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openai: fix streaming reasoning without summaries ()

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Following https://github.com/langchain-ai/langchain/pull/30909: need to
retain "empty" reasoning output when streaming, e.g.,
```python
{'id': 'rs_...', 'summary': [], 'type': 'reasoning'}
```
Tested by existing integration tests, which are currently failing.
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ccurme 2025-04-24 12:01:45 -04:00 committed by GitHub
parent 8fc7a723b9
commit 10a9c24dae
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1 changed files with 5 additions and 3 deletions

8
libs/partners/openai/langchain_openai/chat_models/base.py
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@ -3411,14 +3411,16 @@ def _convert_responses_chunk_to_generation_chunk(
)
elif chunk.type == "response.refusal.done":
additional_kwargs["refusal"] = chunk.refusal
elif chunk.type == "response.output_item.added" and chunk.item.type == "reasoning":
additional_kwargs["reasoning"] = chunk.item.model_dump(
exclude_none=True, mode="json"
)
elif chunk.type == "response.reasoning_summary_part.added":
additional_kwargs["reasoning"] = {
"type": "reasoning",
"id": chunk.item_id,
# langchain-core uses the `index` key to aggregate text blocks.
"summary": [
{"index": chunk.summary_index, "type": "summary_text", "text": ""}
],
]
}
elif chunk.type == "response.reasoning_summary_text.delta":
additional_kwargs["reasoning"] = {