diff --git a/libs/partners/anthropic/langchain_anthropic/chat_models.py b/libs/partners/anthropic/langchain_anthropic/chat_models.py
index 9e428296ad6..5795e5eaf08 100644
--- a/libs/partners/anthropic/langchain_anthropic/chat_models.py
+++ b/libs/partners/anthropic/langchain_anthropic/chat_models.py
@@ -1125,19 +1125,19 @@ class ChatAnthropic(BaseChatModel):
                 "get_num_tokens_from_messages does not yet support counting tokens "
                 "in tool calls."
             )
-        system, messages = _format_messages(messages)
-        if isinstance(system, str):
+        formatted_system, formatted_messages = _format_messages(messages)
+        if isinstance(formatted_system, str):
             response = self._client.beta.messages.count_tokens(
                 betas=["token-counting-2024-11-01"],
                 model=self.model,
-                system=system,
-                messages=messages,
+                system=formatted_system,
+                messages=formatted_messages,  # type: ignore[arg-type]
             )
         else:
             response = self._client.beta.messages.count_tokens(
                 betas=["token-counting-2024-11-01"],
                 model=self.model,
-                messages=messages,
+                messages=formatted_messages,  # type: ignore[arg-type]
             )
         return response.input_tokens
 
diff --git a/libs/partners/anthropic/tests/integration_tests/test_chat_models.py b/libs/partners/anthropic/tests/integration_tests/test_chat_models.py
index 5a7a1f780b9..47736880b25 100644
--- a/libs/partners/anthropic/tests/integration_tests/test_chat_models.py
+++ b/libs/partners/anthropic/tests/integration_tests/test_chat_models.py
@@ -317,7 +317,7 @@ async def test_anthropic_async_streaming_callback() -> None:
 def test_anthropic_multimodal() -> None:
     """Test that multimodal inputs are handled correctly."""
     chat = ChatAnthropic(model=MODEL_NAME)  # type: ignore[call-arg]
-    messages = [
+    messages: list[BaseMessage] = [
         HumanMessage(
             content=[
                 {
diff --git a/libs/partners/anthropic/tests/unit_tests/test_chat_models.py b/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
index b37246e986e..dcdf0f10bf1 100644
--- a/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
+++ b/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
@@ -331,7 +331,7 @@ def dummy_tool() -> BaseTool:
         arg1: int = Field(..., description="foo")
         arg2: Literal["bar", "baz"] = Field(..., description="one of 'bar', 'baz'")
 
-    class DummyFunction(BaseTool):
+    class DummyFunction(BaseTool):  # type: ignore[override]
         args_schema: Type[BaseModel] = Schema
         name: str = "dummy_function"
         description: str = "dummy function"