Vertex AI
veo-3.1-fast-generate-preview model retirement
Stopped workingSubscribe to Vertex AIShare
Calls to the model veo-3.1-fast-generate-preview on Vertex AI stopped working on April 2, 2026.
The error you get
What Vertex AI answers a call to veo-3.1-fast-generate-preview once the model is gone, as recorded from real responses:
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/veo-3.1-fast-generate-preview` 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"}}What to use instead of veo-3.1-fast-generate-preview
Update your model endpoints to veo-3.1-fast-generate-001 before April 2, 2026, to avoid service disruption.
In Vertex AI's words
| `veo-3.1-fast-generate-preview` | `veo-3.1-fast-generate-001` |
Facts
Questions
When does veo-3.1-fast-generate-preview shut down?
Calls to the model veo-3.1-fast-generate-preview on Vertex AI stopped working on April 2, 2026.
What happens to calls after April 2, 2026?
They have failed since April 2, 2026.
What error does veo-3.1-fast-generate-preview return once it is shut down?
Vertex AI answers HTTP 404: "Publisher model `projects/{project}/locations/{region}/publishers/google/models/veo-3.1-fast-generate-preview` 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.
veo-3.1-fast-generate-preview on other APIs 1
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Gemini API
veo-3.1-fast-generate-previewModel retirement Stopped working
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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.