diff --git a/langchain/chains/api/base.py b/langchain/chains/api/base.py
index 5036a72c..5cbded4e 100644
--- a/langchain/chains/api/base.py
+++ b/langchain/chains/api/base.py
@@ -8,9 +8,9 @@ from pydantic import BaseModel, Field, root_validator
 from langchain.chains.api.prompt import API_RESPONSE_PROMPT, API_URL_PROMPT
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
-from langchain.llms.base import BaseLLM
 from langchain.prompts import BasePromptTemplate
 from langchain.requests import RequestsWrapper
+from langchain.schema import BaseLanguageModel
 
 
 class APIChain(Chain, BaseModel):
@@ -84,7 +84,7 @@ class APIChain(Chain, BaseModel):
     @classmethod
     def from_llm_and_api_docs(
         cls,
-        llm: BaseLLM,
+        llm: BaseLanguageModel,
         api_docs: str,
         headers: Optional[dict] = None,
         api_url_prompt: BasePromptTemplate = API_URL_PROMPT,
diff --git a/langchain/chains/constitutional_ai/base.py b/langchain/chains/constitutional_ai/base.py
index b68e22de..b78aa3a0 100644
--- a/langchain/chains/constitutional_ai/base.py
+++ b/langchain/chains/constitutional_ai/base.py
@@ -5,8 +5,8 @@ from langchain.chains.base import Chain
 from langchain.chains.constitutional_ai.models import ConstitutionalPrinciple
 from langchain.chains.constitutional_ai.prompts import CRITIQUE_PROMPT, REVISION_PROMPT
 from langchain.chains.llm import LLMChain
-from langchain.llms.base import BaseLLM
 from langchain.prompts.base import BasePromptTemplate
+from langchain.schema import BaseLanguageModel
 
 
 class ConstitutionalChain(Chain):
@@ -45,7 +45,7 @@ class ConstitutionalChain(Chain):
     @classmethod
     def from_llm(
         cls,
-        llm: BaseLLM,
+        llm: BaseLanguageModel,
         chain: LLMChain,
         critique_prompt: BasePromptTemplate = CRITIQUE_PROMPT,
         revision_prompt: BasePromptTemplate = REVISION_PROMPT,
diff --git a/langchain/chains/llm_bash/base.py b/langchain/chains/llm_bash/base.py
index 5a0d88eb..994df302 100644
--- a/langchain/chains/llm_bash/base.py
+++ b/langchain/chains/llm_bash/base.py
@@ -6,8 +6,8 @@ from pydantic import BaseModel, Extra
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.llm_bash.prompt import PROMPT
-from langchain.llms.base import BaseLLM
 from langchain.prompts.base import BasePromptTemplate
+from langchain.schema import BaseLanguageModel
 from langchain.utilities.bash import BashProcess
 
 
@@ -21,7 +21,7 @@ class LLMBashChain(Chain, BaseModel):
             llm_bash = LLMBashChain(llm=OpenAI())
     """
 
-    llm: BaseLLM
+    llm: BaseLanguageModel
     """LLM wrapper to use."""
     input_key: str = "question"  #: :meta private:
     output_key: str = "answer"  #: :meta private:
diff --git a/langchain/chains/pal/base.py b/langchain/chains/pal/base.py
index 5f574aaa..443dd137 100644
--- a/langchain/chains/pal/base.py
+++ b/langchain/chains/pal/base.py
@@ -12,15 +12,15 @@ from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.pal.colored_object_prompt import COLORED_OBJECT_PROMPT
 from langchain.chains.pal.math_prompt import MATH_PROMPT
-from langchain.llms.base import BaseLLM
 from langchain.prompts.base import BasePromptTemplate
 from langchain.python import PythonREPL
+from langchain.schema import BaseLanguageModel
 
 
 class PALChain(Chain, BaseModel):
     """Implements Program-Aided Language Models."""
 
-    llm: BaseLLM
+    llm: BaseLanguageModel
     prompt: BasePromptTemplate
     stop: str = "\n\n"
     get_answer_expr: str = "print(solution())"
@@ -68,7 +68,7 @@ class PALChain(Chain, BaseModel):
         return output
 
     @classmethod
-    def from_math_prompt(cls, llm: BaseLLM, **kwargs: Any) -> PALChain:
+    def from_math_prompt(cls, llm: BaseLanguageModel, **kwargs: Any) -> PALChain:
         """Load PAL from math prompt."""
         return cls(
             llm=llm,
@@ -79,7 +79,9 @@ class PALChain(Chain, BaseModel):
         )
 
     @classmethod
-    def from_colored_object_prompt(cls, llm: BaseLLM, **kwargs: Any) -> PALChain:
+    def from_colored_object_prompt(
+        cls, llm: BaseLanguageModel, **kwargs: Any
+    ) -> PALChain:
         """Load PAL from colored object prompt."""
         return cls(
             llm=llm,
diff --git a/langchain/chains/qa_with_sources/base.py b/langchain/chains/qa_with_sources/base.py
index 3cc15147..628a7b36 100644
--- a/langchain/chains/qa_with_sources/base.py
+++ b/langchain/chains/qa_with_sources/base.py
@@ -19,8 +19,8 @@ from langchain.chains.qa_with_sources.map_reduce_prompt import (
     QUESTION_PROMPT,
 )
 from langchain.docstore.document import Document
-from langchain.llms.base import BaseLLM
 from langchain.prompts.base import BasePromptTemplate
+from langchain.schema import BaseLanguageModel
 
 
 class BaseQAWithSourcesChain(Chain, BaseModel, ABC):
@@ -38,7 +38,7 @@ class BaseQAWithSourcesChain(Chain, BaseModel, ABC):
     @classmethod
     def from_llm(
         cls,
-        llm: BaseLLM,
+        llm: BaseLanguageModel,
         document_prompt: BasePromptTemplate = EXAMPLE_PROMPT,
         question_prompt: BasePromptTemplate = QUESTION_PROMPT,
         combine_prompt: BasePromptTemplate = COMBINE_PROMPT,
@@ -65,7 +65,7 @@ class BaseQAWithSourcesChain(Chain, BaseModel, ABC):
     @classmethod
     def from_chain_type(
         cls,
-        llm: BaseLLM,
+        llm: BaseLanguageModel,
         chain_type: str = "stuff",
         chain_type_kwargs: Optional[dict] = None,
         **kwargs: Any,
diff --git a/langchain/chains/qa_with_sources/loading.py b/langchain/chains/qa_with_sources/loading.py
index 4af17329..c1d923ae 100644
--- a/langchain/chains/qa_with_sources/loading.py
+++ b/langchain/chains/qa_with_sources/loading.py
@@ -13,19 +13,21 @@ from langchain.chains.qa_with_sources import (
     stuff_prompt,
 )
 from langchain.chains.question_answering import map_rerank_prompt
-from langchain.llms.base import BaseLLM
 from langchain.prompts.base import BasePromptTemplate
+from langchain.schema import BaseLanguageModel
 
 
 class LoadingCallable(Protocol):
     """Interface for loading the combine documents chain."""
 
-    def __call__(self, llm: BaseLLM, **kwargs: Any) -> BaseCombineDocumentsChain:
+    def __call__(
+        self, llm: BaseLanguageModel, **kwargs: Any
+    ) -> BaseCombineDocumentsChain:
         """Callable to load the combine documents chain."""
 
 
 def _load_map_rerank_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     prompt: BasePromptTemplate = map_rerank_prompt.PROMPT,
     verbose: bool = False,
     document_variable_name: str = "context",
@@ -44,7 +46,7 @@ def _load_map_rerank_chain(
 
 
 def _load_stuff_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     prompt: BasePromptTemplate = stuff_prompt.PROMPT,
     document_prompt: BasePromptTemplate = stuff_prompt.EXAMPLE_PROMPT,
     document_variable_name: str = "summaries",
@@ -62,15 +64,15 @@ def _load_stuff_chain(
 
 
 def _load_map_reduce_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     question_prompt: BasePromptTemplate = map_reduce_prompt.QUESTION_PROMPT,
     combine_prompt: BasePromptTemplate = map_reduce_prompt.COMBINE_PROMPT,
     document_prompt: BasePromptTemplate = map_reduce_prompt.EXAMPLE_PROMPT,
     combine_document_variable_name: str = "summaries",
     map_reduce_document_variable_name: str = "context",
     collapse_prompt: Optional[BasePromptTemplate] = None,
-    reduce_llm: Optional[BaseLLM] = None,
-    collapse_llm: Optional[BaseLLM] = None,
+    reduce_llm: Optional[BaseLanguageModel] = None,
+    collapse_llm: Optional[BaseLanguageModel] = None,
     verbose: Optional[bool] = None,
     **kwargs: Any,
 ) -> MapReduceDocumentsChain:
@@ -112,13 +114,13 @@ def _load_map_reduce_chain(
 
 
 def _load_refine_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     question_prompt: BasePromptTemplate = refine_prompts.DEFAULT_TEXT_QA_PROMPT,
     refine_prompt: BasePromptTemplate = refine_prompts.DEFAULT_REFINE_PROMPT,
     document_prompt: BasePromptTemplate = refine_prompts.EXAMPLE_PROMPT,
     document_variable_name: str = "context_str",
     initial_response_name: str = "existing_answer",
-    refine_llm: Optional[BaseLLM] = None,
+    refine_llm: Optional[BaseLanguageModel] = None,
     verbose: Optional[bool] = None,
     **kwargs: Any,
 ) -> RefineDocumentsChain:
@@ -137,7 +139,7 @@ def _load_refine_chain(
 
 
 def load_qa_with_sources_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     chain_type: str = "stuff",
     verbose: Optional[bool] = None,
     **kwargs: Any,
diff --git a/langchain/chains/sql_database/base.py b/langchain/chains/sql_database/base.py
index 37a3bd17..6f959014 100644
--- a/langchain/chains/sql_database/base.py
+++ b/langchain/chains/sql_database/base.py
@@ -8,8 +8,8 @@ from pydantic import BaseModel, Extra, Field
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.sql_database.prompt import DECIDER_PROMPT, PROMPT
-from langchain.llms.base import BaseLLM
 from langchain.prompts.base import BasePromptTemplate
+from langchain.schema import BaseLanguageModel
 from langchain.sql_database import SQLDatabase
 
 
@@ -24,7 +24,7 @@ class SQLDatabaseChain(Chain, BaseModel):
             db_chain = SQLDatabaseChain(llm=OpenAI(), database=db)
     """
 
-    llm: BaseLLM
+    llm: BaseLanguageModel
     """LLM wrapper to use."""
     database: SQLDatabase = Field(exclude=True)
     """SQL Database to connect to."""
@@ -122,7 +122,7 @@ class SQLDatabaseSequentialChain(Chain, BaseModel):
     @classmethod
     def from_llm(
         cls,
-        llm: BaseLLM,
+        llm: BaseLanguageModel,
         database: SQLDatabase,
         query_prompt: BasePromptTemplate = PROMPT,
         decider_prompt: BasePromptTemplate = DECIDER_PROMPT,
diff --git a/langchain/chains/summarize/__init__.py b/langchain/chains/summarize/__init__.py
index c6446f68..c31fda47 100644
--- a/langchain/chains/summarize/__init__.py
+++ b/langchain/chains/summarize/__init__.py
@@ -7,19 +7,21 @@ from langchain.chains.combine_documents.refine import RefineDocumentsChain
 from langchain.chains.combine_documents.stuff import StuffDocumentsChain
 from langchain.chains.llm import LLMChain
 from langchain.chains.summarize import map_reduce_prompt, refine_prompts, stuff_prompt
-from langchain.llms.base import BaseLLM
 from langchain.prompts.base import BasePromptTemplate
+from langchain.schema import BaseLanguageModel
 
 
 class LoadingCallable(Protocol):
     """Interface for loading the combine documents chain."""
 
-    def __call__(self, llm: BaseLLM, **kwargs: Any) -> BaseCombineDocumentsChain:
+    def __call__(
+        self, llm: BaseLanguageModel, **kwargs: Any
+    ) -> BaseCombineDocumentsChain:
         """Callable to load the combine documents chain."""
 
 
 def _load_stuff_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     prompt: BasePromptTemplate = stuff_prompt.PROMPT,
     document_variable_name: str = "text",
     verbose: Optional[bool] = None,
@@ -36,14 +38,14 @@ def _load_stuff_chain(
 
 
 def _load_map_reduce_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     map_prompt: BasePromptTemplate = map_reduce_prompt.PROMPT,
     combine_prompt: BasePromptTemplate = map_reduce_prompt.PROMPT,
     combine_document_variable_name: str = "text",
     map_reduce_document_variable_name: str = "text",
     collapse_prompt: Optional[BasePromptTemplate] = None,
-    reduce_llm: Optional[BaseLLM] = None,
-    collapse_llm: Optional[BaseLLM] = None,
+    reduce_llm: Optional[BaseLanguageModel] = None,
+    collapse_llm: Optional[BaseLanguageModel] = None,
     verbose: Optional[bool] = None,
     **kwargs: Any,
 ) -> MapReduceDocumentsChain:
@@ -84,12 +86,12 @@ def _load_map_reduce_chain(
 
 
 def _load_refine_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     question_prompt: BasePromptTemplate = refine_prompts.PROMPT,
     refine_prompt: BasePromptTemplate = refine_prompts.REFINE_PROMPT,
     document_variable_name: str = "text",
     initial_response_name: str = "existing_answer",
-    refine_llm: Optional[BaseLLM] = None,
+    refine_llm: Optional[BaseLanguageModel] = None,
     verbose: Optional[bool] = None,
     **kwargs: Any,
 ) -> RefineDocumentsChain:
@@ -107,7 +109,7 @@ def _load_refine_chain(
 
 
 def load_summarize_chain(
-    llm: BaseLLM,
+    llm: BaseLanguageModel,
     chain_type: str = "stuff",
     verbose: Optional[bool] = None,
     **kwargs: Any,
diff --git a/langchain/chains/vector_db_qa/base.py b/langchain/chains/vector_db_qa/base.py
index 3da04659..16182b78 100644
--- a/langchain/chains/vector_db_qa/base.py
+++ b/langchain/chains/vector_db_qa/base.py
@@ -11,8 +11,8 @@ from langchain.chains.combine_documents.stuff import StuffDocumentsChain
 from langchain.chains.llm import LLMChain
 from langchain.chains.question_answering import load_qa_chain
 from langchain.chains.question_answering.stuff_prompt import PROMPT_SELECTOR
-from langchain.llms.base import BaseLLM
 from langchain.prompts import PromptTemplate
+from langchain.schema import BaseLanguageModel
 from langchain.vectorstores.base import VectorStore
 
 
@@ -103,7 +103,10 @@ class VectorDBQA(Chain, BaseModel):
 
     @classmethod
     def from_llm(
-        cls, llm: BaseLLM, prompt: Optional[PromptTemplate] = None, **kwargs: Any
+        cls,
+        llm: BaseLanguageModel,
+        prompt: Optional[PromptTemplate] = None,
+        **kwargs: Any,
     ) -> VectorDBQA:
         """Initialize from LLM."""
         _prompt = prompt or PROMPT_SELECTOR.get_prompt(llm)
@@ -122,7 +125,7 @@ class VectorDBQA(Chain, BaseModel):
     @classmethod
     def from_chain_type(
         cls,
-        llm: BaseLLM,
+        llm: BaseLanguageModel,
         chain_type: str = "stuff",
         chain_type_kwargs: Optional[dict] = None,
         **kwargs: Any,