ByteDance’s video model for 30-second storytelling with sound — and you don’t need a ByteDance account to use it here.
Seedance is the AI video model family from ByteDance’s Seed team. Seedance 2.5 was previewed at the Volcano Engine FORCE conference on June 23, 2026 and launched on July 31, 2026. ByteDance describes it as “a next-generation audio-video joint generation model, built for 30-second storytelling with precise reference control and powerful editing capabilities.”
Compared with Seedance 2.0, version 2.5 doubles the length of a single generation from 15 to 30 seconds, follows reference footage more precisely and, in ByteDance’s words, makes motion “smoother and more consistent” with more realistic visuals. Because picture and sound are generated together, footsteps, rain, voices and music land on the right frame instead of being added afterwards.
Seedance25Video is an independent web app that runs Seedance 2.5 through an API provider. You get three tiers in one Seedance 2.5 video generator — the full model, Turbo and Flash — with text-to-video, image-to-video, clips from 5 to 30 seconds and output up to 1080p.