Seedance 2.5 Doubles One-Pass Video to 30 Seconds

ByteDance's Seedance 2.5 doubles single-pass audio-video generation from 15 to 30 seconds, supports up to 30 image, 10 video, and 10 audio references, and adds timestamp-level editing. 1

For creators, the useful shift is workflow: plan the full story arc before generation, assign each reference a clear job, and use time-based edits to repair only the section that missed.