Vertex AI
imagen-4.0-ultra-generate-001 model retirement
Stopped workingSubscribe to Vertex AIShare
Vertex AI retired model imagen-4.0-ultra-generate-001 on June 30, 2026. Requests sent to this model fail since that date. The change affects all calls targeting the model imagen-4.0-ultra-generate-001 identifier.
The error you get
What Vertex AI answers a call to imagen-4.0-ultra-generate-001 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-001` 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-001
Move to gemini-3.1-flash-lite-image. The earlier recommended upgrade, gemini-2.5-flash-image, stops working on March 15, 2027.
In Vertex AI's words
Model ID: imagen-4.0-ultra-generate-001; Release date: August 14, 2025; Retirement date: June 30, 2026; Recommended upgrade: gemini-2.5-flash-image
Facts
- API
- Vertex AI
aiplatform.googleapis.com - Model
imagen-4.0-ultra-generate-001- Kind
- Model retirement
- Takes effect
- June 30, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Vertex AI's own pages
Questions
When does imagen-4.0-ultra-generate-001 shut down?
Calls to the model imagen-4.0-ultra-generate-001 on Vertex AI stopped working on June 30, 2026.
What happens to calls after June 30, 2026?
They have failed since June 30, 2026.
What error does imagen-4.0-ultra-generate-001 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-001` 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-001 on other APIs 1
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Gemini API
imagen-4.0-ultra-generate-001Model 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.