Nano Banana Pro — professional images up to 4K
Nano Banana Pro is Google's Gemini 3 Pro Image model. It thinks through the layout before it draws, handles dense text and renders 1K to 4K. From $0.03 per image on Standard.
- Text to image
- Image editing
- 1K to 4K
- Built-in thinking
- Up to 14 references
- Accurate text
Try Nano Banana Pro before you write any code
Run Nano Banana Pro with the exact request your code will send. Every parameter the API takes is here.
gemini-3-pro-image-official$90.00 / 1M image output tokens
Describe an image, add references if you have them, and submit once. The result appears when the task completes.
What to create or change. Subject, setting, lighting and style.
Reference images the model should follow. Files are uploaded and sent as URLs.
Up to 14, sent as fileData URLs.
Default matches your first reference, otherwise 1:1.
Output resolution. 1K is the default.
Image only, or image with a short text reply.
Standing rules for the model, such as a house style.
Blocking threshold for this category.
Greyed-out options relax content filtering. They are available through the API only, not in the playground.
Blocking threshold for this category.
Greyed-out options relax content filtering. They are available through the API only, not in the playground.
Blocking threshold for this category.
Greyed-out options relax content filtering. They are available through the API only, not in the playground.
Blocking threshold for this category.
Greyed-out options relax content filtering. They are available through the API only, not in the playground.
0–2. Leave empty for the model default.
0–1. Leave empty for the model default.
Whole number, 1 or more.
Whole number. Reuse it to reproduce a result more closely.
Caps text and thinking output.
One per line, up to 5.
Only 1: one request returns one image.
How many tokens each reference uses. Lower is cheaper.
Return the model's thought summary with the image.
IMAGE_JPEG is the one documented value.
Applies only when aspect ratio above is Default; when both are set, aspect ratio wins.
Applies only when image size above is Default; when both are set, image size wins.
Estimated at current rates from the image tokens of the selected size plus a measured sample of text and thinking tokens. Reference inputs add a little on Official.
Try one of these prompts
Sample images generated with Nano Banana Pro through this API
Nano Banana Pro pricing
Two ways to pay for Nano Banana Pro. Standard is one flat price per image at any size. Official bills the tokens each render reports, where 1K and 2K cost the same and 4K costs more.
- Official
- $0.10304/image
- Standard
- $0.03/image
- Official
- 194images
- Standard
- 666images
Both prices come from the rates that bill your account. Failed requests are not charged.
Official estimates use the image tokens Google publishes for each size, plus a measured sample of 246 text and thinking tokens and 14 prompt tokens.
Nano Banana Pro cost by image size
Google publishes a fixed image-token count per size: 1K and 2K use the same count. Official prices below add a typical thinking allowance.
| Image size | Image tokens | Price · Official | Price · Standard |
|---|---|---|---|
| 1K | 1,120 | $0.10304 | $0.03 |
| 2K | 1,120 | $0.10304 | $0.03 |
| 4K | 2,000 | $0.18224 | $0.03 |
Standard is one flat price per image at every size. Official follows the image tokens, so larger sizes cost more.
Price your own Nano Banana Pro request
Pick a size and watch the figure. It is computed from the live rate and the image tokens Google publishes for each size, so it moves when the price does.
A pre-submit estimate. Standard bills each delivered image; Official bills image output, text and thinking output, and input at their own rates.
| Item | How it is measured | Rate | Billing |
|---|---|---|---|
| Official · Image output | Image tokens reported for the render | $90.00 / 1M$120.00 / 1M | Charged from real usage |
| Official · Text and thinking output | Text and thinking tokens reported for the render | $9.00 / 1M$12.00 / 1M | Charged from real usage |
| Official · Input | Prompt and reference tokens | $1.50 / 1M$2.00 / 1M | Charged from real usage |
| Standard · Per image | Each delivered image, any size | $0.03 /image$0.04 /image | Charged when the image is delivered |
| Failed requests | Any task that ends failed | Free | Nothing is charged |
What is Nano Banana Pro?
Nano Banana Pro is the nickname of Gemini 3 Pro Image, which Google calls its premium choice for the most complex visual tasks. It reasons about the composition before rendering, which makes it strong at complex scenes, infographics and readable text.
On SeedRouter you call Nano Banana Pro with Google's own generateContent request body. Submit once, get a task ID, and collect a hosted image URL when the task completes.
Google model name: Gemini 3 Pro Image · Stable model ID: gemini-3-pro-image · Input limit: 65,536 tokens.
Two ways to use Nano Banana Pro
Call the API from your backend, or hand the job to a coding agent.
Call the API
Send the Nano Banana Pro request from your server, keep the task ID, and read the finished image from the task.
- 1Create an API key
- 2POST the request body
- 3Poll the task until it completes
Let an agent do it
Copy a ready prompt into Claude Code, Codex or Cursor. It asks before spending and downloads the result.
- 1Copy the prompt
- 2Fill in what you want
- 3Approve the request
What Nano Banana Pro is good at
The model to reach for when the first render has to be the final one.
Plans before it draws
Nano Banana Pro works out layout and logic first, so multi-part prompts land in fewer tries.
Built for text
Google lists legible, stylized text for infographics, menus and diagrams among its strengths, so labels and headlines are its home ground.
Real 4K
Nano Banana Pro renders print-ready 4K, and 2K costs the same as 1K on Official.
Up to 14 references
Give Nano Banana Pro six object references, five character references and three style references in one request.
Precise edits
Change one element with Nano Banana Pro and keep the rest of the image intact.
Consistent characters
Nano Banana Pro keeps up to five people recognisable across a series.
What teams use Nano Banana Pro for
Infographics
Nano Banana Pro turns notes into diagrams and explainers with legible labels.
Print and packaging
Nano Banana Pro renders 4K artwork for posters, packaging and large displays.
Campaign sets
Keep one cast of characters across a whole campaign with Nano Banana Pro.
Architecture and interiors
Nano Banana Pro concept renders with believable light and materials.
Premium product shots
Nano Banana Pro hero images where every reflection matters.
Brand-style work
Match a look in Nano Banana Pro from up to three style references.
Start with Nano Banana Pro in four steps
- 01
Create a key
Sign in, top up any amount, and create an API key. Credits never expire.
- 02
Send one request
POST the Nano Banana Pro body to /v1/images/generations with your prompt and any reference URLs.
- 03
Poll the task
Keep the task ID and check it every few seconds until the status is completed.
- 04
Download the image
Save the hosted image URL from the task output to your own storage.
Nano Banana Pro at a glance
The facts that decide whether Nano Banana Pro fits the job.
| Feature | Nano Banana Pro |
|---|---|
| Output sizes | 1K, 2K, 4K |
| Aspect ratios | 10 (9:16 to 21:9) |
| References | Up to 14 |
| Input types | Text and image |
| Thinking | Always on; optional thought summaries |
| Billing | Per image (Standard) or per token (Official) |
Need 512px drafts, extreme aspect ratios or video input? See Nano Banana 2.
What to know before you start
Slower than Flash
Thinking takes time. In our runs 1K Nano Banana Pro images finished in under a minute; 4K takes longer.
One image per request
Send several Nano Banana Pro requests for a batch.
No Google Search grounding yet
Nano Banana Pro requests with tools are refused for now.
Images and text only
Nano Banana Pro does not read video or PDF. Send references as public image URLs.
Why run Nano Banana Pro on SeedRouter
Two ways to pay
Pick Standard for one flat price per Nano Banana Pro image, or Official to pay for the tokens each render reports. Same key, same request body.
Failed requests are free
If a task ends failed, nothing is charged. You only pay for images that are delivered.
Credits never expire
Top up once and use the balance whenever you need it. No subscription.
Hosted results
Finished images come back as URLs on our CDN. Keep a copy of anything you need long term.
One key for every model
The same key and balance work for the other image models in the catalogue.
Other image models on SeedRouter
Same key, same balance, same task API.
Create and edit images with GPT Image 2 on SeedRouter. Use text prompts, reference images and transparent backgrounds, with a live playground and usage-based pricing.
View pricingGenerate and edit images with GPT Image 2.5 Flare or Sunburst on SeedRouter. Six quality steps up to max, transparent backgrounds, a live playground and pay-as-you-go pricing.
View pricingCreate and edit images with Nano Banana 2 (Gemini 3.1 Flash Image): 512px to 4K, 14 aspect ratios, up to 14 references. Pay per image or per token.
View pricingCreate and edit images with Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image), Google's fastest and cheapest image model: 1K output, 14 aspect ratios.
View pricingNano Banana Pro guides
Practical guides to choosing, pricing and integrating the model.
Is Nano Banana free? What the Gemini app and the Gemini API include for Nano Banana 2 and Nano Banana Pro without paying, and when you start paying.
Use the Nano Banana 2 API step by step: create a key, send a generateContent request, poll the task, add reference images, and let a coding agent run it.
Compare Nano Banana 2, Nano Banana Pro and Nano Banana 2 Lite on image size, aspect ratios, references, thinking and billing, and pick one per job.
Current Nano Banana API pricing for Nano Banana 2, Pro and 2 Lite: flat per-image and token billing, cost by resolution, and when each billing fits.
Nano Banana Pro FAQ
What is Google Nano Banana Pro?+
Nano Banana Pro is Google's name for Gemini 3 Pro Image, its image model for professional asset production. It thinks through each prompt before rendering and outputs 1K to 4K images with accurate text and up to 14 references.
Is Nano Banana Pro free?+
Google offers Nano Banana Pro in its own apps. The API is paid. On SeedRouter you top up once, pay per image with no subscription, and failed requests are free.
How expensive is Nano Banana Pro?+
A Nano Banana Pro image costs $0.03 on Standard at any size. On Official you pay for the tokens each render reports; a typical 1K or 2K render comes to about $0.10304, and 4K uses more image tokens.
Nano Banana Pro or Nano Banana 2: which should I use?+
Use Nano Banana Pro for complex compositions, infographics, dense text and 4K finals. Use Nano Banana 2 for speed, 512px drafts, extreme aspect ratios and video or PDF input.
Is Nano Banana Pro actually good?+
Google positions Nano Banana Pro as its professional image model, built for complex instructions and accurate text. Run your own prompt in the Playground and judge the result before you commit.
How do I get an API key for Nano Banana Pro?+
Create a SeedRouter account, add credit, and create a key in the dashboard. The same key works for Nano Banana Pro and every other model here.
Does 4K cost more with Nano Banana Pro?+
On Standard, no: every image is one flat price. On Official, 4K uses 2,000 image tokens against 1,120 for 1K and 2K, so it costs more.
Is there a daily limit on Nano Banana Pro?+
Your SeedRouter balance has no daily image quota. Generate as long as you have credit; a request that fails is not charged.
Render your first Nano Banana Pro image
Try it in the Playground, then move the same request into your code.