diff --git a/libs/core/langchain_core/load/mapping.py b/libs/core/langchain_core/load/mapping.py
index e90e98bfaf..f82658252d 100644
--- a/libs/core/langchain_core/load/mapping.py
+++ b/libs/core/langchain_core/load/mapping.py
@@ -239,7 +239,7 @@ SERIALIZABLE_MAPPING: dict[tuple[str, ...], tuple[str, ...]] = {
         "base",
         "ChatOpenAI",
     ),
-    ("langchain", "chat_models", "openai", "ChatLangSmithGateway"): (
+    ("langchain", "chat_models", "langsmith", "ChatLangSmithGateway"): (
         "langchain_openai",
         "chat_models",
         "langsmith",
diff --git a/libs/partners/openai/langchain_openai/chat_models/langsmith.py b/libs/partners/openai/langchain_openai/chat_models/langsmith.py
index a5457c9edb..172c1ad001 100644
--- a/libs/partners/openai/langchain_openai/chat_models/langsmith.py
+++ b/libs/partners/openai/langchain_openai/chat_models/langsmith.py
@@ -60,4 +60,4 @@ class ChatLangSmithGateway(ChatOpenAI):
     @override
     def get_lc_namespace(cls) -> list[str]:
         """Get the stable serialization namespace for LangSmith chat models."""
-        return ["langchain", "chat_models", "openai"]
+        return ["langchain", "chat_models", "langsmith"]
diff --git a/libs/partners/openai/tests/unit_tests/chat_models/test_langsmith.py b/libs/partners/openai/tests/unit_tests/chat_models/test_langsmith.py
index a5518cf44d..74590691c2 100644
--- a/libs/partners/openai/tests/unit_tests/chat_models/test_langsmith.py
+++ b/libs/partners/openai/tests/unit_tests/chat_models/test_langsmith.py
@@ -29,7 +29,7 @@ def test_gateway_key_priority_and_serialization_round_trip(
     assert model.lc_id() == [
         "langchain",
         "chat_models",
-        "openai",
+        "langsmith",
         "ChatLangSmithGateway",
     ]
     assert '"id": ["LANGSMITH_GATEWAY_API_KEY"]' in serialized