The pricing changes are interesting. I wonder if at some point they will deprecate the less expensive model to increase their margins.

Original Nano Banana (gemini-2.5-flash-image): $0.039 per image (up to 1024×1024px)

Nano Banana 2 (gemini-3.1-flash-image-preview): $0.045 per 512px image $0.067 per 1K (1024×1024) image $0.101 per 2K image $0.151 per 4K image

Nano Banana Pro (gemini-3-pro-image-preview): $0.134 per 1K/2K image $0.240 per 4K image

So at the most common 1K resolution, NB2 is ~72% more expensive than the original NB ($0.067 vs $0.039), but still half the price of NB Pro ($0.134).