From the source
Black Forest Labs launched FLUX Upscale, a standalone tool and API endpoint that upscales video up to native 4K, fixing imperfections like smudged faces and gridded artifacts.
It offers two modes: Precise (4 steps, $0.07/mp/s) and Creative (8 steps, $0.10/mp/s).
Upscale factors of 1.5x, 2x, and 3x are supported.



