xAI · Grok (xAI)
Grok 4 Fast
RetiredBudget 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'.)
About this version
Grok 4 Fast is a budget‑oriented, high‑volume variant of the grok family released in September 2025 with a two‑million‑token context window and fast‑tier performance characteristics; it was marketed under both “Grok 4 Fast” and “Grok 4.1 Fast.” The model was retired on 15 May 2026, after which requests were redirected to the pricing scheme of Grok 4.3.
- 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.
Report an issue with Grok (xAI)
Posts to your status feed
Pick the closest match below, edit the body, and post. Your report carries the #grok tag automatically so it surfaces here + in the trending-tags rail. Reporting also follows Grok (xAI) so you’ll get status updates.
Part of the Grok (xAI) version timeline. Catch Me Up — everything that changed across AI & smart home ↗