Nano Banana Pro on Sume: 2K costs the same as 1K, 4K doubles

On Sume, Nano Banana Pro is $0.1875 per image at 1K and also at 2K, then $0.375 at 4K. So if you want Pro, 2K is free upgrade over 1K, while Nano Banana 2 charges more at every step ($0.075 at 0.5K, $0.10 at 1K, $0.15 at 2K, $0.20 at 4K).

What it means for a batch

At 2K, 100 Pro images cost $18.75 and 100 Nano Banana 2 images cost $15. Pro is the pricier model at 2K, but only by 25%, while at 1K it is 87.5% above Nano Banana 2. If you need the sharper model, request 2K.

Where to confirm

The sizes, ids and prices come from the live catalog (GET /v1/catalog) and the Images docs. The same prices appear on the rate card; read them there before you budget a large batch.

Recompute it in Python

A hundred 2K images, both models. The numbers are the ones in the table above.

pro = {'1K': 0.1875, '2K': 0.1875, '4K': 0.375}
nb2 = {'0.5K': 0.075, '1K': 0.10, '2K': 0.15, '4K': 0.20}
print(100 * pro['2K'], 100 * nb2['2K'])