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-image/

# Nano Banana 2 (Gemini 3.1 Flash Image)

Google DeepMind, Gemini Image family. Status: deprecated. Type: image generation. Released: 2026-02-26.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Gemini API | `gemini-3.1-flash-image` | https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image:generateContent | https://ai.google.dev/gemini-api/docs/models/gemini-3.1-flash-image |
| Google Cloud Gemini Enterprise Agent Platform (Vertex AI) |  |  | https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/gemini/3-1-flash-image |
| OpenRouter | `google/gemini-3.1-flash-image` |  |  |
| Web app |  |  | https://gemini.google.com |

## Pricing

- Input: $0.50 per 1M tokens
- Output: $3 per 1M tokens
- Per 1K image: $0.067
- Per 4K image: $0.151
- Unit as published: per 1M tokens text/image input and text output; image output $60 per 1M tokens = $0.045 (0.5K) / $0.067 (1K) / $0.101 (2K) / $0.151 (4K) per image
- Source: https://ai.google.dev/gemini-api/docs/pricing
- Last checked: 2026-10-07

## Specs

- Input: text, image, video, pdf
- Output: image, text
- Context window: 131,072 tokens
- Max output: 32,768 tokens
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer image generation models in the registry since its release: 20. The 5 newest:
  - GPT Image 2.6 Flare (2026-11-04) https://postcutoff.com/m/gpt-image-2-6-flare/
  - GPT Image 2.6 Sunburst (2026-11-04) https://postcutoff.com/m/gpt-image-2-6-sunburst/
  - MOSS-Image (2026-10-16) https://postcutoff.com/m/moss-image/
  - FLUX 3 Image Klein (2026-10-15) https://postcutoff.com/m/flux-3-image-klein/
  - Krea 3 (Fast / High / Ultra modes) (2026-10-15) https://postcutoff.com/m/krea-3/
- Before it from Google: Nano Banana Pro (Gemini 3 Pro Image) (2025-11-20) https://postcutoff.com/m/gemini-3-pro-image/
- After it from Google: Nano Banana 2 Lite (Gemini 3.1 Flash-Lite Image) (2026-06-30) https://postcutoff.com/m/gemini-3-1-flash-lite-image/
- Closed weights; access is hosted only.

## What stands out

- Pro quality at Flash speed: Brings Nano Banana Pro world knowledge, reasoning and quality to a fast Flash model. Source: https://blog.google/innovation-and-ai/technology/ai/nano-banana-2/
- Image search grounding: Uses real-time web/image search to render real subjects accurately; supports thinking. Source: https://ai.google.dev/gemini-api/docs/models/gemini-3.1-flash-image
- Text rendering and in-image translation: Legible text for marketing assets and translation of text inside images. Source: https://blog.google/innovation-and-ai/technology/ai/nano-banana-2/
- Extreme aspect ratios and 512px-4K: 0.5K/1K/2K/4K outputs and 1:4, 4:1, 1:8, 8:1 ratios; consistency of up to 5 characters and 14 objects. Source: https://ai.google.dev/gemini-api/docs/models/gemini-3.1-flash-image

## Notes

Deprecated on 2026-10-06 (no shutdown date announced) in favour of gemini-nano-banana-2.1 (Gemini API changelog). Preview id gemini-3.1-flash-image-preview (2026-02-26, still served); stable id GA 2026-05-28. Replacement for gemini-2.5-flash-image and Imagen 4. OpenRouter lists 131k context for stable id.

Default Google image generation/editing model: fast, text-accurate, search-grounded.

```bash
curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" -H "Content-Type: application/json" \
  -d '{"contents":[{"parts":[{"text":"A poster that says HELLO WORLD in neon letters"}]}]}'
```

Sources: [model page](https://ai.google.dev/gemini-api/docs/models/gemini-3.1-flash-image), [pricing](https://ai.google.dev/gemini-api/docs/pricing), [deprecations](https://ai.google.dev/gemini-api/docs/deprecations), [launch blog](https://blog.google/innovation-and-ai/technology/ai/nano-banana-2/).

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