# gemini-2.5-flash-preview-09-2025

Calls to the model gemini-2.5-flash-preview-09-2025 stopped working on February 17, 2026.

## The error Gemini API returns once gemini-2.5-flash-preview-09-2025 is gone

Once it is closed to new API keys: HTTP 404

```json
{"error":{"code":404,"message":"This model models/gemini-2.5-flash-preview-09-2025 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"}}
```

Once it is shut down: HTTP 404

```json
{"error":{"code":404,"message":"models/gemini-2.5-flash-preview-09-2025 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

Move to gemini-3.6-flash, recommended by Google.

- API: Gemini API (generativelanguage.googleapis.com)
- Model: gemini-2.5-flash-preview-09-2025
- Released: September 25, 2025 (models.dev)
- Kind: Model retirement
- Takes effect: February 17, 2026
- Calls after that day: fail
- Calls it hits: `model gemini-2.5-flash-preview-09-2025`
- Source: [Deprecations page](https://ai.google.dev/gemini-api/docs/deprecations)
- Verified: November 6, 2026, against Gemini API's own pages
- Page: https://www.okapi.bot/models/gemini-api/gemini-2.5-flash-preview-09-2025/

## Gemini API's words

> Model: gemini-2.5-flash-preview-09-2025; Release date: September 25, 2025; Shutdown date: February 17, 2026; Recommended replacement: gemini-3.6-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