diff --git a/litellm/responses/streaming_iterator.py b/litellm/responses/streaming_iterator.py
index 8c7ba9350d8..48d5af58aad 100644
--- a/litellm/responses/streaming_iterator.py
+++ b/litellm/responses/streaming_iterator.py
@@ -418,9 +418,7 @@ class BaseResponsesAPIStreamingIterator:
                             # missing/invalid/duplicate index: append after the highest known
                             # index so the fallback can never collide with a real index and
                             # silently discard a streamed item
-                            _fallback_index: Final = (
-                                max(self._streamed_output_items.keys(), default=-1) + 1
-                            )
+                            _fallback_index: Final = max(self._streamed_output_items.keys(), default=-1) + 1
                             self._streamed_output_items[_fallback_index] = _done_item
                 elif _event_type == ResponsesAPIStreamEvents.OUTPUT_TEXT_ANNOTATION_ADDED:
                     _annotation: Final[object] = getattr(openai_responses_api_chunk, "annotation", None)
diff --git a/tests/test_litellm/test_responses_api_bridge_non_stream.py b/tests/test_litellm/test_responses_api_bridge_non_stream.py
index c438a409f0a..358134fb5e0 100644
--- a/tests/test_litellm/test_responses_api_bridge_non_stream.py
+++ b/tests/test_litellm/test_responses_api_bridge_non_stream.py
@@ -65,6 +65,7 @@ def test_should_collect_response_from_stream():
     assert collected.id == "resp-1"
     assert collected._hidden_params.get("headers") == {"x-test": "1"}
 
+
 class _RecoverableResponsesStream(_FakeResponsesStream):
     """Terminal response.completed carries an empty output array even though
     output_item.done events streamed the full answer (issue #41009)."""
@@ -104,9 +105,7 @@ def test_collect_response_from_stream_rebuilds_empty_output_from_streamed_items(
             "type": "message",
             "status": "completed",
             "role": "assistant",
-            "content": [
-                {"type": "output_text", "text": "Hi! How can I help?", "annotations": []}
-            ],
+            "content": [{"type": "output_text", "text": "Hi! How can I help?", "annotations": []}],
         }
     ]
     stream = _RecoverableResponsesStream(response, streamed_items)
@@ -133,9 +132,7 @@ async def test_collect_response_from_stream_async_rebuilds_empty_output_from_str
             "type": "message",
             "status": "completed",
             "role": "assistant",
-            "content": [
-                {"type": "output_text", "text": "Hi! How can I help?", "annotations": []}
-            ],
+            "content": [{"type": "output_text", "text": "Hi! How can I help?", "annotations": []}],
         }
     ]
     stream = _RecoverableAsyncResponsesStream(response, streamed_items)