ByteDance launches Seedance 2.5 with 30-second AI video generation in one pass

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ByteDance officially released Seedance 2.5 on July 31, 2026, a new AI video generation model developed by its Seed team. The model doubles the maximum clip length from 15 to 30 seconds with synchronized audio produced in a single generation step. It supports multi-round clip extension to create multi-minute sequences while maintaining consistent characters, settings, and visual style. Users can supply up to 30 images, 10 video clips, and 10 audio clips as reference material in a single generation, alongside new editing tools such as timestamp-level control, green screen, and camera perspective changes. Seedance 2.5 is already available through ByteDance's Jimeng AI and Doubao Pro platforms, with API access via BytePlus ModelArk expected soon.

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