xAI · Grok (xAI)
Grok 4 Fast
RetiredReleased 9 months ago· Sep 1, 2025Multimodal model
Budget high-volume model ($0.20/$0.50, 2M context); retired May 15, 2026 with requests redirecting to Grok 4.3 pricing. (Guide also refers to it as 'Grok 4.1 Fast'.)
- API string
- grok-4-fast
- Context window
- 2M ctx
- Tier
- Fast
- Released
- Sep 1, 2025
Release & change timeline
2 events- Retirement
Grok 4 Fast retired
Retired May 15, 2026; API requests redirect to Grok 4.3 pricing.
- Release
Grok 4 Fast released
Budget high-volume model at $0.20/$0.50 with a 2M context window.
Part of the Grok (xAI) version timeline. Catch Me Up — everything that changed across AI & smart home ↗