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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

Performance for Grok 4.1 Fast

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