# grok-4-latest

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

## The error xAI returns once grok-4-latest is gone

HTTP 400

```json
{"code":"invalid-argument","error":"Model not found: grok-4-latest"}
```

## 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.

- API: xAI (api.x.ai)
- Model: grok-4-latest
- Kind: Model retirement
- Takes effect: May 15, 2026
- Calls after that day: fail
- Calls it hits: `model grok-4-latest`
- Source: [models.dev](https://modeldeprecations.dev/api/v1/models.json?provider=xai)
- Verified: November 6, 2026, against xAI's own pages
- Page: https://www.okapi.bot/models/xai/grok-4-latest/

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent