xAI
Grok 4.1 Fast
xAI's fast agentic tool-calling model with a 2M context window; non-reasoning variant for low-latency responses
xai/grok-4.1-fast
Context
2M
Output
30K
Released
2025-11-19
Knowledge cutoff
—
Types
InputTextImage
OutputText
Reasoning
—
Tool use
Supported
Structured output
Supported
Attachments
Supported
Open weights
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Provider pricing
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