diff --git a/libs/partners/openai/langchain_openai/chat_models/base.py b/libs/partners/openai/langchain_openai/chat_models/base.py
index b5b7199edb..ed33b919bd 100644
--- a/libs/partners/openai/langchain_openai/chat_models/base.py
+++ b/libs/partners/openai/langchain_openai/chat_models/base.py
@@ -572,19 +572,9 @@ class ChatOpenAI(BaseChatModel):
             model = self.tiktoken_model_name
         else:
             model = self.model_name
-            if model == "gpt-3.5-turbo":
-                # gpt-3.5-turbo may change over time.
-                # Returning num tokens assuming gpt-3.5-turbo-0301.
-                model = "gpt-3.5-turbo-0301"
-            elif model == "gpt-4":
-                # gpt-4 may change over time.
-                # Returning num tokens assuming gpt-4-0314.
-                model = "gpt-4-0314"
-        # Returns the number of tokens used by a list of messages.
         try:
             encoding = tiktoken.encoding_for_model(model)
         except KeyError:
-            logger.warning("Warning: model not found. Using cl100k_base encoding.")
             model = "cl100k_base"
             encoding = tiktoken.get_encoding(model)
         return model, encoding
diff --git a/libs/partners/openai/langchain_openai/embeddings/base.py b/libs/partners/openai/langchain_openai/embeddings/base.py
index cd0987ea43..d0b815358e 100644
--- a/libs/partners/openai/langchain_openai/embeddings/base.py
+++ b/libs/partners/openai/langchain_openai/embeddings/base.py
@@ -289,9 +289,7 @@ class OpenAIEmbeddings(BaseModel, Embeddings):
             try:
                 encoding = tiktoken.encoding_for_model(model_name)
             except KeyError:
-                logger.warning("Warning: model not found. Using cl100k_base encoding.")
-                model = "cl100k_base"
-                encoding = tiktoken.get_encoding(model)
+                encoding = tiktoken.get_encoding("cl100k_base")
             for i, text in enumerate(texts):
                 if self.model.endswith("001"):
                     # See: https://github.com/openai/openai-python/
diff --git a/libs/partners/openai/langchain_openai/llms/base.py b/libs/partners/openai/langchain_openai/llms/base.py
index 27c2afd5ee..9b0ba87d1f 100644
--- a/libs/partners/openai/langchain_openai/llms/base.py
+++ b/libs/partners/openai/langchain_openai/llms/base.py
@@ -496,9 +496,7 @@ class BaseOpenAI(BaseLLM):
         try:
             enc = tiktoken.encoding_for_model(model_name)
         except KeyError:
-            logger.warning("Warning: model not found. Using cl100k_base encoding.")
-            model = "cl100k_base"
-            enc = tiktoken.get_encoding(model)
+            enc = tiktoken.get_encoding("cl100k_base")
 
         return enc.encode(
             text,
diff --git a/libs/partners/openai/tests/unit_tests/chat_models/test_base.py b/libs/partners/openai/tests/unit_tests/chat_models/test_base.py
index 767ce0720c..b729664e6b 100644
--- a/libs/partners/openai/tests/unit_tests/chat_models/test_base.py
+++ b/libs/partners/openai/tests/unit_tests/chat_models/test_base.py
@@ -118,3 +118,19 @@ async def test_openai_apredict(mock_completion: dict) -> None:
         res = llm.predict("bar")
         assert res == "Bar Baz"
     assert completed
+
+
+@pytest.mark.parametrize(
+    "model",
+    [
+        "gpt-3.5-turbo",
+        "gpt-4",
+        "gpt-3.5-0125",
+        "gpt-4-0125-preview",
+        "gpt-4-turbo-preview",
+        "gpt-4-vision-preview",
+    ],
+)
+def test__get_encoding_model(model: str) -> None:
+    ChatOpenAI(model=model)._get_encoding_model()
+    return
diff --git a/libs/partners/openai/tests/unit_tests/llms/test_base.py b/libs/partners/openai/tests/unit_tests/llms/test_base.py
index ebcd420995..d05bb0bfe5 100644
--- a/libs/partners/openai/tests/unit_tests/llms/test_base.py
+++ b/libs/partners/openai/tests/unit_tests/llms/test_base.py
@@ -7,7 +7,6 @@ from langchain_openai import OpenAI
 os.environ["OPENAI_API_KEY"] = "foo"
 
 
-@pytest.mark.requires("openai")
 def test_openai_model_param() -> None:
     llm = OpenAI(model="foo")
     assert llm.model_name == "foo"
@@ -15,19 +14,16 @@ def test_openai_model_param() -> None:
     assert llm.model_name == "foo"
 
 
-@pytest.mark.requires("openai")
 def test_openai_model_kwargs() -> None:
     llm = OpenAI(model_kwargs={"foo": "bar"})
     assert llm.model_kwargs == {"foo": "bar"}
 
 
-@pytest.mark.requires("openai")
 def test_openai_invalid_model_kwargs() -> None:
     with pytest.raises(ValueError):
         OpenAI(model_kwargs={"model_name": "foo"})
 
 
-@pytest.mark.requires("openai")
 def test_openai_incorrect_field() -> None:
     with pytest.warns(match="not default parameter"):
         llm = OpenAI(foo="bar")
@@ -46,3 +42,15 @@ def mock_completion() -> dict:
         ],
         "usage": {"prompt_tokens": 1, "completion_tokens": 2, "total_tokens": 3},
     }
+
+
+@pytest.mark.parametrize(
+    "model",
+    [
+        "gpt-3.5-turbo-instruct",
+        "text-davinci-003",
+    ],
+)
+def test_get_token_ids(model: str) -> None:
+    OpenAI(model=model).get_token_ids("foo")
+    return