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    xAI: Grok 4.1 Fast

    x-ai/grok-4.1-fast

    Created Nov 19, 20252,000,000 context
    $0/M input tokens$0/M output tokens

    Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window.

    Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docs

    Providers for Grok 4.1 Fast

    OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.