Vertex AI
claude-3-5-sonnet model retirement
Stopped workingSubscribe to Vertex AIShare
Calls to the model claude-3-5-sonnet on Vertex AI stopped working on February 19, 2026.
The error you get
What Vertex AI answers a call to claude-3-5-sonnet once the model is gone, as recorded from real responses:
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/claude-3-5-sonnet` 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"}}Facts
- API
- Vertex AI
aiplatform.googleapis.com - Model
claude-3-5-sonnet- Kind
- Model retirement
- Takes effect
- February 19, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Vertex AI's own pages
Questions
When does claude-3-5-sonnet shut down?
Calls to the model claude-3-5-sonnet on Vertex AI stopped working on February 19, 2026.
What happens to calls after February 19, 2026?
They have failed since February 19, 2026.
What error does claude-3-5-sonnet return once it is shut down?
Vertex AI answers HTTP 404: "Publisher model `projects/{project}/locations/{region}/publishers/google/models/claude-3-5-sonnet` 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.". Send another model to fix it.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.