diff --git a/libs/partners/anthropic/langchain_anthropic/chat_models.py b/libs/partners/anthropic/langchain_anthropic/chat_models.py
index d30d2fd1342..91cc511248a 100644
--- a/libs/partners/anthropic/langchain_anthropic/chat_models.py
+++ b/libs/partners/anthropic/langchain_anthropic/chat_models.py
@@ -88,6 +88,11 @@ class ChatAnthropicMessages(BaseChatModel):
 
     model_kwargs: Dict[str, Any] = Field(default_factory=dict)
 
+    class Config:
+        """Configuration for this pydantic object."""
+
+        allow_population_by_field_name = True
+
     @property
     def _llm_type(self) -> str:
         """Return type of chat model."""
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 4ad9b7c7b0c..ebcf0386aee 100644
--- a/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
+++ b/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
@@ -7,3 +7,4 @@ from langchain_anthropic.chat_models import ChatAnthropicMessages
 def test_initialization() -> None:
     """Test chat model initialization."""
     ChatAnthropicMessages(model_name="claude-instant-1.2", anthropic_api_key="xyz")
+    ChatAnthropicMessages(model="claude-instant-1.2", anthropic_api_key="xyz")