diff --git a/libs/partners/openai/langchain_openai/chat_models/base.py b/libs/partners/openai/langchain_openai/chat_models/base.py
index b01a560e232..1783bd052f5 100644
--- a/libs/partners/openai/langchain_openai/chat_models/base.py
+++ b/libs/partners/openai/langchain_openai/chat_models/base.py
@@ -3875,7 +3875,9 @@ def _construct_lc_result_from_responses_api(
                         "annotations": [
                             annotation.model_dump()
                             for annotation in content.annotations
-                        ],
+                        ]
+                        if isinstance(content.annotations, list)
+                        else [],
                         "id": output.id,
                     }
                     content_blocks.append(block)