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    • © 2025 OpenRouter, Inc

    xAI: Grok 4.1 Fast

    x-ai/grok-4.1-fast

    Created Nov 19, 20252,000,000 context
    Starting at $0.20/M input tokensStarting at $0.50/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

    Recent activity on Grok 4.1 Fast

    Total usage per day on OpenRouter

    Prompt
    16.8B
    Reasoning
    2.2B
    Completion
    643M

    Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.