GPT Image 2.5 vs Nano Banana 2: which image API to use

GPT Image and Google’s Nano Banana family are the two image APIs most teams start with. Both handle text-to-image and editing well; the differences show up in typography, multi-image consistency and cost at high resolution.

New−12%

GPT Image 2.5 Sunburstgpt-image-2.5-sunburst

ImageOpenAIText & image to image

$4.40 in · $26.40 outTry it

−95%

GPT Image 2gpt-image-2

ImageOpenAIText & image to imageUp to 4K

from $0.011/ imageTry it

Nano Banana 2gemini-3.1-flash-image-preview

ImageGoogleText & image to imageUp to 4K

from $0.019/ imageTry it

Nano Banana Progemini-3-pro-image-preview

ImageGoogleText & image to imageUp to 4K

from $0.05/ imageTry it

Choose GPT Image when

• The image contains text that must be exactly right: posters, menus, UI mockups, infographics.
• You describe layouts precisely and want them followed.
• You need many low-cost drafts at 1K with GPT Image 2.

Choose Nano Banana when

• You edit conversationally: "make it winter", "swap the outfit".
• You need the same character across many images from several references.
• You want up to 4K output for final assets.

Price

GPT Image 2 starts at from $0.011/ image and Nano Banana 2 at from $0.019/ image. Both run through POST /v1/images/generations, so you can A/B the same prompt on both and keep the winner.