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 $0.5 per million input tokens and $3 per million output tokens at list price.

What is the context window of Nano Banana 2 (Gemini 3.1 Flash Image Preview)?

Nano Banana 2 (Gemini 3.1 Flash Image Preview) accepts up to 65,536 tokens of context and returns up to 58,982 output tokens.

How much do 1,000 chat messages cost with Nano Banana 2 (Gemini 3.1 Flash Image Preview)?

About $2.00, assuming 1,000 input + 500 output tokens per message.

Is there a cheaper alternative to Nano Banana 2 (Gemini 3.1 Flash Image Preview)?

In the same price range, OpenAI GPT-6 Luna Pro ($0.1 / $0.5), OpenAI GPT-6 Luna ($0.1 / $0.5), Qwen Qwen3.8 Omni Flash ($0.15 / $0.47) cost less per token. Quality differs: test on your own prompts.

Where can I buy Google API credits for less?

Discount credit books resell OpenRouter usage below face value within their depth, OpenRouter adds a 5.5% card fee, and Google sells its own credits at face value. The live table on this page ranks them for $100 of usage.

Google · live price

Nano Banana 2 (Gemini 3.1 Flash Image Preview) API pricing

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...

Mid-range ($1–5 per 1M)Reasoningimage input

Input: $0.5; per 1M tokens
Output: $3; per 1M tokens
Cached input: –; per 1M tokens
Context: 66K; 59K max output

List price from OpenRouter, which passes Google's price through without markup. Refreshed hourly. Released February 26, 2026. Model id google/gemini-3.1-flash-image-preview.

What Nano Banana 2 (Gemini 3.1 Flash Image Preview) costs in practice

At list price, before any batch or caching discount.

1,000 chat messages

$2.00

1,000 input + 500 output tokens each

1,000 RAG questions

$5.50

8,000 input + 500 output tokens each

100 coding-agent steps

$2.10

30,000 input + 2,000 output tokens each, no caching

Nano Banana 2 (Gemini 3.1 Flash Image Preview) price history

No price change since we started tracking on 2026-10-01. We record prices daily; changes will show here.

Nano Banana 2 (Gemini 3.1 Flash Image Preview) price by host

One host serves this model through OpenRouter.

Google AI Studio$0.5 in · $3 out · 66K ctx · 99.9% uptime 24h

Where to buy Google credits for less

Nano Banana 2 (Gemini 3.1 Flash Image Preview) costs the same per token everywhere it's sold through OpenRouter. What changes is the price of the credits. Live quotes for $100 of usage:

#	Where you buy	You payYou pay for $100.00 of usage	vs list price	Price source
1	OrbioCardCheapest right now Credits from a discount book, plus a 5% platform fee and card processing, both included in the quote.	$85.10 incl. $2.60 card processing	-14.9%	live quote
2	smaaartCard Credits from a discount book, plus a 5% platform fee on face value. Card processing and taxes shown at checkout.	$95.00 + card processing and tax at checkout (not in this number)	-5.0%	live quote
3	Direct from the labCard Prepaid credits at face value (OpenAI, Anthropic, Google…). Taxes may apply.	$100.00 no top-up fee	list price	face value
4	OpenRouterCrypto 5% on crypto purchases. No markup on model prices.	$105.00 fees included	+5.0%	published fee
5	OpenRouterCard 5.5% on card purchases, $0.80 minimum. No markup on model prices.	$105.50 fees included	+5.5%	published fee

Disclosure: this site is run by the team behind smaaart, one of the options compared. Tables are ranked by price only, from live quotes and published fees, including when smaaart isn't first. How we compare

Nano Banana 2 (Gemini 3.1 Flash Image Preview) cost calculator

Enter your monthly tokens to price your own usage.

Model$0.5 in / $3.00 out per 1M tokens · list price, liveInput tokens / month (millions)Output tokens / month (millions)

Usage at list price$55.00/ month

Cheaper alternatives to Nano Banana 2 (Gemini 3.1 Flash Image Preview)

Other labs' models in the same price range or the one below, cheaper per token.

Model	Input / 1M	Output / 1M	Blended 3:1	Context
OpenAI: GPT-6 Luna Pro	$0.1	$0.5	$0.2	1.1M
OpenAI: GPT-6 Luna	$0.1	$0.5	$0.2	1.1M
Qwen: Qwen3.8 Omni Flash	$0.15	$0.47	$0.23	1M
Z.ai: GLM 5.3 FlashX	$0.37	$1.25	$0.59	1.0M
DeepSeek: DeepSeek V4.1 Flash	$0.03	$0.5	$0.147	1.0M
Qwen: Qwen3.8 Flash	$0.15	$0.47	$0.23	1M

Other Google models

Model	Input / 1M	Output / 1M	Blended 3:1	Context
Gemini 3.1 Pro Preview Custom Tools	$2	$12	$4.50	1.0M
Gemini 3.1 Flash Lite Preview	$0.25	$1.50	$0.563	1.0M
Gemini 3.1 Pro Preview	$2	$12	$4.50	1.0M
Gemma 4 31B	$0.09	$0.34	$0.152	262K
Gemma 4 26B A4B	$0.09	$0.3	$0.143	262K
Gemini 3.1 Flash Lite	$0.25	$1.50	$0.563	1.0M

All Google API prices