# gpt-5.1-chat

Calls to the model gpt-5.1-chat on Azure AI Foundry stopped working on June 29, 2026.

## What to use instead

gpt-chat-latest, named first, stops working on 2026-11-17. No replacement that holds is named yet.

- API: Azure AI Foundry (*.services.ai.azure.com)
- Model: gpt-5.1-chat
- Kind: Model retirement
- Takes effect: June 29, 2026
- Calls after that day: fail
- Calls it hits: `model gpt-5.1-chat`
- 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/gpt-5.1-chat/

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