diff --git a/libs/partners/openai/langchain_openai/chat_models/base.py b/libs/partners/openai/langchain_openai/chat_models/base.py
index a446916d4e0..c3c94c46676 100644
--- a/libs/partners/openai/langchain_openai/chat_models/base.py
+++ b/libs/partners/openai/langchain_openai/chat_models/base.py
@@ -2330,6 +2330,7 @@ class BaseChatOpenAI(BaseChatModel):
                 # Batch API processing (50% cost savings, polling required)
                 results = llm.batch(inputs, use_batch_api=True)
         """
+
     def _convert_input_to_messages(
         self, input_item: LanguageModelInput
     ) -> list[BaseMessage]:
diff --git a/libs/partners/openai/tests/unit_tests/chat_models/test_batch.py b/libs/partners/openai/tests/unit_tests/chat_models/test_batch.py
index 47f1b03a755..9c2dedf20c6 100644
--- a/libs/partners/openai/tests/unit_tests/chat_models/test_batch.py
+++ b/libs/partners/openai/tests/unit_tests/chat_models/test_batch.py
@@ -48,9 +48,7 @@ class TestOpenAIBatchClient:
         ]
 
         batch_id = self.batch_client.create_batch(
-            requests=batch_requests,
-            description="Test batch",
-            metadata={"test": "true"},
+            requests=batch_requests, description="Test batch", metadata={"test": "true"}
         )
 
         assert batch_id == "batch_123"