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xAI (Grok)

The xai provider supports xAI's Grok models through an API interface compatible with OpenAI's format. The provider supports both text and vision capabilities depending on the model used.

Setup​

To use xAI's API, set the XAI_API_KEY environment variable or specify via apiKey in the configuration file.

export XAI_API_KEY=your_api_key_here

Provider Format​

The xAI provider includes support for the following model formats:

  • xai:grok-2-latest - Latest Grok-2 model (131K context)
  • xai:grok-2-vision-latest - Latest Grok-2 vision model (32K context)
  • xai:grok-2-vision-1212
  • xai:grok-2-1212
  • xai:grok-beta - Beta version (131K context)
  • xai:grok-vision-beta - Vision beta version (8K context)
  • As well as grok-3 variants whenever they become generally available

You can also use specific versioned models:

  • xai:grok-2-1212
  • xai:grok-2-vision-1212

Configuration​

The provider supports all OpenAI provider configuration options. Example usage:

providers:
  - id: xai:grok-2-latest
    config:
      temperature: 0.7
      apiKey: your_api_key_here # Alternative to XAI_API_KEY

Region Support​

You can specify a region to use a region-specific API endpoint:

providers:
  - id: xai:grok-2-latest
    config:
      region: us-west-1 # Will use https://us-west-1.api.x.ai/v1

This is equivalent to setting base_url="https://us-west-1.api.x.ai/v1" in the Python client.

Vision Support​

For models with vision capabilities, you can include images in your prompts using the same format as OpenAI. Create a prompt.yaml file:

- role: user
  content:
    - type: image_url
      image_url:
        url: '{{image_url}}'
        detail: 'high'
    - type: text
      text: '{{question}}'

Then reference it in your promptfoo config:

prompts:
  - file://prompt.yaml

providers:
  - id: xai:grok-2-vision-latest

tests:
  - vars:
      image_url: 'https://example.com/image.jpg'
      question: "What's in this image?"

For more information on the available models and API usage, refer to the xAI documentation.