Vertex AI
gemini-3.1-flash-image-preview model retirement
Stopped workingSubscribe to Vertex AIShare
On July 17, 2026, the model gemini-3.1-flash-image-preview was retired and is no longer accessible. Requests sent to this model fail since that date.
The error you get
What Vertex AI answers a call to gemini-3.1-flash-image-preview once the model is gone, as recorded from real responses:
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/gemini-3.1-flash-image-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 gemini-3.1-flash-image-preview
Update your code to use either gemini-3.1-flash-image or gemini-3-flash-image instead.
In Vertex AI's words
The Nano Banana preview models gemini-3.1-flash-image-preview and gemini-3-pro-image-preview have been retired and are no longer accessible.
Facts
Questions
When does gemini-3.1-flash-image-preview shut down?
Calls to the model gemini-3.1-flash-image-preview on Vertex AI stopped working on July 17, 2026.
What happens to calls after July 17, 2026?
They have failed since July 17, 2026.
What error does gemini-3.1-flash-image-preview return once it is shut down?
Vertex AI answers HTTP 404: "Publisher model `projects/{project}/locations/{region}/publishers/google/models/gemini-3.1-flash-image-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.
When was gemini-3.1-flash-image-preview released?
gemini-3.1-flash-image-preview was released on February 26, 2026, according to models.dev.
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.
gemini-3.1-flash-image-preview on other APIs 1
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Gemini API
gemini-3.1-flash-image-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.