tl;dr: ByteDance released Seedance 2.5, a video generation model that produces 30-second audio-video clips in a single pass (up from 15s) with multi-round extensions for multi-minute output. It supports multimodal reference inputs (up to 30 images, 10 videos, 10 audio clips) and adds timestamp-level editing, green screen replacement, and clay-render-based control for composition and lighting. Available now on Jimeng AI and Doubao Pro, with API access coming via BytePlus ModelArk.