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xai[patch]: support dedicated structured output feature (#29853)

Browse Source 
https://docs.x.ai/docs/guides/structured-outputs

Interface appears identical to OpenAI's.
```python
from langchain.chat_models import init_chat_model
from pydantic import BaseModel

class Joke(BaseModel):
    setup: str
    punchline: str

llm = init_chat_model("xai:grok-2").with_structured_output(
    Joke, method="json_schema"
)
llm.invoke("Tell me a joke about cats.")
```
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ccurme 2025-02-17 14:19:51 -05:00 committed by GitHub
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libs/partners/xai/langchain_xai/chat_models.py
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@ -348,9 +348,14 @@ class ChatXAI(BaseChatOpenAI): # type: ignore[override]
self.client = openai.OpenAI(
**client_params, **sync_specific
).chat.completions
self.root_client = openai.OpenAI(**client_params, **sync_specific)
if not (self.async_client or None):
async_specific: dict = {"http_client": self.http_async_client}
self.async_client = openai.AsyncOpenAI(
**client_params, **async_specific
).chat.completions
self.root_async_client = openai.AsyncOpenAI(
**client_params,
**async_specific,
)
return self