# gpt-5.3-chat

Calls to the model gpt-5.3-chat on Azure AI Foundry stopped working on June 29, 2026.

On June 29, 2026, model gpt-5.3-chat will be retired. Calls targeting this model will fail after that day. Ensure your integrations are updated before the retirement date to avoid service disruption.

## What to use instead

The model gpt-chat-latest is named first as a replacement, but it stops working on November 17, 2026. No permanent replacement has been named yet.

- API: Azure AI Foundry (*.services.ai.azure.com)
- Model: gpt-5.3-chat
- Kind: Model retirement
- Takes effect: June 29, 2026
- Calls after that day: fail
- Calls it hits: `model gpt-5.3-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-5.3-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