Yeah - if that's true then it's even worse because the output price says
$0.067 per 1K image*, $0.101 per 2K image*, and $0.151 per 4K image*.
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.
> Produce production-ready assets with native 1K output and built-in upscaling to 2K and 4K resolutions
The API doc you linked is misleading.