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Nano banana Pro — 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 unified endpoint with the same JSON shape as every other reApi model.

Highlights
1K / 2K / 4K · up to 4 images per request
Best for
High-detail renders, marketing visuals
Input
Text, plus reference images
Output
Up to 4 images per request
Input

Free text · required · detailed prompts produce better results

Ten ratios from 1:1 to 21:9

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

1–4 images per request

0/16 files

Up to 14 · public HTTPS URLs only

Result

Try one of these prompts

What is the Gemini 3 Pro Image Preview API?

Gemini 3 Pro Image Preview is Google's high-end image model, exposed on reAPI as one async endpoint that covers both text-to-image and image editing with up to 14 reference images. Every request takes a prompt of up to 4,000 characters, one of 10 aspect ratios and a 1K / 2K / 4K resolution tier, and returns 1 to 4 images, billed per image.

Nano banana Pro 4K sample renders

What you can build with this model

Real-world workflows and production use cases you can build and ship with this model.

4K hero shot generated with Nano banana Pro

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

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

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.

Pricing

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

First test cost
$0.03333 credits

One sample at the cheapest tier (1 image).

Testing budget guide
Add credits
$10
≈ 310 tests
$50
≈ 1552 tests
$100
≈ 3105 tests
ModelCategoryPrice
Default1K / 2K
$0.033
33 credits · 1 image
4K
$0.035
35 credits · 1 image
Official Google1K / 2K
$0.124
124 credits · 1 image
4K
$0.221
221 credits · 1 image

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 equals $0.001 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.

Integrate Nano banana Pro in three steps

  1. 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
  2. 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
  3. 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
docs/api/gemini-3-pro-image-preview

API reference

Drop-in code and the full parameter table.

View full reference
curl -X POST https://reapi.ai/api/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-3-pro-image-preview",
    "prompt": "ancient castle beneath a starry sky, cinematic",
    "size": "16:9",
    "resolution": "2K"
  }'

Parameter validation failed

Rejected synchronously with the failing field named. Check enum values, ranges, and URL fields — nothing is charged.

Authentication or balance issue

401 means a missing or invalid Bearer key; 402 means the reserve exceeds your balance. Manage keys and credits in the console.

Content or material rejected

Reference material and outputs pass automated moderation. Rejected tasks fail with a clear error and a full refund.

Task failed or timed out

A task that reaches a failed state is never charged — the reserve refunds automatically. Keep the task id and retry when ready.

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 unified 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.

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

Try Nano banana ProView API Docs