ByteDance Seedance 2.5 Video Extend

ByteDance Seedance 2.5 Video Extend is ByteDance's video extend model that extends an existing video with a prompt-driven cinematic continuation generated seamlessly from its last frame. Billing is based on the combined duration of the reference video and the new segment by resolution tier; the reference duration is clamped to 2-30 seconds and the new segment duration is set by the duration parameter.