# Google Gemini 2.5 Flash-Lite (preview 09-2025) — deprecation status

> Yes — Gemini 2.5 Flash-Lite (preview 09-2025) is retired. Google shut it down on March 31, 2026; API requests to it now fail. The recommended replacement is Gemini 3.1 Flash-Lite.

A September 2025 preview of the Flash-Lite tier, notable mainly for its id format: it used a four-digit year where every other Gemini preview uses two. Shut down March 2026.

## Facts

| Field | Value |
| --- | --- |
| Provider | Google |
| Model id | `gemini-2.5-flash-lite-preview-09-2025` |
| Status | Retired |
| Released | September 25, 2025 |
| Shutdown | March 31, 2026 (121 days ago) |
| Last verified | July 30, 2026 |

## Replacement

- **Gemini 3.1 Flash-Lite** (`gemini-3.1-flash-lite`) · recommended — https://modeldeprecations.dev/google/gemini-3.1-flash-lite
  - Google routes this straight to the 3.1 Lite tier rather than to the stable 2.5 Flash-Lite, which is itself scheduled for October 2026.
  - Parameters it accepts: https://modelparams.dev/models/google/gemini-3.1-flash-lite

```diff
- "model": "gemini-2.5-flash-lite-preview-09-2025"
+ "model": "gemini-3.1-flash-lite"
```

## FAQ

### When did Google Gemini 2.5 Flash-Lite (preview 09-2025) shut down?

Google Gemini 2.5 Flash-Lite (preview 09-2025) shut down on March 31, 2026. API requests to it fail from that date onward.

### What replaces Google Gemini 2.5 Flash-Lite (preview 09-2025)?

Google recommends Gemini 3.1 Flash-Lite (`gemini-3.1-flash-lite`) as the replacement for Google Gemini 2.5 Flash-Lite (preview 09-2025). Google routes this straight to the 3.1 Lite tier rather than to the stable 2.5 Flash-Lite, which is itself scheduled for October 2026.

### Is Google Gemini 2.5 Flash-Lite (preview 09-2025) still available?

No. Google Gemini 2.5 Flash-Lite (preview 09-2025) is retired and no longer served — it was shut down on March 31, 2026. Calls to it return an error.

### How do I migrate from Google Gemini 2.5 Flash-Lite (preview 09-2025) to gemini-3.1-flash-lite?

Swap the model id in your API call: replace "gemini-2.5-flash-lite-preview-09-2025" with "gemini-3.1-flash-lite". Google routes this straight to the 3.1 Lite tier rather than to the stable 2.5 Flash-Lite, which is itself scheduled for October 2026.

## Sources

- [Gemini API deprecations](https://ai.google.dev/gemini-api/docs/deprecations) — accessed 2026-07-30

---

Canonical page: https://modeldeprecations.dev/google/gemini-2.5-flash-lite-preview-09-2025
JSON: https://modeldeprecations.dev/api/v1/models/google/gemini-2.5-flash-lite-preview-09-2025.json