Nano Banana - ZeroGen Docs

Nano Banana, from Google, makes and edits images, renders text well, and can combine up to 14 reference images. Choose a model by quality and cost:

Model	Best for	Resolutions
Nano Banana Pro	The highest quality	1K, 2K, 4K
Nano Banana 2.1	Better quality, prompt following and text than Nano Banana 2	1K, 2K, 4K
Nano Banana 2	The smallest size, 0.5K	0.5K, 1K, 2K, 4K
Nano Banana 2 Lite	The lowest cost	1K only

What you can give it

A prompt of up to 50,000 characters in Generate, or 20,000 through the API.
References: up to 14 images. With references, Nano Banana edits or combines them.

Output settings

Setting	Options
Aspect ratio	Auto, 1:1, 3:2, 2:3, 4:3, 4:5, 3:4, 16:9, 9:16, 21:9 or 4:1. Nano Banana Pro has no 4:5 or 4:1.
Resolution	See the table above. You can pick one while the aspect ratio is Auto.
Thinking	Nano Banana 2, 2.1 and 2 Lite: how much the model plans before drawing, which can help complex compositions and text. Off, the default, Minimal or High; Nano Banana 2.1 adds Medium. Higher levels cost more.
Web search	Nano Banana 2, 2.1 and Pro: Off, the default, or On to let the model look things up.
Quantity	1 to 4 images.

Cost

Each model is priced per image, by resolution:

Model	Cost per image
Nano Banana Pro	About $0.20, or $0.39 at 4K
Nano Banana 2.1	From about $0.06 at 1K to $0.18 at 4K
Nano Banana 2	From about $0.08 at 0.5K to $0.21 at 4K
Nano Banana 2 Lite	About $0.06

Web search adds about $0.02 for each image on Nano Banana 2, and about $0.02 a run on Nano Banana Pro. It’s free on Nano Banana 2.1. On Nano Banana 2.1, longer prompts and more references add slightly to the cost. Prices are as of October 28, 2026.