DIY infographic
16:9High-quality flat lay photography creating a DIY infographic that simply explains how the water cycle works, with hand-drawn arrows and labels.
Nano Banana 2
ID:
google/nano-banana-2Nano Banana 2 image generation API by Google — Gemini 3.1 Flash with 4K output, 15 aspect ratios, and character consistency for up to 5 characters.
Text to imageImage editingReference images4KText rendering
Input
OutputView all
Output will appear here
Pricing
1K
$0.04
2K
$0.06
4K
$0.09
Examples
Labeled triptych
16:9A three-panel comic-style comparison of Cumulus, Stratus, and Cirrus clouds in dramatic skies, each panel with a bold legible label.
Character consistency
16:9A four-panel collage of the same kangaroo character in a consistent outfit across vacation scenes — boating, a café, a hotel room, and a bouncy castle.
Overview
Nano Banana 2 is the most versatile AI image generator in Google's Nano Banana family, released in February 2026. Built on Gemini 3.1 Flash, it delivers Pro-level quality at Flash speed. It supports 15 aspect ratios — the widest selection available — including ultra-wide options (8:1, 1:8) and auto. Output resolution goes up to 4K. It accepts up to 14 reference images at 30 MB each and can maintain character consistency for up to 5 distinct characters across images. The model is available through the Nano Banana 2 API for programmatic image generation.
Use cases
High-volume brand asset production at scale. Character-consistent workflows — comics, storyboards, mascot campaigns. Infographics and diagrams with accurate text rendering. Ultra-wide banners and panoramic compositions using 8:1 or 21:9 ratios. Reference-guided editing with up to 14 images.
Inputs
All parameters are passed in the input object of the run request.
| Parameter | Required | Description |
|---|---|---|
| prompt | Yes | Text description (1–20000 chars) |
| aspect_ratio | No | Output aspect ratio. Default 1:1. Supports 15 ratios including ultra-wide (8:1, 1:8) and auto |
| resolution | No | Output resolution. Default 1K. Options: 1K, 2K, 4K |
| image_urls | No | Up to 14 reference images (max 30 MB each) for guided generation |
Prompt tips
Nano Banana 2 prompts for character consistency
When using character consistency, give each character a distinct visual description and refer to them consistently across prompts. "The red-haired fox in a blue scarf" should stay the same phrase each time.
Match resolution to use case
1K is fast and cheap for iteration. 2K balances quality and cost. Reserve 4K for final deliverables — the price difference is significant.
Use ultra-wide ratios deliberately
8:1 and 1:8 are powerful for banners and vertical scrolls, but they require prompts that fill the space. Describe a scene with enough elements to avoid sparse compositions.
Limitations
- Ultra-wide ratios (8:1, 1:8) may produce stretched or sparse compositions
- Flash-speed trade-off: slightly less reasoning depth than Pro on complex prompts
- Character consistency limited to 5 distinct characters
- Maximum 14 reference images per request, 30 MB each
- Prompt length capped at 20,000 characters
- Image generation only - Nano Banana 2 does not generate video
FAQ
What aspect ratios does Nano Banana 2 support?
Fifteen options: 1:1, 1:4, 1:8, 2:3, 3:2, 3:4, 4:1, 4:3, 4:5, 5:4, 8:1, 9:16, 16:9, 21:9, and auto. The default is 1:1.
What resolutions are available?
1K (default), 2K, and 4K. Each resolution tier has a different price point.
How does character consistency work?
Describe up to 5 characters with distinct visual traits and the model will maintain their appearance across generated images. Use reference images to further anchor each character's look.
Nano Banana 2 vs Nano Banana Pro: which should you choose?
Nano Banana 2 runs on Gemini 3.1 Flash - fast, with 15 aspect ratios (including ultra-wide 8:1 and 1:8), 4K output, and up to 14 reference images. Nano Banana Pro runs on Gemini 3 Pro for sharper text rendering and higher fidelity, but with 11 aspect ratios, 8 reference images, and higher latency. Choose Nano Banana 2 for speed, flexibility, and ultra-wide; choose Nano Banana Pro for the sharpest text and detail.
Nano Banana 2 vs GPT Image 2
Nano Banana 2 is Google's versatile model: 15 aspect ratios, 4K output, character consistency for up to 5 characters, and up to 14 reference images. GPT Image 2 is OpenAI's flagship with built-in reasoning and multilingual text rendering, but fewer aspect ratios (10) and reference images (4). Choose Nano Banana 2 for ultra-wide ratios, character consistency, and more reference images; choose GPT Image 2 for reasoning-driven composition and CJK text rendering.
How to use Nano Banana 2
Two ways on Runbase: use the Playground at the top of this page to generate instantly with a prompt and optional reference images, or call the API by POSTing to /api/v1/runs with model: "google/nano-banana-2" and an input object containing prompt (required), aspect_ratio, resolution, and up to 14 image_urls. New accounts receive free credit on signup to try it. See the API tab for full code samples.
How much does Nano Banana 2 cost?
Nano Banana 2 is priced per generated image across three resolution tiers: 1K (cheapest), 2K, and 4K (highest). See the Pricing section above for current per-image rates.
Is Nano Banana 2 free?
It is pay-as-you-go rather than free, but new Runbase accounts receive free credit on signup that works toward Nano Banana 2 and other models. Once the credit is used up, you pay per generation at the rates shown in the Pricing section.