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    13. © 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

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