# claude-3-5-sonnet@* stops working

Calls to models claude-3-5-sonnet@* on Vertex AI stopped working on February 19, 2026.

- API: Vertex AI (aiplatform.googleapis.com)
- Kind: Model retirement
- Takes effect: February 19, 2026
- Calls after that day: fail
- Calls it hits: `models claude-3-5-sonnet@*`
- Source: [Deprecations page](https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/deprecations/partner-models)
- Page: https://www.okapi.bot/providers/vertex-ai/breaking-changes/claude-3-5-sonnet-stops-working/