# gemini-3-pro-image-preview

Calls to the model gemini-3-pro-image-preview on Vertex AI stopped working on July 17, 2026.

On July 17, 2026, the model gemini-3-pro-image-preview was retired. Calls targeting this model fail and are no longer accessible. The change took effect immediately upon announcement.

## The error Vertex AI returns once gemini-3-pro-image-preview is gone

HTTP 404

```json
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/gemini-3-pro-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

Update your code to use either gemini-3.1-flash-image or gemini-3-flash-image instead.

- API: Vertex AI (aiplatform.googleapis.com)
- Model: gemini-3-pro-image-preview
- Released: November 20, 2025 (models.dev)
- Kind: Model retirement
- Announced: July 17, 2026
- Takes effect: July 17, 2026
- Calls after that day: fail
- Calls it hits: `model gemini-3-pro-image-preview`
- Source: [Changelog](https://docs.cloud.google.com/gemini-enterprise-agent-platform/release-notes)
- Verified: November 6, 2026, against Vertex AI's own pages
- Page: https://www.okapi.bot/models/vertex-ai/gemini-3-pro-image-preview/

## 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.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent