Comment by gpt5
5 hours ago
Nano Banana 2 only supports 1K resolution (1024x1024) natively. Anything above that is upscaling. So this matches SDXL. GPT Image 2 does support 4k natively (but experimentally).
5 hours ago
Nano Banana 2 only supports 1K resolution (1024x1024) natively. Anything above that is upscaling. So this matches SDXL. GPT Image 2 does support 4k natively (but experimentally).
Where did you get that info from? According to Google's own docs as well as my own image generation tests via the API, it supports up to 4K natively for gemini-3.1-flash-image-preview (aka NB2).
It just defaults to 1K. But I didn't see anything in the docs stating that it's just a simple upscale for larger resolutions.
https://ai.google.dev/gemini-api/docs/image-generation#gener...
From: https://aistudio.google.com/models/gemini-3-pro-image
> Produce production-ready assets with native 1K output and built-in upscaling to 2K and 4K resolutions
The API doc you linked is misleading.
Yeah - if that's true then it's even worse because the output price says
But if all the "compute time" is spent on a 1K image and they're just passing it to a ESRGAN or other upscaling technique, then there’s literally zero reason to generate anything above 1K. Just save the money and upscale it yourself.
It's not upscaling for NB2, 4K outputs are very different from 1K, and output tokens count is also different.