Vertex AI (us-central1-aiplatform.googleapis.com)
imagen-4.0-ultra-generate-preview-06-06 model retirement
Stopped workingSubscribe to Vertex AI (us-central1-aiplatform.googleapis.com)Share
Calls to the model imagen-4.0-ultra-generate-preview-06-06 on Vertex AI (us-central1-aiplatform.googleapis.com) stopped working on November 30, 2025.
The error you get
What Vertex AI (us-central1-aiplatform.googleapis.com) answers a call to imagen-4.0-ultra-generate-preview-06-06 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-preview-06-06` 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 imagen-4.0-ultra-generate-preview-06-06
Migrate all workflows using the preview model to the generally available model imagen-4.0-ultra-generate-001 before November 30, 2025 to avoid service disruption.
In Vertex AI (us-central1-aiplatform.googleapis.com)'s words
imagen-4.0-ultra-generate-preview-06-06
Facts
- API
- Vertex AI (us-central1-aiplatform.googleapis.com)
us-central1-aiplatform.googleapis.com - Model
imagen-4.0-ultra-generate-preview-06-06- Kind
- Model retirement
- Announced
- October 14, 2025
- Takes effect
- November 30, 2025
- Calls after that day
- Fail
- Source
- Changelog
- Last updated
- Verified
- , against Vertex AI (us-central1-aiplatform.googleapis.com)'s own pages
Questions
When does imagen-4.0-ultra-generate-preview-06-06 shut down?
Calls to the model imagen-4.0-ultra-generate-preview-06-06 on Vertex AI (us-central1-aiplatform.googleapis.com) stopped working on November 30, 2025.
What happens to calls after November 30, 2025?
They have failed since November 30, 2025.
What error does imagen-4.0-ultra-generate-preview-06-06 return once it is shut down?
Vertex AI (us-central1-aiplatform.googleapis.com) answers HTTP 404: "Publisher model `projects/{project}/locations/{region}/publishers/google/models/imagen-4.0-ultra-generate-preview-06-06` 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.
imagen-4.0-ultra-generate-preview-06-06 on other APIs 1
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Gemini API
imagen-4.0-ultra-generate-preview-06-06Model 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.