Nano Banana 2 (Gemini 3.1 Flash Image Preview)

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Data updated on September 30, 2026· 217 models

GoogleBanana 2

Gemini 3.1 Flash Image Preview, a.k.a.

Reasoning estimated
Speed estimated
Input
Output
Context
66 K tokens
Max output
59 K
Input, $ per 1M tokens
$0.500
Output, $ per 1M tokens
$3.00
Cache read, $ per 1M
$0.050
Batch (input / output)
—
Tool calling
No
Released
02/26/2026
Knowledge cutoff
2025-01
API id
google/gemini-3.1-flash-image-preview

Summary from the data

Nano Banana 2 (Gemini 3.1 Flash Image Preview) is a Google model available by API since 02/26/2026. It costs $0.500 per million input tokens and $3.00 per million output tokens, accepts 66 K tokens of context and generates up to 59 K tokens per response. Input: image, text; output: image, text. It has a reasoning mode. It does not support tool calling. With 10,000 requests a month of 1,500 input and 400 output tokens it would cost about $19.50 a month.

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What would your product cost?

Estimate the monthly cost with your app's real volume. List prices, no cache or batch discounts.

Nano Banana 2 (Gemini 3.1 Flash Image Preview)
$19.50/mo

The 6 cheapest for this scenario (chat, last 12 months)

  1. 1Lyria 3 Pro Preview Google$0.00
  2. 2Lyria 3 Clip Preview Google$0.00
  3. 3Qwen3.7 Flash Qwen$0.97
  4. 4DeepSeek V4 Flash 0731 DeepSeek$1.55
  5. 5Ministral 3 3B 2512 Mistral$1.90
  6. 6Qwen3.5-Flash Qwen$2.02

Frequently asked questions

How much does Nano Banana 2 (Gemini 3.1 Flash Image Preview) cost per million tokens?

Nano Banana 2 (Gemini 3.1 Flash Image Preview) costs $0.500 per million input tokens and $3.00 per million output tokens (USD, list price). Cache read: $0.050. Batch tier: not published.

What context window does Nano Banana 2 (Gemini 3.1 Flash Image Preview) have?

Nano Banana 2 (Gemini 3.1 Flash Image Preview) accepts 66 K tokens of context per request and generates up to 59 K tokens per response.

Does Nano Banana 2 (Gemini 3.1 Flash Image Preview) accept images, audio or files?

Input: image, text. Output: image, text.

Does Nano Banana 2 (Gemini 3.1 Flash Image Preview) have a reasoning mode and tool calling?

It has a reasoning mode. It does not support tool calling.

When was Nano Banana 2 (Gemini 3.1 Flash Image Preview) released and what is its knowledge cutoff?

Nano Banana 2 (Gemini 3.1 Flash Image Preview) has been available by API since 02/26/2026. Knowledge cutoff: 2025-01.

What would an app built on Nano Banana 2 (Gemini 3.1 Flash Image Preview) cost?

With 10,000 requests a month of 1,500 input and 400 output tokens, Nano Banana 2 (Gemini 3.1 Flash Image Preview) would cost about $19.50 a month at list price, without cache or batch discounts.

What is the API id of Nano Banana 2 (Gemini 3.1 Flash Image Preview)?

The id is google/gemini-3.1-flash-image-preview. It is the name passed in the model parameter of the API (or on OpenRouter).

Where do the prices come from and how often are they updated?

From the public catalogs of OpenRouter, models.dev and LiteLLM, which publish each provider's list prices. They sync once a day and the last update date is shown above the comparison.

What does price per million tokens mean?

It is what the provider charges per million tokens you send (input) or the model generates (output). A token is roughly 4 characters. Output almost always costs more than input.

Sources: OpenRouter, models.dev and LiteLLM. Prices in USD per million tokens, list price, no volume discounts. Prompt tokens are an estimate; each provider's tokenizer may differ.