# grok-4-fast-non-reasoning

Calls to the model grok-4-fast-non-reasoning on Azure AI Foundry stopped working on May 1, 2026.

On May 1, 2026, Azure AI Foundry will retire model grok-4-fast-non-reasoning. Any calls made using this model identifier will fail after that day.

## What to use instead

Migrate to grok-4-1-fast-non-reasoning, though that model will also stop working on May 19, 2027. No replacement that holds beyond that date is named yet.

- API: Azure AI Foundry (*.services.ai.azure.com)
- Model: grok-4-fast-non-reasoning
- Kind: Model retirement
- Takes effect: May 1, 2026
- Calls after that day: fail
- Calls it hits: `model grok-4-fast-non-reasoning`
- Source: [Deprecations page](https://learn.microsoft.com/en-us/azure/foundry/openai/concepts/model-retirement-schedule)
- Verified: October 29, 2026, against Azure AI Foundry's own pages
- Page: https://www.okapi.bot/models/azure-ai-foundry/grok-4-fast-non-reasoning/

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