# claude-opus-4-1

Calls to the model claude-opus-4-1 on Azure AI Foundry stopped working on August 5, 2026.

On August 5, 2026, Azure AI Foundry will retire model claude-opus-4-1. Calls targeting this model will fail after that date. Ensure your applications transition off this model before the retirement takes effect.

## What to use instead

Migrate to claude-opus-5, which stops working on July 8, 2027. No permanent replacement has been named yet.

- API: Azure AI Foundry (*.services.ai.azure.com)
- Model: claude-opus-4-1
- Kind: Model retirement
- Takes effect: August 5, 2026
- Calls after that day: fail
- Calls it hits: `model claude-opus-4-1`
- 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/claude-opus-4-1/

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