# gpt-5.3-chat

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

Model gpt-5.3-chat was retired on June 29, 2026. Calls to this model fail since that date. The retirement affected version 2026-03-03 of the model.

## What to use instead

The replacement is gpt-chat-latest, but it stops working on November 17, 2026. No replacement that holds is 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: November 6, 2026, against Azure AI Foundry's own pages
- Page: https://www.okapi.bot/models/azure-ai-foundry/gpt-5.3-chat/

## Azure AI Foundry's words

> Model: gpt-5.3-chat; Version: 2026-03-03; Lifecycle: Retired; Retirement date: 2026-06-29; Replacement: gpt-chat-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