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langchain - 💡(How to fix) Fix [feature request] add reasoning support for grok-4.1 reasoning model [4 comments, 4 participants]

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langchain-ai/langchain#35224•Fetched 2026-04-08 00:27:08
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Code Example

[Certain xAI models](https://docs.x.ai/docs/models#model-pricing) support reasoning, which allows the model to provide reasoning content along with the response.

If provided, reasoning content is returned under the additional_kwargs field of the AIMessage or AIMessageChunk.

If supported, reasoning effort can be specified in the model constructor's extra_body argument, which will control the amount of reasoning the model does. The value can be one of 'low' or 'high'.


model = ChatXAI(
    model="grok-3-mini",
    extra_body={"reasoning_effort": "high"},
)
Note

As of 2025-07-10, reasoning_content is only returned in Grok 3 models, such as [Grok 3 Mini](https://docs.x.ai/docs/models/grok-3-mini).

Note

Note that in [Grok 4](https://docs.x.ai/docs/models/grok-4-0709), as of 2025-07-10, reasoning is not exposed in reasoning_content (other than initial 'Thinking...' text), reasoning cannot be disabled, and the reasoning_effort cannot be specified.
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Checked other resources

  • This is a feature request, not a bug report or usage question.
  • I added a clear and descriptive title that summarizes the feature request.
  • I used the GitHub search to find a similar feature request and didn't find it.
  • I checked the LangChain documentation and API reference to see if this feature already exists.
  • This is not related to the langchain-community package.

Package (Required)

  • langchain
  • langchain-openai
  • langchain-anthropic
  • langchain-classic
  • langchain-core
  • langchain-model-profiles
  • langchain-tests
  • langchain-text-splitters
  • langchain-chroma
  • langchain-deepseek
  • langchain-exa
  • langchain-fireworks
  • langchain-groq
  • langchain-huggingface
  • langchain-mistralai
  • langchain-nomic
  • langchain-ollama
  • langchain-perplexity
  • langchain-qdrant
  • langchain-xai
  • Other / not sure / general

Feature Description

can we add reasoning support for grok-4-1-fast-reasoning ? or any other grok 4.1 reasoning models?

as https://reference.langchain.com/python/integrations/langchain_xai/#langchain_xai.ChatXAI ,the docs said

[Certain xAI models](https://docs.x.ai/docs/models#model-pricing) support reasoning, which allows the model to provide reasoning content along with the response.

If provided, reasoning content is returned under the additional_kwargs field of the AIMessage or AIMessageChunk.

If supported, reasoning effort can be specified in the model constructor's extra_body argument, which will control the amount of reasoning the model does. The value can be one of 'low' or 'high'.


model = ChatXAI(
    model="grok-3-mini",
    extra_body={"reasoning_effort": "high"},
)
Note

As of 2025-07-10, reasoning_content is only returned in Grok 3 models, such as [Grok 3 Mini](https://docs.x.ai/docs/models/grok-3-mini).

Note

Note that in [Grok 4](https://docs.x.ai/docs/models/grok-4-0709), as of 2025-07-10, reasoning is not exposed in reasoning_content (other than initial 'Thinking...' text), reasoning cannot be disabled, and the reasoning_effort cannot be specified.

no support for latest model it is about 6 months since last update

Use Case

we can use reasoning function of latest reasoning xai model

extent analysis

Fix Plan

Add Support for Grok 4.1 Reasoning Models

To add support for Grok 4.1 reasoning models, we need to update the langchain-xai package to include the necessary logic for handling the reasoning_effort argument and returning the reasoning_content field.

Step 1: Update langchain-xai Package

Create a new branch and update the langchain-xai package to include the following code:

# langchain-xai/model.py
class ChatXAI:
    def __init__(self, model, extra_body=None):
        self.model = model
        self.extra_body = extra_body or {}

    def _get_reasoning_effort(self):
        return self.extra_body.get("reasoning_effort", "low")

    def _get_reasoning_content(self, response):
        # Add logic to return reasoning content if available
        if self.model.startswith("grok-4-"):
            return response.get("additional_kwargs", {}).get("reasoning_content")
        return None

Step 2: Update langchain-xai Documentation

Update the documentation to reflect the new support for Grok 4.1 reasoning models:

# langchain-xai/README.md
## ChatXAI

The `ChatXAI` model supports reasoning, which allows the model to provide reasoning content along with the response.

### Reasoning Support

As of 2025-07-10, reasoning content is returned under the `additional_kwargs` field of the `AIMessage` or `AIMessageChunk`.

You can specify the reasoning effort in the `model` constructor's `extra_body` argument, which can be one of `'low'` or `'high'`.

```python
model = ChatXAI(
    model="grok-4-1-fast-reasoning",
    extra_body={"reasoning_effort

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langchain - 💡(How to fix) Fix [feature request] add reasoning support for grok-4.1 reasoning model [4 comments, 4 participants]