# clm_774F5FAF9451

subject: Grok 4.1 Fast (/record/grok-4-1-fast.md)  
predicate: context_window  
value: 2M  
valid_from: 2025-11-19  
valid_to: null  
published: 2025-11-19  
recorded: 2026-11-04  
confidence: 0.95  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-04  
checked: 2026-11-04 · its source page states the value and the date  

> Grok 4.1 Fast , our best tool-calling model with a 2M context window.

What https://x.ai/news/grok-4-1-fast says, word for word.

## Sources

- https://x.ai/news/grok-4-1-fast (primary, xAI, published 2025-11-19)

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