As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/gemini-3-1-flash-lite/

# Gemini 3.1 Flash-Lite

Google DeepMind, Gemini 3 family. Status: deprecated. Type: language model. Released: 2026-05-07. Training cutoff: not published.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Gemini API | `gemini-3.1-flash-lite` | https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-lite:generateContent | https://ai.google.dev/gemini-api/docs/models/gemini-3.1-flash-lite |
| OpenRouter | `google/gemini-3.1-flash-lite` |  |  |

## Pricing

- Input: $0.25 per 1M tokens
- Output: $1.50 per 1M tokens
- Unit as published: per 1M tokens (Standard; text/image/video input; audio input $0.50)
- Source: https://ai.google.dev/gemini-api/docs/pricing
- Last checked: 2026-09-29

## Specs

- Input: text, image, audio, video, pdf
- Output: text
- Context window: 1,048,576 tokens
- Max output: 65,536 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- No published training cutoff. Counted from its release (2026-05-07): at least 1,854 AI events since (424 major, 83 historic), as of 2026-11-13.
- Everything since April 2026: https://postcutoff.com/since/2026-04/

## What stands out

- Low-cost frontier-class Lite: Described as frontier-class performance at reduced cost; cheapest per-token 3.x text model. Source: https://ai.google.dev/gemini-api/docs/models
- Full tool stack on a Lite model: 1M-token multimodal input (text, image, video, audio, PDF) with 65K output. Source: https://ai.google.dev/gemini-api/docs/models/gemini-3.1-flash-lite

## Notes

Stable GA 2026-05-07; scheduled shutdown 2027-05-07, replacement gemini-3.5-flash-lite. Preview id gemini-3.1-flash-lite-preview (early 2026) still listed by the live API / OpenRouter though docs list it as shut down.

Budget Gemini 3.1 model; migrate to `gemini-3.5-flash-lite` before May 2027.

```bash
curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-lite:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" -H "Content-Type: application/json" \
  -d '{"contents":[{"parts":[{"text":"Hello"}]}]}'
```

Sources: [model page](https://ai.google.dev/gemini-api/docs/models/gemini-3.1-flash-lite), [pricing](https://ai.google.dev/gemini-api/docs/pricing), [deprecations](https://ai.google.dev/gemini-api/docs/deprecations).

Model page: https://postcutoff.com/m/gemini-3-1-flash-lite/