Release dates
— Grok 4.1 Fast and the Agent Tools API launched. ↗
Grok 4.1 Fast
A 2M-context fast agent model for real-world tool use and deep research, offered in reasoning and non-reasoning variants.
MODEL NUMBER137
- First public date
- 2025-11-19
- Organization
- SpaceXAI
- Family
- Grok
01
Specifications
Only published specifications are shown.
- Context
- 2,000,000 tokens
- Input modalities
- Text · Image
- Open weights
- No
- Status
- Legacy
02
Overview
03
Architecture & capabilities
Model capabilities
Tool useLong context
Connected tools
Code execution
Product features
Deep search
04
Release history
Grok 4.1 Fast and the Agent Tools API launched.
View source05
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06
Sources
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