# grok-4

Calls to the model grok-4 on xAI stopped working on May 15, 2026.

- API: xAI (api.x.ai)
- Model: grok-4
- Kind: Model retirement
- Takes effect: May 15, 2026
- Calls after that day: fail
- Calls it hits: `model grok-4`
- Source: [models.dev](https://modeldeprecations.dev/api/v1/models.json?provider=xai)
- Page: https://www.okapi.bot/models/xai/grok-4/

## What to use instead

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.