retired · xAI
grok-4-1-fast-non-reasoning
xAI lists this model ID as retired with a shutdown date of 2026-05-15.
- Shutdown date
- 2026-05-15
- Status
- retired
- Official replacement
grok-4.3- Replacement confidence
- medium
- Provider
- xAI
- Official pages checked
- 2026-08-14
Primary evidence
Provider-owned documentation
xAI official deprecation page ↗
Official redirect changes the model and reasoning effort; report only.
Migration caution
An official replacement can change output quality, price, latency, rate limits, token limits, and supported parameters. This replacement is not eligible for the default deterministic repair path.
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