# 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 retired model claude-opus-4-1. Calls targeting this model fail since that date. The retirement affects all requests specifying model claude-opus-4-1.

## What to use instead

Migrate to claude-opus-5. Note that claude-opus-5 stops working on July 8, 2027, and no permanent replacement is named yet.

- API: Azure AI Foundry (*.services.ai.azure.com)
- Model: claude-opus-4-1
- Released: August 5, 2025 (models.dev)
- 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: November 6, 2026, against Azure AI Foundry's own pages
- Page: https://www.okapi.bot/models/azure-ai-foundry/claude-opus-4-1/

## Azure AI Foundry's words

> Model: claude-opus-4-1; Version: —; Lifecycle: Retired; Retirement date: 2026-08-05; Replacement: claude-opus-5

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