Nano Banana Pro
What is Nano Banana Pro?
Nano Banana Pro is Google's November 2025 production-grade image model, running on Gemini 3 Pro Image. It generates a single still from a prompt, optionally guided by reference images, and outputs at 1K, 2K, or 4K across ten aspect ratios from 1:1 through 21:9. The first thing you notice is text rendering. The previous generation hallucinated letterforms; Pro produces legible multi-line copy that survives a 4K render without falling apart. The second is composition discipline. Prompts that mix six or seven elements no longer collapse into a generic stock image, because the reasoning pass that runs before the diffusion step holds layout, scale, and material consistency together. It is tuned for production-ready creative, not sketches.
Key features of Nano Banana Pro
Photoreal materials and lighting
Metal, glass, fabric, skin, liquids, and translucent plastics render with the kind of micro-detail that previously meant a stylist photoshoot. Lighting stays consistent across the frame instead of fighting itself between subjects.
Legible text inside the image
Multi-line headlines, short body copy, captions, and labels render correctly across many writing systems. This is the headline upgrade over the original Nano Banana and the reason most teams move to Pro.
Ten aspect ratios, generated natively
1:1 feed posts to 9:16 reel covers and 21:9 cinematic banners. All ratios are generated natively rather than cropped from a square master.
1K, 2K, and 4K from the same prompt
1K is right for thumbnails and drafts, 2K for hero units, 4K for print and high-DPI displays. Same prompt, same references, same seed. Pick the resolution at the end of the cycle, not the start.
Reasoning over multi-subject scenes
Drop six or seven subjects into one prompt and Pro keeps scale, position, and material relationships coherent. Useful for product flat-lays, ensemble characters, infographics, and storyboards where layout matters as much as look.
Best for
Marketing posters with body copy
Multi-line headlines and short body copy render correctly inside the image, with consistent typography across resolution changes.
Photoreal product shots
Material rendering on metal, glass, and fabric is convincing enough for D2C product pages, with no stylist photoshoot required.
Character consistency across a series
Pass the same reference image set to every call. Pro keeps face, outfit, and styling stable across an A/B sequence.
Educational diagrams and infographics
Labelled callouts and short captions inside the image stay readable, useful for course material and explainer cards.
Vertical and ultra-wide social
Ten aspect ratios from 9:16 reel covers to 21:9 banners, generated natively rather than cropped from a square master.
Pre-production storyboards
The reasoning pass holds composition together when the prompt names six or more elements, useful for film and animation planning.
Use cases
Generate localized poster variants for a campaign in one batch. Same prompt, swap the language token, and Pro renders legible copy in each writing system. Build a D2C product page hero in 4K by passing the SKU shot in references and prompting for a styled scene. Lock a character before launch by pairing a fixed reference set with a seed, then tweaking the prompt without losing face or wardrobe. Storyboard a multi-subject sequence by writing each shot as a single prompt, leaning on the reasoning step to keep layout coherent when six or more subjects share a frame.
API examples
Call Nano Banana Pro from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/image/google/nano-banana-pro.
curl -X POST https://api.unifically.com/v1/tasks \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "google/nano-banana-pro",
"input": {
"prompt": "A photorealistic portrait in golden hour lighting",
"aspect_ratio": "3:4",
"resolution": "4K"
}
}'
Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished result.
FAQs
People also ask
Nano Banana Pro is Google's production-grade image generation model, powered by Gemini 3 Pro Image. It produces photorealistic stills from a text prompt, optionally guided by reference images, with a reasoning step that holds multi-subject scenes together and renders text inside the image legibly.
1K, 2K, and 4K. The default is 1K. Pick 2K when a frame is going on a hero unit or a landing page. Pick 4K for print, large displays, or anywhere the master file needs to survive heavy crop and zoom.
Ten values: 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, and 21:9. That covers vertical reels (9:16), feed posts (4:5, 1:1), landscape banners (16:9), and ultra-wide cinematic frames (21:9), all generated natively rather than cropped from a square master.
Yes. Pass an array of image URLs alongside the prompt. The model uses the references for character likeness, brand assets, product details, and overall style while it generates the new frame. References are optional. Pure text-to-image works too.
Yes. The Gemini 3 Pro Image model handles legible text rendering, including multi-line copy and mixed scripts. That is the headline upgrade over the original Nano Banana. Useful for posters, social marketing creative, and educational diagrams.
Yes. Pass an integer seed alongside the prompt and references. The same seed plus the same prompt and inputs returns the same image. Useful for A/B copy variants, regression checks, and locking in a hero shot before scaling resolution.
Same family, different generation. Pro runs on Gemini 3 Pro Image, adds resolution control (1K, 2K, 4K), and a seed parameter. The original Nano Banana lacks resolution control and seed, and aspect_ratio is required.
