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

Nano Banana 2 (Gemini 3.1 Flash Image) 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)?

Nano Banana 2 (Gemini 3.1 Flash Image) accepts up to 131,072 tokens of context and returns up to 32,768 output tokens.

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

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)?

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) API pricing

Gemini 3.1 Flash Image, 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 advanced...

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: 131K; 33K max output

List price from OpenRouter, which passes Google's price through without markup. Refreshed hourly. Released June 18, 2026. Model id google/gemini-3.1-flash-image.

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

2 hosts serve this model. Prices are the same or higher than list; the cheapest are first.

Google AI Studio$0.5 in · $3 out · 66K ctx · 99.9% uptime 24h
Google$0.5 in · $3 out · 131K ctx · 100.0% uptime 24h

Where to buy Google credits for less

Nano Banana 2 (Gemini 3.1 Flash Image) 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) 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)

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
Nano Banana Pro (Gemini 3 Pro Image)	$2	$12	$4.50	131K
Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)	$0.25	$1.50	$0.563	66K
Gemini 3.5 Flash	$1.50	$9	$3.38	1.0M
Gemini 3.5 Flash Lite	$0.3	$2.50	$0.85	1.0M
Gemini 3.6 Flash	$0.75	$3.75	$1.50	1.0M
Gemini 3.1 Flash Lite	$0.25	$1.50	$0.563	1.0M

All Google API prices