# claude-sonnet-4-5@* stops working

Calls to models claude-sonnet-4-5@* on Vertex AI stop working on November 30, 2026.

- API: Vertex AI (aiplatform.googleapis.com)
- Kind: Model retirement
- Takes effect: November 30, 2026
- Calls after that day: fail
- Calls it hits: `models claude-sonnet-4-5@*`
- 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/providers/vertex-ai/breaking-changes/claude-sonnet-4-5-stops-working/

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