Comment by minimaxir

All generations in the post are $0.04/image (Nano Banana doesn't have a way to increase the resolution, yet), so you can do the math and assume that you can generated about 24 images per dollar: unlike other models, Nano Banana does charge for input tokens but it's neligible.

Discounting the testing around the character JSON which became extremely expensive due to extreme iteration/my own stupidity, I'd wager it took about $5 total including iteration.