Nano Banana 2 (Gemini 3.1 Flash Image): pricing, context and benchmarks

What you need to know about Nano Banana 2 (Gemini 3.1 Flash Image)

Nano Banana 2 (Gemini 3.1 Flash Image) was released by Google (United States) on June 18, 2026. It accepts images and text as input and produces images and text. Its context window reaches 131,072 tokens, larger than 29 % of the models in the registry, and it can write up to 32,768 tokens in one go.

It has been available for about 4 months, long enough for its prices and scores to have settled.

Nano Banana 2 (Gemini 3.1 Flash Image) pricing

On OpenRouter, Nano Banana 2 (Gemini 3.1 Flash Image) costs $0.5 per million input tokens and $3 per million output tokens. Counting three tokens read for every token written, its average price is $1.125 per million, more expensive than 61 % of paid models (1.5 times the median of $0.76).

A concrete example: a task that sends 2,000 tokens (about 1,500 words) and receives a 500-token answer costs $0.0025. At 1,000 tasks a day, budget $75 a month. The price calculator redoes this with your own volumes.

Performance and benchmarks

Epoch AI does not yet publish a capabilities index for Nano Banana 2 (Gemini 3.1 Flash Image). We therefore show no made-up performance rating: only price, context and features count towards its score.

Features, privacy and local use

• It does not support tool calling: it is not suited to driving an AI agent that has to act.
• It can answer in an enforced JSON format (structured outputs).
• It is a reasoning model: it "thinks" before answering, which helps on hard tasks but uses more output tokens.

Its weights are not published: it can only be used through the Google API or a broker such as OpenRouter, which means sending your data off your machines.

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