Gemini API
imagen-4.0-fast-generate-001 model retirement
Stopped workingSubscribe to Gemini APIShare
Calls to model imagen-4.0-fast-generate-001 fail since August 17, 2026. The Gemini API shut down this model on that date. Requests targeting this identifier are no longer served.
The error you get
What Gemini API answers a call to imagen-4.0-fast-generate-001 once the model is gone, as recorded from real responses:
{"error":{"code":404,"message":"This model models/imagen-4.0-fast-generate-001 is no longer available to new users. Please update your code to use a newer model for the latest features and improvements.","status":"NOT_FOUND"}}{"error":{"code":404,"message":"models/imagen-4.0-fast-generate-001 is not found for API version v1beta, or is not supported for generateContent. Call ModelService.ListModels to see the list of available models and their supported methods.","status":"NOT_FOUND"}}What to use instead of imagen-4.0-fast-generate-001
Move to gemini-nano-banana-2.1, recommended by Google.
In Gemini API's words
Model: imagen-4.0-fast-generate-001; Release date: June 24, 2025; Shutdown date: August 17, 2026; Recommended replacement: gemini-nano-banana-2.1
Facts
- API
- Gemini API
generativelanguage.googleapis.com - Model
imagen-4.0-fast-generate-001- Kind
- Model retirement
- Takes effect
- August 17, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Gemini API's own pages
Questions
When does imagen-4.0-fast-generate-001 shut down?
Calls to the model imagen-4.0-fast-generate-001 on Gemini API stopped working on August 17, 2026.
What happens to calls after August 17, 2026?
They have failed since August 17, 2026.
What error does imagen-4.0-fast-generate-001 return once it is shut down?
Gemini API answers HTTP 404: "This model models/imagen-4.0-fast-generate-001 is no longer available to new users. Please update your code to use a newer model for the latest features and improvements.". 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-fast-generate-001 on other APIs 1
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Vertex AI
imagen-4.0-fast-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.