# o1

Calls to the model o1 on Azure AI Foundry stop working on November 19, 2026.

On November 19, 2026, the model o1 will be retired. Calls to model o1 will fail after this date. Version 2024-12-17 is marked as deprecated under the service lifecycle.

## What to use instead

Move to gpt-5.6-sol, which Microsoft recommends as the replacement.

- API: Azure AI Foundry (*.services.ai.azure.com)
- Model: o1
- Released: December 5, 2024 (models.dev)
- Kind: Model retirement
- Takes effect: November 19, 2026
- Calls after that day: fail
- Calls it hits: `model o1`
- 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/o1/

## Azure AI Foundry's words

> Model: o1; Version: 2024-12-17; Lifecycle: Deprecated; Retirement date: 2026-11-19; Replacement: gpt-5.6-sol

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