What is the Seedance Fast AI video model and when should I use it?

Seedance Fast is the model to reach for when you need to see a shot working before you invest in a final render. It prioritizes speed, so you can generate several takes of the same moment and pick a direction without waiting on each one.

That makes it the right tool for blocking a scene, testing camera motion, and checking whether a composition reads, rather than for the polished hero shot you will ultimately deliver.

Once a shot is settled, the last frame you want is chosen, the motion is right, the framing holds, that is the moment to switch to a higher-fidelity model for the finishing pass. You spend the expensive render on a version you have already approved rather than on an experiment.

FXI Studio keeps that choice explicit: the default leans fast and affordable, and you confirm before a premium model runs, so a costly generation is never a surprise.