Vertex AI
imagen-4.0-ultra-generate-exp-05-20 model retirement
Stopped workingSubscribe to Vertex AIShare
Calls to the model imagen-4.0-ultra-generate-exp-05-20 on Vertex AI stopped working on July 7, 2025.
The error you get
What Vertex AI answers a call to imagen-4.0-ultra-generate-exp-05-20 once the model is gone, as recorded from real responses:
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/imagen-4.0-ultra-generate-exp-05-20` 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"}}In Vertex AI's words
To avoid service interruption, migrate from imagen-4.0-ultra-generate-exp-05-20 and imagen-4.0-generate-preview-05-20 before 2025-07-07.
Facts
Questions
When does imagen-4.0-ultra-generate-exp-05-20 shut down?
Calls to the model imagen-4.0-ultra-generate-exp-05-20 on Vertex AI stopped working on July 7, 2025.
What happens to calls after July 7, 2025?
They have failed since July 7, 2025.
What error does imagen-4.0-ultra-generate-exp-05-20 return once it is shut down?
Vertex AI answers HTTP 404: "Publisher model `projects/{project}/locations/{region}/publishers/google/models/imagen-4.0-ultra-generate-exp-05-20` 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.