Nano Banana 2 (Gemini 3.1 Flash Image Preview)
google/gemini-3.1-flash-image-preview
Gemini 3.1 Flash Image Preview, a.k.a. "Nano Banana 2," is Google’s latest state of the art image generation and editing model, delivering Pro-level visual quality at Flash speed.
Key facts
- Input price
- $0.50 / 1M tokens
- Output price
- $3.00 / 1M tokens
- Context window
- 66K tokens
- Max output
- 59K tokens
- Accepts
- Text, Images
- Returns
- Text, Images
Example: 1,000 requests with 1,000 input and 500 output tokens each would cost about $2.00 (1M input tokens × $0.50 + 0.5M output tokens × $3.00). Estimate your own usage.
Prices are the provider’s own per-token rates with zero markup, from our price list as of Oct 18, 2026. If a call has extra provider charges (images, audio, web search, cached prompts), you pay the reported cost.
Call it from your code
curl https://api.tokenctr.com/v1/chat/completions \
-H "Authorization: Bearer $TOKENCENTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "google/gemini-3.1-flash-image-preview", "messages": [{"role": "user", "content": "Hello!"}]}'Works with any OpenAI-compatible SDK: set the base URL to https://api.tokenctr.com/v1. Quickstart
Benchmarks
Design Arena
| Category | Rank | Elo | Win rate |
|---|---|---|---|
| Models: Graphic design | 4 | 1261 | 66.3% |
| Models: Image | 4 | 1276 | 65.1% |
| Models: Logo | 4 | 1263 | 62.9% |
Source: Artificial Analysis indexes and Design Arena results as published in OpenRouter’s model data, fetched Oct 15, 2026. Higher is better. Not measured by TokenCenter. See all rankings.