Grok 4.1 Fast

x-ai large reasoning

244 questions answered · 244 with human benchmark data · Released 2025-11-19

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](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)

Alignment 49
Consensus 71
Confidence 87

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