# gemini-3.6-flash

Calls to the model gemini-3.6-flash on Vertex AI stop working on November 19, 2026.

On November 19, 2026, the model gemini-3.6-flash reaches retirement. Any calls sent to model gemini-3.6-flash after this date will fail. This retirement affects all requests targeting this specific model ID directly on the platform.

## The error Vertex AI returns once gemini-3.6-flash is gone

HTTP 404

```json
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/gemini-3.6-flash` 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

Move to the recommended replacement model ID gemini-3.8-flash.

- API: Vertex AI (aiplatform.googleapis.com)
- Model: gemini-3.6-flash
- Released: July 21, 2026 (models.dev)
- Kind: Model retirement
- Takes effect: November 19, 2026
- Calls after that day: fail
- Calls it hits: `model gemini-3.6-flash`
- Source: [Deprecations page](https://cloud.google.com/vertex-ai/generative-ai/docs/learn/model-versions)
- Verified: November 6, 2026, against Vertex AI's own pages
- Page: https://www.okapi.bot/models/vertex-ai/gemini-3.6-flash/

## Vertex AI's words

> Model ID: gemini-3.6-flash; Release date: July 21, 2026; Retirement date: November 19, 2026; Replacement model ID: gemini-3.8-flash

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