Is xAI Grok 4 Fast (reasoning) deprecated?
Retired
No longer available. xAI shut Grok 4 Fast (reasoning) down on 2026-05-15 — calls to it fail.
Lifecycle dates
- Status
- Retired
- Deprecation announced
- Shutdown date
Pricing & context
- Input
- — / M tokens
- Output
- — / M tokens
- Context window
- —
Sources
- docs.x.ai https://docs.x.ai/developers/migration/may-15-retirement
- help.apiyi.com https://help.apiyi.com/en/grok-4-3-release-xai-api-model-retirement-en.html
Verified against the source on . Dataset snapshot . Providers can change a date without notice — the link above is always the final word.
Common questions
- Is Grok 4 Fast (reasoning) deprecated?
- No longer available. xAI shut Grok 4 Fast (reasoning) down on 2026-05-15 — calls to it fail.
- When does Grok 4 Fast (reasoning) shut down?
- xAI has announced 2026-05-15 as the shutdown date for Grok 4 Fast (reasoning).
- What does Grok 4 Fast (reasoning) cost?
- No public price is listed for Grok 4 Fast (reasoning) in our dataset.
- What can I use instead of Grok 4 Fast (reasoning)?
- Active alternatives from xAI include Grok Build 0.1, Grok 4.3, Grok 4.20 (reasoning).