# veo-3.1-fast-generate-preview

Calls to the model veo-3.1-fast-generate-preview on Vertex AI (us-central1-aiplatform.googleapis.com) stopped working on April 2, 2026.

## The error Vertex AI (us-central1-aiplatform.googleapis.com) returns once veo-3.1-fast-generate-preview is gone

HTTP 404

```json
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/veo-3.1-fast-generate-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 model endpoints to veo-3.1-fast-generate-001 before April 2, 2026, to avoid service disruption.

- API: Vertex AI (us-central1-aiplatform.googleapis.com) (us-central1-aiplatform.googleapis.com)
- Model: veo-3.1-fast-generate-preview
- Kind: Model retirement
- Announced: March 3, 2026
- Takes effect: April 2, 2026
- Calls after that day: fail
- Calls it hits: `model veo-3.1-fast-generate-preview`
- Source: [Changelog](https://docs.cloud.google.com/vertex-ai/docs/release-notes)
- Verified: November 3, 2026, against Vertex AI (us-central1-aiplatform.googleapis.com)'s own pages
- Page: https://www.okapi.bot/models/vertex-ai-2/veo-3.1-fast-generate-preview/

## Vertex AI (us-central1-aiplatform.googleapis.com)'s words

> | `veo-3.1-fast-generate-preview` | `veo-3.1-fast-generate-001` |

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