Release dates
— Grok 4 Fast launched. ↗
Grok 4 Fast
An efficient Grok 4 variant unifying reasoning and non-reasoning modes with 2M context and live search.
MODEL NUMBER135
- First public date
- 2025-09-19
- 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
Hybrid reasoningLong context
Connected tools
Web searchX search
04
Release history
Grok 4 Fast launched.
View source05
Related models
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06
Sources
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