Knowledge infographic
16:9A detailed care infographic for a String of Turtles houseplant, with a botanical illustration plus legible labels covering origin, watering, light, and growth.
Nano Banana Pro
ID:
google/nano-banana-proNano Banana Pro image generation API by Google — Gemini 3 Pro with sharpest text rendering, 4K output, and highest fidelity in the family.
Text to imageImage editingReference images4KText rendering
Input
OutputView all
Output will appear here
Pricing
1K
$0.06
2K
$0.06
4K
$0.11
Examples
Text rendering
16:9A woodchopping scene where the phrase "HOW MUCH WOOD WOULD A WOODCHUCK CHUCK" is sculpted in 3D from stacked logs.
Complex composition
16:9Fourteen distinct fluffy creatures sitting together on a sofa watching a vintage TV, each rendered with consistent identity and detailed fur.
Overview
Nano Banana Pro is Google's highest-fidelity AI image generator, released in November 2025. Built on Gemini 3 Pro, it delivers the sharpest text rendering and most detailed material reproduction in the lineup. It supports 4K output, 11 aspect ratios (including auto), and up to 8 reference images at 30 MB each. The trade-off is higher latency and cost compared to the Flash-based models. The model is available through the Nano Banana Pro API for programmatic image generation.
Use cases
Production-quality imagery for print and packaging. Technical diagrams, infographics, and documentation with legible embedded text. Product photography requiring sharp material detail and consistent lighting. High-fidelity creative work where output quality justifies the longer generation time.
Inputs
All parameters are passed in the input object of the run request.
| Parameter | Required | Description |
|---|---|---|
| prompt | Yes | Text description (1–10000 chars) |
| aspect_ratio | No | Output aspect ratio. Default 1:1. Supports 11 ratios including auto |
| resolution | No | Output resolution. Default 1K. Options: 1K, 2K, 4K |
| image_urls | No | Up to 8 reference images (max 30 MB each) for guided generation |
Prompt tips
Nano Banana Pro prompts for text-heavy deliverables
Nano Banana Pro has the sharpest text rendering in the family. If your image includes dense or small text — ingredient labels, legal disclaimers, infographic callouts — this is the model to use for the final version.
Pair 4K with detailed scene descriptions
At 4K, the model renders fine textures (wood grain, fabric weave, skin pores) with noticeably more clarity. Give it enough descriptive detail to take advantage of the resolution.
Limitations
- Higher latency than Nano Banana or Nano Banana 2 due to Gemini 3 Pro processing
- Pricing reflects the higher compute cost of Pro-level inference
- Fewer reference images (8) than Nano Banana 2 (14)
- 11 aspect ratios — no ultra-wide options like 8:1 or 1:8
- Prompt length capped at 10,000 characters
FAQ
What aspect ratios does Nano Banana Pro support?
Eleven options: 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9, and auto. The default is 1:1.
Nano Banana Pro vs Nano Banana 2: which should you choose?
Nano Banana Pro uses Gemini 3 Pro for higher fidelity, especially in text rendering and material detail. Nano Banana 2 uses Gemini 3.1 Flash for faster generation, more aspect ratios (15 vs 11), and more reference images (14 vs 8). Choose Pro for quality and sharp text; choose Nano Banana 2 for speed, flexibility, and ultra-wide ratios.
Nano Banana Pro vs Midjourney
Nano Banana Pro is API-first and built for accurate text rendering, 4K output, and reference-guided editing. Midjourney is optimized for artistic style and has a large community prompt library, but it is subscription-priced and its text rendering is less precise. Pick Nano Banana Pro for infographics, UI mockups, product photography, and programmatic workflows; pick Midjourney for stylized illustration and concept art.
Nano Banana Pro vs Imagen 4
Both come from Google. Nano Banana Pro runs on Gemini 3 Pro and is designed for API-first workflows: up to 8 reference images for guided editing, 11 aspect ratios including auto, and 4K output in a single API call. Imagen 4 also produces high-quality photorealistic images. Choose Nano Banana Pro when your workflow depends on reference-image conditioning, a wide choice of aspect ratios, or 4K output through one API.
How to use Nano Banana Pro
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-pro" and an input object containing prompt (required), aspect_ratio, resolution, and up to 8 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 Pro cost?
Nano Banana Pro 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 Pro free?
It is pay-as-you-go rather than free, but new Runbase accounts receive free credit on signup that works toward Nano Banana Pro and other models. Once the credit is used up, you pay per generation at the rates shown in the Pricing section.
What resolutions are available?
1K (default), 2K, and 4K. The 4K tier has a higher price point than 1K and 2K.