# claude-3-opus

Calls to the model claude-3-opus on Vertex AI stopped working on August 1, 2025.

## The error Vertex AI returns once claude-3-opus is gone

HTTP 404

```json
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/claude-3-opus` was not found or your project does not have access to it. Ensure you are using a valid model name and that the model is available in the specified region.","status":"NOT_FOUND"}}
```

- API: Vertex AI (aiplatform.googleapis.com)
- Model: claude-3-opus
- Kind: Model retirement
- Takes effect: August 1, 2025
- Calls after that day: fail
- Calls it hits: `model claude-3-opus`
- Source: [Deprecations page](https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/deprecations/partner-models)
- Verified: November 6, 2026, against Vertex AI's own pages
- Page: https://www.okapi.bot/models/vertex-ai/claude-3-opus/

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