How does Nano banana Pro pricing work?

Credit-based: 1 credit equals $0.001 USD. Nano banana Pro on the default `gemini-3-pro-image-preview` id runs 53 credits per image at 1K or 2K and 58 credits at 4K. The `-official` id runs 124 credits at 1K or 2K and 221 credits at 4K. Multiply by the n parameter (1–4) — a four-image 4K batch on the default id costs 232 credits total.

What's the difference between Nano banana and Nano banana Pro?

Nano banana (gemini-2.5-flash-image-preview) renders at 1K only and is the cheapest, fastest variant. Nano banana Pro (gemini-3-pro-image-preview) supports 1K, 2K, and 4K with higher per-image fidelity. If you only need 1K drafts, Nano banana is the right call; if you need print or hero shots, switch to Nano banana Pro on the same endpoint.

Does Nano banana Pro support image-to-image?

Yes. Pass URLs in image_urls and Nano banana Pro switchereAPIimage-to-image. Up to 14 reference images per call — combine subject, scene, and style references in one prompt. URLs must be public HTTPS (no base64 or data: URIs); upload to your own R2 / S3 / OSS first.

What aspect ratios does Nano banana Pro support?

Ten ratios via the size field: 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, and 21:9. For extreme banner ratios like 1:8 or 8:1, use Nano banana 2 (gemini-3.1-flash-image-preview) instead — same key, same endpoint.

How fast is Nano banana Pro at 4K?

A typical 1K render finishes in 30–60 seconds. 2K adds ~30 seconds. 4K can take 90–120 seconds on Nano banana Pro because the model has more pixels to commit. The playground streams live status while the task runs, and the same status flag is on /api/v1/tasks/:id for your own progress UI.

What's the difference between the two Nano banana Pro model ids?

The default `gemini-3-pro-image-preview` routes through reApi's optimized path — the cheapest way to call Nano banana Pro. The `-official` id routes directly to Google's endpoint and is priced higher; pick it when an enterprise contract or compliance review requires the official routing. Both share the same parameter shape.

Where is the full Nano banana Pro API reference?

The complete parameter list, validation rules, error codes, and runnable examples for Nano banana Pro live at /docs/gemini-3-pro-image-preview. Both model ids share the same endpoint — only the model field differs — so a single integration covers both Nano banana Pro variants.

Nano banana Pro API — 4K Gemini 3 Pro Image, One Endpoint

Nano banana Pro is the community name for Google's Gemini 3 Pro Image. Nano banana Pro renders 1K, 2K, and 4K through reApi's OpenAI-compatible endpoint with the same JSON shape as every other reApi model.

Model type:

Price

est$0.053– $0.058per image

Per-call billing — the cheapest way to call Nano banana Pro.

Same API endpoint. The model parameter selects the variant.

Try Nano banana Pro View API Docs

01playground

InputsPOST /api/v1/images/generations

Prompt*

Free text · required · detailed prompts produce better results

Provide a prompt or at least one reference image / video / frame.

Size

Ten ratios from 1:1 to 21:9

Resolution

1K / 2K / 4K — pick higher tiers for print or hero shots

Count

1–4 images per request

Reference images

Drag images here or click to upload

Up to 14 · public HTTPS URLs only

Outputidle

try one of these prompts

02use cases

What you can build

Real workflows powered by this model.

4K hero shot generated with Nano banana Pro

01/case

Ship 4K hero shots without a photo crew

Nano banana Pro renders at 4K — large enough for the homepage hero, the campaign banner, the press kit. Describe the shot, set resolution to 4K, pick a widescreen ratio, and the image lands in seconds. The same prompt template that drafted at 1K can scale up to 4K when the asset goes to print or to a retina display, with Nano banana Pro keeping the composition and color story stable across resolutions.

Render at 4K

Iteration to finalization workflow with Nano banana Pro

02/case

Iterate at 1K, finalize at 4K

Spin a hundred 1K drafts on Nano banana Pro to lock the concept, then re-run the winner at 4K for production. The default `gemini-3-pro-image-preview` id is tuned for fast iteration; the `-official` id matches Google's direct-routing behavior when an enterprise contract or compliance review needs that guarantee. Same JSON body, same n=4 batches, only the model id differs between Nano banana Pro variants.

Reference-driven composition with Nano banana Pro

03/case

Compose product scenes from references

Pass up to 14 references — product cutout, environment plate, brand mood frames — and Nano banana Pro fuses them into one composition. At 4K the texture detail holds up under print zoom; at 2K the file is light enough for ad-network creative pipelines. URLs must be public HTTPS — upload to your own R2 / S3 / OSS first, then pass the URL.

03pricing

Pricing

Credit-based — 1 credit = $0.001 USD. Pay only for completed generations.

Mode	Category	Unit	Price
Default
└	1K / 2K	1 image	$0.053 53 credits
└	4K	1 image	$0.058 58 credits
Official Google
└	1K / 2K	1 image	$0.124 124 credits
└	4K	1 image	$0.221 221 credits

05why

Why reAPI

1K to 4K from one endpoint

Nano banana Pro covers the full resolution ladder. Send `gemini-3-pro-image-preview` for the default routing or `gemini-3-pro-image-preview-official` for Google's official endpoint — both hit `/api/v1/images/generations` with the same JSON shape. The resolution field flips between 1K, 2K, and 4K without a refactor; the rest of your client code stays put.

Credits in, image out — no surprises

1 credit equareAPI.001 USD. Nano banana Pro at 1K or 2K costs the same per-image rate; 4K is priced higher to match the upstream cell. The estimator on this page costs your exact configuration before submit, so the Nano banana Pro charge in the dashboard equals what you saw at request time. No metering surprises, no minimum commitment, no monthly platform fee.

Async-first for production stacks

Submit a Nano banana Pro task, get a task_id back, poll until done. 4K renders take longer than 1K; the async pattern means your handler never blocks while the model works. Failed and moderated requests are not charged. Drop Nano banana Pro into the same task plumbing you use for every other reApi model — the lifecycle is identical.

06quickstart

Integrate Nano banana Pro in three steps

step 01
Create an API key
Sign up at reApi and grab a key. Free signup credits cover dozens of Nano banana Pro generations, enough to ship the first 4K hero or campaign asset before topping up.
Open
step 02
Submit a generation
POST to /api/v1/images/generations with model: gemini-3-pro-image-preview, a prompt, and optional size / resolution / n. Nano banana Pro returns a task_id immediately — your handler is free to move on.
Open
step 03
Poll the result
GET /api/v1/tasks/:id until status is completed. The Nano banana Pro response carries image URLs on our CDN, stable for 24 hours; mirror to your own storage if you need them longer.
Open

07faq

Frequently asked questions

Common questions about this model.

Nano banana Pro is the community nickname for Google's Gemini 3 Pro Image (formal id: gemini-3-pro-image-preview). It is the higher-fidelity sibling of the original Nano banana — same Gemini family, same OpenAI-compatible endpoint shape on reApi, but with 1K, 2K, and 4K resolution support. Use Nano banana Pro when you need print-grade detail, hero shots, or scaled-up campaign creative.

09api reference

docs/api/gemini-3-pro-image-preview

API reference

Drop-in code and the full parameter table.

View full reference

POST /api/v1/images/generations
Authorization: Bearer $REAPI_API_KEY
Content-Type: application/json

{
  "prompt": "..."
}

start building

Ready to ship?

Try it in the playground or grab an API key to integrate now.

Try Nano banana Pro Get API key

What you can build

Real workflows powered by this model.

01/case