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xAI: Grok 4.1 Fast

x-ai/grok-4.1-fast

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(opens in new tab)

Modalities

Context

2M

Weekly Tokens

434B

Released

Nov 19, 2025

Activity

Recent activity on Grok 4.1 Fast

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