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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

High

2M

Released

Nov 19, 2025

Activity

Activity

Token volume and request traffic to this model over time.