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xAI: grok-4.1-fast-reasoning:free
grok-4.1-fast-reasoning:free
2M context131.1K outReasoningToolsVisionFilesStructuredWeb search
Released Nov 1, 2025Knowledge cutoff Dec 2024Updated Jun 20, 2026
A next-generation agentic reasoning model from xAI, optimized for high-speed tool-calling and complex multi-step planning. It features a massive 2M context window and enhanced emotional intelligence, achieving near-frontier reasoning performance (matching o3) at a fraction of the cost.
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Input price
$0.00/ 1M tokens
Output price
$0.00/ 1M tokens
Context window 200K tokensCompatible endpoints -Vendor xAI
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