Grok 4.1 Fast
Major release: A new general-purpose AI model from a leading lab, the kind behind ChatGPT, Claude or Gemini: a new flagship or generation.
Key facts
- Released
- Nov 19, 2025
- What it does
- Text and chat: Writes, answers questions and holds a conversation.Code: Writes, explains and fixes code.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.
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- How
- For developers, through an API
- Announced as
- “Grok 4.1 Fast and Agent Tools API”
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
Compare Grok 4.1 Fast with
It came out 2 days after Grok 4.1, the lab's previous model.
The details
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