Nano Banana Pro is billed per generated image, starting at $0.067+ per image on Kunavo — the figure moves with output resolution, which is why it is quoted with a plus rather than as one number. There is no subscription, no monthly minimum, and a request that fails is not billed.
Most pages ranking for this question are affiliate microsites selling access to a plan. This one gives the per-image rate, what changes it, and where the cheaper tiers are the better answer.
The rates
| Model | Kunavo | Unit | Use it for |
|---|---|---|---|
| Nano Banana Pro | $0.067+ | per image | Final renders, fine detail, text inside the image |
| Nano Banana 2 | $0.0469+ | per image | The general-purpose default |
| Nano Banana 2 Lite | $0.0255 | per image | Drafts, thumbnails, anything you will regenerate |
| Nano Banana Edit | $0.0273 | per image | Image-to-image edits on a source you supply |
Every figure above is read from the model catalog when this page renders, the same source the pricing table and the model pages read. Prices quoted with a plus vary by output resolution: 4K costs more to generate than 1K or 2K.
What actually moves the bill
Resolution. This is the largest single lever and the one most often left on a default. If your pipeline resizes the output anyway — thumbnails, web images, anything inside a layout — generating at 4K is paying for pixels you are about to discard.
The tier you draft on. Image work is iterative: the image you ship is rarely the first one. Drafting on a cheaper tier and moving to Pro for the final render is a materially different bill from running every attempt at the top tier, and the difference is visible in the table above.
Retries. Image generation fails more often than a chat completion — a rejected prompt, a timeout, an upstream hiccup. Failed requests are not billed here, but a request that succeeded and produced something you did not want is. Prompt iteration is the real cost of image work, and it is why the cheap tier matters more than the headline rate.
Calling it
Nano Banana Pro is a model id on the images endpoint — one key, one base URL, the same request shape as the other image models. The runnable request, the parameters and the async polling pattern are on the Nano Banana API guide, and the endpoint reference is at the images docs. If you are pricing a mixed workload with text models in it, note that the two bill in different units: images per output, text per million tokens — the token cost calculator covers the text side only, on purpose.
FAQ
How much does Nano Banana Pro cost per image?
On Kunavo, Nano Banana Pro starts at $0.067+ per image, with the exact figure depending on the output resolution you request — a 4K render costs more than a 1K or 2K one. Billing is per generated image rather than per token, and a request that fails produces no charge. The rate is read from the catalog, so the number on this page is the number the API charges.
What is the difference between Nano Banana Pro and Nano Banana?
Pro is the higher-quality tier and is priced accordingly: Nano Banana Pro starts at $0.067+ against $0.0469+ for Nano Banana 2 and $0.0255 for Nano Banana 2 Lite. They share one endpoint and one key, so the difference is a model id in the request rather than a different integration. For drafts, thumbnails and anything you will regenerate several times, the cheaper tiers are the sane default; Pro earns its price on final renders and on prompts with fine detail or text in the image.
Is there a free way to use Nano Banana Pro?
Google's own surfaces have offered limited free access to the underlying model at various times, and the affiliate sites that rank for this query mostly monetise that fact rather than serving the model themselves. For programmatic use there is no free tier that survives volume: every generated image is a billed unit somewhere. The honest comparison is not free-versus-paid but per-image cost against the number of images you actually need, including the ones you throw away.
How is image generation billed — per image or per token?
Per image. Text models bill per million input and output tokens; image models bill per generated output, so the units do not compare and a token calculator cannot price them. Nano Banana Pro is $0.067+ per image. What does carry over from text billing is that failed requests are not charged, which matters more here because image generation fails more often than a chat completion does.
Does resolution change what Nano Banana Pro costs?
Yes, and it is the main variable. The catalog prices 1K and 2K output at one rate and 4K at a higher one, which is why the price is quoted with a plus rather than as a single figure. If you are generating at 4K by default without needing it, that is the cheapest thing to change — larger output costs more to generate and more to store, and most downstream uses resize anyway.
Can I edit an existing image with Nano Banana?
Yes — image-to-image editing is a separate model id on the same endpoint. Nano Banana Edit is $0.0273 per image, so an edit pass is priced like a generation rather than as a discount on one. Send the source image with the prompt; the request shape is documented on the images endpoint page.