diff --git a/libs/core/langchain_core/language_models/base.py b/libs/core/langchain_core/language_models/base.py
index b590e0df84..ef9d129967 100644
--- a/libs/core/langchain_core/language_models/base.py
+++ b/libs/core/langchain_core/language_models/base.py
@@ -48,7 +48,7 @@ def _get_token_ids_default_method(text: str) -> List[int]:
     return tokenizer.encode(text)
 
 
-LanguageModelInput = Union[PromptValue, str, List[BaseMessage]]
+LanguageModelInput = Union[PromptValue, str, Sequence[BaseMessage]]
 LanguageModelOutput = Union[BaseMessage, str]
 LanguageModelLike = Runnable[LanguageModelInput, LanguageModelOutput]
 LanguageModelOutputVar = TypeVar("LanguageModelOutputVar", BaseMessage, str)
diff --git a/libs/core/langchain_core/language_models/chat_models.py b/libs/core/langchain_core/language_models/chat_models.py
index 047908f06e..c833ebede8 100644
--- a/libs/core/langchain_core/language_models/chat_models.py
+++ b/libs/core/langchain_core/language_models/chat_models.py
@@ -142,7 +142,7 @@ class BaseChatModel(BaseLanguageModel[BaseMessage], ABC):
             return input
         elif isinstance(input, str):
             return StringPromptValue(text=input)
-        elif isinstance(input, list):
+        elif isinstance(input, Sequence):
             return ChatPromptValue(messages=input)
         else:
             raise ValueError(
diff --git a/libs/core/langchain_core/language_models/llms.py b/libs/core/langchain_core/language_models/llms.py
index 4ecfc93521..228a3814f1 100644
--- a/libs/core/langchain_core/language_models/llms.py
+++ b/libs/core/langchain_core/language_models/llms.py
@@ -205,7 +205,7 @@ class BaseLLM(BaseLanguageModel[str], ABC):
             return input
         elif isinstance(input, str):
             return StringPromptValue(text=input)
-        elif isinstance(input, list):
+        elif isinstance(input, Sequence):
             return ChatPromptValue(messages=input)
         else:
             raise ValueError(