# gpt-5.4-nano

Calls to the model gpt-5.4-nano on Azure AI Foundry stop working on September 21, 2027.

- API: Azure AI Foundry (*.services.ai.azure.com)
- Model: gpt-5.4-nano
- Kind: Model retirement
- Takes effect: September 21, 2027
- Calls after that day: fail
- Calls it hits: `model gpt-5.4-nano`
- 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-5.4-nano/

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