Nano Banana 2 (Gemini 3.1 Flash Image Preview)
by GoogleReleased Feb 26, 2026
google/gemini-3.1-flash-image-preview- Reads images
- Answers in a JSON schema
- Reasons before it answers
- Searches the web
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. It combines...
- Input / 1M tokens
- $0.60
- Output / 1M tokens
- $3.60
- Context
- 66K
- Longest answer
- 59K
What it costs
What each call is charged to the token's AI credit.
| Billed for | You pay |
|---|---|
| Input tokens | $0.60 / 1M |
| Output tokens | $3.60 / 1M |
| Each web search | $0.02 |
A typical call
A short chat turn: 2,000 tokens in, 500 out.
- per call
- $0.003
- calls per $20
- 6,666
What it can do
From its listing. The router passes every field through.
- Reads imagesYes
- Reads files and PDFsNo
- Hears audioNo
- Calls toolsNo
- Answers in a JSON schemaYes
- Reasons before it answersYes
- Searches the webYes
- Caches long promptsNo
- Draws imagesYes
Call it
Any router key works, in the format your SDK already speaks.
import OpenAI from "openai";const ai = new OpenAI({ baseURL: "https://relayfor.si/api/v1", apiKey: process.env.RELAYFOR_ROUTER_KEY,});const reply = await ai.chat.completions.create({ model: "google/gemini-3.1-flash-image-preview", messages: [{ role: "user", content: "Welcome the 1,000th holder in one line." }],});Specifications
What its maker and providers list for it.
- Reads
- Images and Text
- Writes
- Images and Text
- Context
- 65,536 tokens
- Longest answer
- 58,982 tokens
- Reasoning effort
- minimal to high
- Released
- Feb 26, 2026
- Moderation
- None
Request fields
The fields its providers accept, passed through as you send them.
- include_reasoning
- max_tokens
- reasoning
- reasoning_effort
- response_format
- seed
- structured_outputs
- temperature
- top_p
Questions
How much does Nano Banana 2 (Gemini 3.1 Flash Image Preview) cost?
$0.60 per million input tokens and $3.60 per million output tokens, paid from the token's AI credit. A call of 2,000 tokens in and 500 out costs about $0.003.
How do I call Nano Banana 2 (Gemini 3.1 Flash Image Preview)?
Make a router key for one of your tokens on the dashboard, point any OpenAI or Anthropic SDK at https://relayfor.si/api/v1 and send the model id google/gemini-3.1-flash-image-preview. The token's AI credit pays for each call.
How long a prompt can Nano Banana 2 (Gemini 3.1 Flash Image Preview) take?
Up to 65,536 tokens of context, and up to 58,982 tokens in one answer.
Are my prompts stored?
No. The RFS Router passes each call through and keeps only its token counts and cost, for the token's usage page.
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