xAI · Model retirement
grok-4
Stopped working
Calls to the model grok-4 on xAI stopped working on May 15, 2026.
What to use instead of grok-4
Move to grok-4.3. Maps to grok-4.3 with reasoning effort "low". Grok 4 had no non-reasoning mode at all, so this is the first time the workload can be run without thinking tokens if you want that.
Facts
- API
- xAI
api.x.ai - Model
grok-4- Kind
- Model retirement
- Takes effect
- May 15, 2026
- Calls after that day
- Fail
- Source
- models.dev
- Last updated
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