},
+    {file = "langsmith-0.1.77.tar.gz", hash = "sha256:4ace09077a9a4e412afeb4b517ca68e7de7b07f36e4792dc8236ac5207c0c0c7"},
 ]
 
 [package.dependencies]
@@ -871,6 +868,51 @@ files = [
     {file = "numpy-1.24.4.tar.gz", hash = "sha256:80f5e3a4e498641401868df4208b74581206afbee7cf7b8329daae82676d9463"},
 ]
 
+[[package]]
+name = "numpy"
+version = "1.26.4"
+description = "Fundamental package for array computing in Python"
+optional = false
+python-versions = ">=3.9"
+files = [
+    {file = "numpy-1.26.4-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:9ff0f4f29c51e2803569d7a51c2304de5554655a60c5d776e35b4a41413830d0"},
+    {file = "numpy-1.26.4-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:2e4ee3380d6de9c9ec04745830fd9e2eccb3e6cf790d39d7b98ffd19b0dd754a"},
+    {file = "numpy-1.26.4-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:d209d8969599b27ad20994c8e41936ee0964e6da07478d6c35016bc386b66ad4"},
+    {file = "numpy-1.26.4-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:ffa75af20b44f8dba823498024771d5ac50620e6915abac414251bd971b4529f"},
+    {file = "numpy-1.26.4-cp310-cp310-musllinux_1_1_aarch64.whl", hash = "sha256:62b8e4b1e28009ef2846b4c7852046736bab361f7aeadeb6a5b89ebec3c7055a"},
+    {file = "numpy-1.26.4-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:a4abb4f9001ad2858e7ac189089c42178fcce737e4169dc61321660f1a96c7d2"},
+    {file = "numpy-1.26.4-cp310-cp310-win32.whl", hash = "sha256:bfe25acf8b437eb2a8b2d49d443800a5f18508cd811fea3181723922a8a82b07"},
+    {file = "numpy-1.26.4-cp310-cp310-win_amd64.whl", hash = "sha256:b97fe8060236edf3662adfc2c633f56a08ae30560c56310562cb4f95500022d5"},
+    {file = "numpy-1.26.4-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:4c66707fabe114439db9068ee468c26bbdf909cac0fb58686a42a24de1760c71"},
+    {file = "numpy-1.26.4-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:edd8b5fe47dab091176d21bb6de568acdd906d1887a4584a15a9a96a1dca06ef"},
+    {file = "numpy-1.26.4-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:7ab55401287bfec946ced39700c053796e7cc0e3acbef09993a9ad2adba6ca6e"},
+    {file = "numpy-1.26.4-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:666dbfb6ec68962c033a450943ded891bed2d54e6755e35e5835d63f4f6931d5"},
+    {file = "numpy-1.26.4-cp311-cp311-musllinux_1_1_aarch64.whl", hash = "sha256:96ff0b2ad353d8f990b63294c8986f1ec3cb19d749234014f4e7eb0112ceba5a"},
+    {file = "numpy-1.26.4-cp311-cp311-musllinux_1_1_x86_64.whl", hash = "sha256:60dedbb91afcbfdc9bc0b1f3f402804070deed7392c23eb7a7f07fa857868e8a"},
+    {file = "numpy-1.26.4-cp311-cp311-win32.whl", hash = "sha256:1af303d6b2210eb850fcf03064d364652b7120803a0b872f5211f5234b399f20"},
+    {file = "numpy-1.26.4-cp311-cp311-win_amd64.whl", hash = "sha256:cd25bcecc4974d09257ffcd1f098ee778f7834c3ad767fe5db785be9a4aa9cb2"},
+    {file = "numpy-1.26.4-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:b3ce300f3644fb06443ee2222c2201dd3a89ea6040541412b8fa189341847218"},
+    {file = "numpy-1.26.4-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:03a8c78d01d9781b28a6989f6fa1bb2c4f2d51201cf99d3dd875df6fbd96b23b"},
+    {file = "numpy-1.26.4-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:9fad7dcb1aac3c7f0584a5a8133e3a43eeb2fe127f47e3632d43d677c66c102b"},
+    {file = "numpy-1.26.4-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:675d61ffbfa78604709862923189bad94014bef562cc35cf61d3a07bba02a7ed"},
+    {file = "numpy-1.26.4-cp312-cp312-musllinux_1_1_aarch64.whl", hash = "sha256:ab47dbe5cc8210f55aa58e4805fe224dac469cde56b9f731a4c098b91917159a"},
+    {file = "numpy-1.26.4-cp312-cp312-musllinux_1_1_x86_64.whl", hash = "sha256:1dda2e7b4ec9dd512f84935c5f126c8bd8b9f2fc001e9f54af255e8c5f16b0e0"},
+    {file = "numpy-1.26.4-cp312-cp312-win32.whl", hash = "sha256:50193e430acfc1346175fcbdaa28ffec49947a06918b7b92130744e81e640110"},
+    {file = "numpy-1.26.4-cp312-cp312-win_amd64.whl", hash = "sha256:08beddf13648eb95f8d867350f6a018a4be2e5ad54c8d8caed89ebca558b2818"},
+    {file = "numpy-1.26.4-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:7349ab0fa0c429c82442a27a9673fc802ffdb7c7775fad780226cb234965e53c"},
+    {file = "numpy-1.26.4-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:52b8b60467cd7dd1e9ed082188b4e6bb35aa5cdd01777621a1658910745b90be"},
+    {file = "numpy-1.26.4-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:d5241e0a80d808d70546c697135da2c613f30e28251ff8307eb72ba696945764"},
+    {file = "numpy-1.26.4-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:f870204a840a60da0b12273ef34f7051e98c3b5961b61b0c2c1be6dfd64fbcd3"},
+    {file = "numpy-1.26.4-cp39-cp39-musllinux_1_1_aarch64.whl", hash = "sha256:679b0076f67ecc0138fd2ede3a8fd196dddc2ad3254069bcb9faf9a79b1cebcd"},
+    {file = "numpy-1.26.4-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:47711010ad8555514b434df65f7d7b076bb8261df1ca9bb78f53d3b2db02e95c"},
+    {file = "numpy-1.26.4-cp39-cp39-win32.whl", hash = "sha256:a354325ee03388678242a4d7ebcd08b5c727033fcff3b2f536aea978e15ee9e6"},
+    {file = "numpy-1.26.4-cp39-cp39-win_amd64.whl", hash = "sha256:3373d5d70a5fe74a2c1bb6d2cfd9609ecf686d47a2d7b1d37a8f3b6bf6003aea"},
+    {file = "numpy-1.26.4-pp39-pypy39_pp73-macosx_10_9_x86_64.whl", hash = "sha256:afedb719a9dcfc7eaf2287b839d8198e06dcd4cb5d276a3df279231138e83d30"},
+    {file = "numpy-1.26.4-pp39-pypy39_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:95a7476c59002f2f6c590b9b7b998306fba6a5aa646b1e22ddfeaf8f78c3a29c"},
+    {file = "numpy-1.26.4-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:7e50d0a0cc3189f9cb0aeb3a6a6af18c16f59f004b866cd2be1c14b36134a4a0"},
+    {file = "numpy-1.26.4.tar.gz", hash = "sha256:2a02aba9ed12e4ac4eb3ea9421c420301a0c6460d9830d74a9df87efa4912010"},
+]
+
 [[package]]
 name = "openai"
 version = "1.30.1"
@@ -1679,4 +1721,4 @@ multidict = ">=4.0"
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.1,<4.0"
-content-hash = "e7b21f556475be4c7133b74b6b0e138012bef9d47bc5bdc9709b24e55d9500f0"
+content-hash = "8a868382f8f3b693dccc1ce99428cdf9d6f8b6f77b3403c342c2bcc7b8526db9"
diff --git a/libs/partners/together/pyproject.toml b/libs/partners/together/pyproject.toml
index ae6bd8c4ba..7e1ad59e52 100644
--- a/libs/partners/together/pyproject.toml
+++ b/libs/partners/together/pyproject.toml
@@ -43,6 +43,12 @@ codespell = "^2.2.0"
 optional = true
 
 [tool.poetry.group.test_integration.dependencies]
+# Support Python 3.8 and 3.12+.
+numpy = [
+    {version = "^1", python = "<3.12"},
+    {version = "^1.26.0", python = ">=3.12"}
+]
+
 
 [tool.poetry.group.lint]
 optional = true
diff --git a/libs/partners/together/tests/integration_tests/test_chat_models_standard.py b/libs/partners/together/tests/integration_tests/test_chat_models_standard.py
index 5c51ffe8fe..0150f12c1f 100644
--- a/libs/partners/together/tests/integration_tests/test_chat_models_standard.py
+++ b/libs/partners/together/tests/integration_tests/test_chat_models_standard.py
@@ -2,20 +2,17 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.integration_tests import ChatModelIntegrationTests
 
 from langchain_together import ChatTogether
 
 
-class TestTogethertandard(ChatModelIntegrationTests):
-    @pytest.fixture
+class TestTogetherStandard(ChatModelIntegrationTests):
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatTogether
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
-        return {
-            "model": "mistralai/Mistral-7B-Instruct-v0.1",
-        }
+        return {"model": "mistralai/Mistral-7B-Instruct-v0.1"}
diff --git a/libs/partners/together/tests/unit_tests/test_chat_models_standard.py b/libs/partners/together/tests/unit_tests/test_chat_models_standard.py
index 5ce9fea21e..824cde156c 100644
--- a/libs/partners/together/tests/unit_tests/test_chat_models_standard.py
+++ b/libs/partners/together/tests/unit_tests/test_chat_models_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
 
@@ -10,12 +9,10 @@ from langchain_together import ChatTogether
 
 
 class TestTogetherStandard(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatTogether
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
-        return {
-            "model": "meta-llama/Llama-3-8b-chat-hf",
-        }
+        return {"model": "meta-llama/Llama-3-8b-chat-hf"}
diff --git a/libs/partners/upstage/poetry.lock b/libs/partners/upstage/poetry.lock
index 79b75628aa..7fde6b0df6 100644
--- a/libs/partners/upstage/poetry.lock
+++ b/libs/partners/upstage/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.2 and should not be changed by hand.
 
 [[package]]
 name = "anyio"
@@ -340,7 +340,7 @@ files = [
 
 [[package]]
 name = "langchain-core"
-version = "0.2.4"
+version = "0.2.7"
 description = "Building applications with LLMs through composability"
 optional = false
 python-versions = ">=3.8.1,<4.0"
@@ -349,15 +349,12 @@ develop = true
 
 [package.dependencies]
 jsonpatch = "^1.33"
-langsmith = "^0.1.66"
-packaging = "^23.2"
+langsmith = "^0.1.75"
+packaging = ">=23.2,<25"
 pydantic = ">=1,<3"
 PyYAML = ">=5.3"
 tenacity = "^8.1.0"
 
-[package.extras]
-extended-testing = ["jinja2 (>=3,<4)"]
-
 [package.source]
 type = "directory"
 url = "../../core"
@@ -382,7 +379,7 @@ url = "../openai"
 
 [[package]]
 name = "langchain-standard-tests"
-version = "0.1.0"
+version = "0.1.1"
 description = "Standard tests for LangChain implementations"
 optional = false
 python-versions = ">=3.8.1,<4.0"
@@ -399,13 +396,13 @@ url = "../../standard-tests"
 
 [[package]]
 name = "langsmith"
-version = "0.1.69"
+version = "0.1.77"
 description = "Client library to connect to the LangSmith LLM Tracing and Evaluation Platform."
 optional = false
 python-versions = "<4.0,>=3.8.1"
 files = [
-    {file = "langsmith-0.1.69-py3-none-any.whl", hash = "sha256:3d7bd6fadb0852fc4cd2e7cf8a1593306046900052da3970bb2b48ed21cc73d8"},
-    {file = "langsmith-0.1.69.tar.gz", hash = "sha256:0146764904a8e479620b7e73efcba1cf172b621799564dd7e7342859c05c264a"},
+    {file = "langsmith-0.1.77-py3-none-any.whl", hash = "sha256:2202cc21b1ed7e7b9e5d2af2694be28898afa048c09fdf09f620cbd9301755ae"},
+    {file = "langsmith-0.1.77.tar.gz", hash = "sha256:4ace09077a9a4e412afeb4b517ca68e7de7b07f36e4792dc8236ac5207c0c0c7"},
 ]
 
 [package.dependencies]
@@ -546,6 +543,51 @@ files = [
     {file = "numpy-1.24.4.tar.gz", hash = "sha256:80f5e3a4e498641401868df4208b74581206afbee7cf7b8329daae82676d9463"},
 ]
 
+[[package]]
+name = "numpy"
+version = "1.26.4"
+description = "Fundamental package for array computing in Python"
+optional = false
+python-versions = ">=3.9"
+files = [
+    {file = "numpy-1.26.4-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:9ff0f4f29c51e2803569d7a51c2304de5554655a60c5d776e35b4a41413830d0"},
+    {file = "numpy-1.26.4-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:2e4ee3380d6de9c9ec04745830fd9e2eccb3e6cf790d39d7b98ffd19b0dd754a"},
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+    {file = "numpy-1.26.4.tar.gz", hash = "sha256:2a02aba9ed12e4ac4eb3ea9421c420301a0c6460d9830d74a9df87efa4912010"},
+]
+
 [[package]]
 name = "openai"
 version = "1.30.1"
@@ -725,26 +767,31 @@ python-versions = ">=3.8"
 files = [
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@@ -1304,4 +1352,4 @@ watchmedo = ["PyYAML (>=3.10)"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.1,<4.0"
-content-hash = "0073172ce2312055480e9ff47dc99ce7dfd6809208ad5ea4cee5ecf7f12eef56"
+content-hash = "b21648a1fdc08f901c82fb3b4773682f0a4b83b03b97ae1ddbd0834b730ff8c2"
diff --git a/libs/partners/upstage/pyproject.toml b/libs/partners/upstage/pyproject.toml
index 233584d838..f315da7fdf 100644
--- a/libs/partners/upstage/pyproject.toml
+++ b/libs/partners/upstage/pyproject.toml
@@ -43,6 +43,12 @@ codespell = "^2.2.0"
 optional = true
 
 [tool.poetry.group.test_integration.dependencies]
+# Support Python 3.8 and 3.12+.
+numpy = [
+    {version = "^1", python = "<3.12"},
+    {version = "^1.26.0", python = ">=3.12"}
+]
+
 
 [tool.poetry.group.lint]
 optional = true
diff --git a/libs/partners/upstage/tests/integration_tests/test_chat_models_standard.py b/libs/partners/upstage/tests/integration_tests/test_chat_models_standard.py
index ba06a00e34..0d1b29ec82 100644
--- a/libs/partners/upstage/tests/integration_tests/test_chat_models_standard.py
+++ b/libs/partners/upstage/tests/integration_tests/test_chat_models_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.integration_tests import ChatModelIntegrationTests
 
@@ -10,12 +9,10 @@ from langchain_upstage import ChatUpstage
 
 
 class TestUpstageStandard(ChatModelIntegrationTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatUpstage
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
-        return {
-            "model": "solar-1-mini-chat",
-        }
+        return {"model": "solar-1-mini-chat"}
diff --git a/libs/partners/upstage/tests/unit_tests/test_chat_models_standard.py b/libs/partners/upstage/tests/unit_tests/test_chat_models_standard.py
index b42053b224..91dcb760ad 100644
--- a/libs/partners/upstage/tests/unit_tests/test_chat_models_standard.py
+++ b/libs/partners/upstage/tests/unit_tests/test_chat_models_standard.py
@@ -2,7 +2,6 @@
 
 from typing import Type
 
-import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
 
@@ -10,12 +9,10 @@ from langchain_upstage import ChatUpstage
 
 
 class TestUpstageStandard(ChatModelUnitTests):
-    @pytest.fixture
+    @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatUpstage
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
-        return {
-            "model": "solar-1-mini-chat",
-        }
+        return {"model": "solar-1-mini-chat"}
diff --git a/libs/standard-tests/langchain_standard_tests/integration_tests/chat_models.py b/libs/standard-tests/langchain_standard_tests/integration_tests/chat_models.py
index 0dfc9a0481..78041da003 100644
--- a/libs/standard-tests/langchain_standard_tests/integration_tests/chat_models.py
+++ b/libs/standard-tests/langchain_standard_tests/integration_tests/chat_models.py
@@ -1,74 +1,31 @@
 import json
-from abc import ABC, abstractmethod
-from typing import Type
 
 import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_core.messages import AIMessage, AIMessageChunk, HumanMessage, ToolMessage
-from langchain_core.pydantic_v1 import BaseModel, Field
-from langchain_core.tools import tool
 
+from langchain_standard_tests.unit_tests.chat_models import (
+    ChatModelTests,
+    my_adder_tool,
+)
 
-class Person(BaseModel):
-    name: str = Field(..., description="The name of the person.")
-    age: int = Field(..., description="The age of the person.")
 
-
-@tool
-def my_adder_tool(a: int, b: int) -> int:
-    """Takes two integers, a and b, and returns their sum."""
-    return a + b
-
-
-class ChatModelIntegrationTests(ABC):
-    @abstractmethod
-    @pytest.fixture
-    def chat_model_class(self) -> Type[BaseChatModel]:
-        ...
-
-    @pytest.fixture
-    def chat_model_params(self) -> dict:
-        return {}
-
-    @pytest.fixture
-    def chat_model_has_tool_calling(
-        self, chat_model_class: Type[BaseChatModel]
-    ) -> bool:
-        return chat_model_class.bind_tools is not BaseChatModel.bind_tools
-
-    @pytest.fixture
-    def chat_model_has_structured_output(
-        self, chat_model_class: Type[BaseChatModel]
-    ) -> bool:
-        return (
-            chat_model_class.with_structured_output
-            is not BaseChatModel.with_structured_output
-        )
-
-    def test_invoke(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+class ChatModelIntegrationTests(ChatModelTests):
+    def test_invoke(self, model: BaseChatModel) -> None:
         result = model.invoke("Hello")
         assert result is not None
         assert isinstance(result, AIMessage)
         assert isinstance(result.content, str)
         assert len(result.content) > 0
 
-    async def test_ainvoke(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+    async def test_ainvoke(self, model: BaseChatModel) -> None:
         result = await model.ainvoke("Hello")
         assert result is not None
         assert isinstance(result, AIMessage)
         assert isinstance(result.content, str)
         assert len(result.content) > 0
 
-    def test_stream(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+    def test_stream(self, model: BaseChatModel) -> None:
         num_tokens = 0
         for token in model.stream("Hello"):
             assert token is not None
@@ -76,10 +33,7 @@ class ChatModelIntegrationTests(ABC):
             num_tokens += len(token.content)
         assert num_tokens > 0
 
-    async def test_astream(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+    async def test_astream(self, model: BaseChatModel) -> None:
         num_tokens = 0
         async for token in model.astream("Hello"):
             assert token is not None
@@ -87,10 +41,7 @@ class ChatModelIntegrationTests(ABC):
             num_tokens += len(token.content)
         assert num_tokens > 0
 
-    def test_batch(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+    def test_batch(self, model: BaseChatModel) -> None:
         batch_results = model.batch(["Hello", "Hey"])
         assert batch_results is not None
         assert isinstance(batch_results, list)
@@ -101,10 +52,7 @@ class ChatModelIntegrationTests(ABC):
             assert isinstance(result.content, str)
             assert len(result.content) > 0
 
-    async def test_abatch(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+    async def test_abatch(self, model: BaseChatModel) -> None:
         batch_results = await model.abatch(["Hello", "Hey"])
         assert batch_results is not None
         assert isinstance(batch_results, list)
@@ -115,14 +63,11 @@ class ChatModelIntegrationTests(ABC):
             assert isinstance(result.content, str)
             assert len(result.content) > 0
 
-    def test_conversation(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+    def test_conversation(self, model: BaseChatModel) -> None:
         messages = [
-            HumanMessage(content="hello"),
-            AIMessage(content="hello"),
-            HumanMessage(content="how are you"),
+            HumanMessage("hello"),
+            AIMessage("hello"),
+            HumanMessage("how are you"),
         ]
         result = model.invoke(messages)
         assert result is not None
@@ -130,10 +75,9 @@ class ChatModelIntegrationTests(ABC):
         assert isinstance(result.content, str)
         assert len(result.content) > 0
 
-    def test_usage_metadata(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+    def test_usage_metadata(self, model: BaseChatModel) -> None:
+        if not self.returns_usage_metadata:
+            pytest.skip("Not implemented.")
         result = model.invoke("Hello")
         assert result is not None
         assert isinstance(result, AIMessage)
@@ -142,39 +86,35 @@ class ChatModelIntegrationTests(ABC):
         assert isinstance(result.usage_metadata["output_tokens"], int)
         assert isinstance(result.usage_metadata["total_tokens"], int)
 
-    def test_stop_sequence(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
+    def test_stop_sequence(self, model: BaseChatModel) -> None:
         result = model.invoke("hi", stop=["you"])
         assert isinstance(result, AIMessage)
 
-        model = chat_model_class(**chat_model_params, stop=["you"])
-        result = model.invoke("hi")
+        custom_model = self.chat_model_class(
+            **{**self.chat_model_params, "stop": ["you"]}
+        )
+        result = custom_model.invoke("hi")
         assert isinstance(result, AIMessage)
 
     def test_tool_message_histories_string_content(
         self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-        chat_model_has_tool_calling: bool,
+        model: BaseChatModel,
     ) -> None:
         """
         Test that message histories are compatible with string tool contents
         (e.g. OpenAI).
         """
-        if not chat_model_has_tool_calling:
+        if not self.has_tool_calling:
             pytest.skip("Test requires tool calling.")
-        model = chat_model_class(**chat_model_params)
         model_with_tools = model.bind_tools([my_adder_tool])
         function_name = "my_adder_tool"
         function_args = {"a": "1", "b": "2"}
 
         messages_string_content = [
-            HumanMessage(content="What is 1 + 2"),
+            HumanMessage("What is 1 + 2"),
             # string content (e.g. OpenAI)
             AIMessage(
-                content="",
+                "",
                 tool_calls=[
                     {
                         "name": function_name,
@@ -184,8 +124,8 @@ class ChatModelIntegrationTests(ABC):
                 ],
             ),
             ToolMessage(
+                json.dumps({"result": 3}),
                 name=function_name,
-                content=json.dumps({"result": 3}),
                 tool_call_id="abc123",
             ),
         ]
@@ -194,26 +134,23 @@ class ChatModelIntegrationTests(ABC):
 
     def test_tool_message_histories_list_content(
         self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-        chat_model_has_tool_calling: bool,
+        model: BaseChatModel,
     ) -> None:
         """
         Test that message histories are compatible with list tool contents
         (e.g. Anthropic).
         """
-        if not chat_model_has_tool_calling:
+        if not self.has_tool_calling:
             pytest.skip("Test requires tool calling.")
-        model = chat_model_class(**chat_model_params)
         model_with_tools = model.bind_tools([my_adder_tool])
         function_name = "my_adder_tool"
         function_args = {"a": 1, "b": 2}
 
         messages_list_content = [
-            HumanMessage(content="What is 1 + 2"),
+            HumanMessage("What is 1 + 2"),
             # List content (e.g., Anthropic)
             AIMessage(
-                content=[
+                [
                     {"type": "text", "text": "some text"},
                     {
                         "type": "tool_use",
@@ -231,8 +168,8 @@ class ChatModelIntegrationTests(ABC):
                 ],
             ),
             ToolMessage(
+                json.dumps({"result": 3}),
                 name=function_name,
-                content=json.dumps({"result": 3}),
                 tool_call_id="abc123",
             ),
         ]
@@ -241,25 +178,22 @@ class ChatModelIntegrationTests(ABC):
 
     def test_structured_few_shot_examples(
         self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-        chat_model_has_tool_calling: bool,
+        model: BaseChatModel,
     ) -> None:
         """
         Test that model can process few-shot examples with tool calls.
         """
-        if not chat_model_has_tool_calling:
+        if not self.has_tool_calling:
             pytest.skip("Test requires tool calling.")
-        model = chat_model_class(**chat_model_params)
-        model_with_tools = model.bind_tools([my_adder_tool])
+        model_with_tools = model.bind_tools([my_adder_tool], tool_choice="any")
         function_name = "my_adder_tool"
         function_args = {"a": 1, "b": 2}
         function_result = json.dumps({"result": 3})
 
         messages_string_content = [
-            HumanMessage(content="What is 1 + 2"),
+            HumanMessage("What is 1 + 2"),
             AIMessage(
-                content="",
+                "",
                 tool_calls=[
                     {
                         "name": function_name,
@@ -269,12 +203,12 @@ class ChatModelIntegrationTests(ABC):
                 ],
             ),
             ToolMessage(
+                function_result,
                 name=function_name,
-                content=function_result,
                 tool_call_id="abc123",
             ),
-            AIMessage(content=function_result),
-            HumanMessage(content="What is 3 + 4"),
+            AIMessage(function_result),
+            HumanMessage("What is 3 + 4"),
         ]
         result_string_content = model_with_tools.invoke(messages_string_content)
         assert isinstance(result_string_content, AIMessage)
diff --git a/libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py b/libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py
index a3e71411b0..89d069c203 100644
--- a/libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py
+++ b/libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py
@@ -1,13 +1,16 @@
 from abc import ABC, abstractmethod
-from typing import List, Literal, Optional, Type
+from typing import Any, List, Literal, Optional, Type
 
 import pytest
 from langchain_core.language_models import BaseChatModel
 from langchain_core.pydantic_v1 import BaseModel, Field, ValidationError
+from langchain_core.runnables import RunnableBinding
 from langchain_core.tools import tool
 
 
 class Person(BaseModel):
+    """Record attributes of a person."""
+
     name: str = Field(..., description="The name of the person.")
     age: int = Field(..., description="The age of the person.")
 
@@ -18,81 +21,105 @@ def my_adder_tool(a: int, b: int) -> int:
     return a + b
 
 
-class ChatModelUnitTests(ABC):
+class ChatModelTests(ABC):
+    @property
     @abstractmethod
-    @pytest.fixture
     def chat_model_class(self) -> Type[BaseChatModel]:
         ...
 
-    @pytest.fixture
+    @property
     def chat_model_params(self) -> dict:
         return {}
 
-    @pytest.fixture
-    def chat_model_has_tool_calling(
-        self, chat_model_class: Type[BaseChatModel]
-    ) -> bool:
-        return chat_model_class.bind_tools is not BaseChatModel.bind_tools
+    @property
+    def standard_chat_model_params(self) -> dict:
+        return {
+            "temperature": 0,
+            "max_tokens": 100,
+            "timeout": 60,
+            "stop_sequences": [],
+            "max_retries": 2,
+        }
 
     @pytest.fixture
-    def chat_model_has_structured_output(
-        self, chat_model_class: Type[BaseChatModel]
-    ) -> bool:
+    def model(self) -> BaseChatModel:
+        return self.chat_model_class(
+            **{**self.standard_chat_model_params, **self.chat_model_params}
+        )
+
+    @property
+    def has_tool_calling(self) -> bool:
+        return self.chat_model_class.bind_tools is not BaseChatModel.bind_tools
+
+    @property
+    def has_structured_output(self) -> bool:
         return (
-            chat_model_class.with_structured_output
+            self.chat_model_class.with_structured_output
             is not BaseChatModel.with_structured_output
         )
 
-    def test_chat_model_init(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        model = chat_model_class(**chat_model_params)
-        assert model is not None
+    @property
+    def supports_image_inputs(self) -> bool:
+        return False
 
-    def test_chat_model_init_api_key(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
-        params = {**chat_model_params, "api_key": "test"}
-        model = chat_model_class(**params)  # type: ignore
+    @property
+    def supports_video_inputs(self) -> bool:
+        return False
+
+    @property
+    def returns_usage_metadata(self) -> bool:
+        return True
+
+
+class ChatModelUnitTests(ChatModelTests):
+    @property
+    def standard_chat_model_params(self) -> dict:
+        params = super().standard_chat_model_params
+        params["api_key"] = "test"
+        return params
+
+    def test_init(self) -> None:
+        model = self.chat_model_class(
+            **{**self.standard_chat_model_params, **self.chat_model_params}
+        )
         assert model is not None
 
-    def test_chat_model_init_streaming(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
+    def test_init_streaming(
+        self,
     ) -> None:
-        model = chat_model_class(streaming=True, **chat_model_params)  # type: ignore
+        model = self.chat_model_class(
+            **{
+                **self.standard_chat_model_params,
+                **self.chat_model_params,
+                "streaming": True,
+            }
+        )
         assert model is not None
 
-    def test_chat_model_bind_tool_pydantic(
+    def test_bind_tool_pydantic(
         self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-        chat_model_has_tool_calling: bool,
+        model: BaseChatModel,
     ) -> None:
-        if not chat_model_has_tool_calling:
+        if not self.has_tool_calling:
             return
 
-        model = chat_model_class(**chat_model_params)
-
-        assert hasattr(model, "bind_tools")
-        tool_model = model.bind_tools([Person])
-        assert tool_model is not None
+        tool_model = model.bind_tools(
+            [Person, Person.schema(), my_adder_tool], tool_choice="any"
+        )
+        assert isinstance(tool_model, RunnableBinding)
 
-    def test_chat_model_with_structured_output(
+    @pytest.mark.parametrize("schema", [Person, Person.schema()])
+    def test_with_structured_output(
         self,
-        chat_model_class: Type[BaseChatModel],
-        chat_model_params: dict,
-        chat_model_has_structured_output: bool,
+        model: BaseChatModel,
+        schema: Any,
     ) -> None:
-        if not chat_model_has_structured_output:
+        if not self.has_structured_output:
             return
 
-        model = chat_model_class(**chat_model_params)
-        assert model is not None
-        assert model.with_structured_output(Person) is not None
+        assert model.with_structured_output(schema) is not None
 
-    def test_standard_params(
-        self, chat_model_class: Type[BaseChatModel], chat_model_params: dict
-    ) -> None:
+    def test_standard_params(self, model: BaseChatModel) -> None:
         class ExpectedParams(BaseModel):
             ls_provider: str
             ls_model_name: str
@@ -101,7 +128,6 @@ class ChatModelUnitTests(ABC):
             ls_max_tokens: Optional[int]
             ls_stop: Optional[List[str]]
 
-        model = chat_model_class(**chat_model_params)
         ls_params = model._get_ls_params()
         try:
             ExpectedParams(**ls_params)
@@ -109,7 +135,9 @@ class ChatModelUnitTests(ABC):
             pytest.fail(f"Validation error: {e}")
 
         # Test optional params
-        model = chat_model_class(max_tokens=10, stop=["test"], **chat_model_params)
+        model = self.chat_model_class(
+            max_tokens=10, stop=["test"], **self.chat_model_params
+        )
         ls_params = model._get_ls_params()
         try:
             ExpectedParams(**ls_params)