fix(openai): accommodate dict response items in streaming (#36899)

libs/partners/openai/tests/unit_tests/chat_models/test_responses_stream.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import copy
 from typing import Any
 from unittest.mock import MagicMock, patch
 
@@ -986,3 +987,32 @@ def test_responses_stream_function_call_preserves_namespace() -> None:
     assert first_block.get("namespace") == "my_namespace", (
         f"Expected namespace 'my_namespace', got {first_block.get('namespace')}"
     )
+
+
+def test_responses_stream_tolerates_dict_response_field() -> None:
+    """Regression test for `AttributeError: 'dict' object has no attribute 'id'`.
+
+    The OpenAI SDK types `<event>.response` strictly as `Response`, but raw dicts
+    have been observed in the wild.
+    """
+    stream = copy.deepcopy(responses_stream)
+    first_event = stream[0]
+    assert isinstance(first_event, ResponseCreatedEvent)
+    first_event.response = first_event.response.model_dump(mode="json")  # type: ignore[assignment]
+    assert isinstance(first_event.response, dict)
+
+    llm = ChatOpenAI(model="o4-mini", use_responses_api=True)
+    mock_client = MagicMock()
+
+    def mock_create(*args: Any, **kwargs: Any) -> MockSyncContextManager:
+        return MockSyncContextManager(stream)
+
+    mock_client.responses.create = mock_create
+
+    full: BaseMessageChunk | None = None
+    with patch.object(llm, "root_client", mock_client):
+        for chunk in llm.stream("test"):
+            assert isinstance(chunk, AIMessageChunk)
+            full = chunk if full is None else full + chunk
+    assert isinstance(full, AIMessageChunk)
+    assert full.id == "resp_123"