Models / xai / Grok 4.1 Fast Reasoning

Grok 4.1 Fast Reasoning

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Latest version of the fast reasoning variant of Grok 4.1, optimized for rapid inference with chain-of-thought reasoning.

textreasoningstreamingcode-generationfunction-callingtool-usevisionprompt-cachingjson-mode
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2M
context window
2M
max output
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