ByteDance Seed launches Seedance 2.5: 30s single-pass audio-video generation with multi-round extensions

Seedance 2.5

Seedance 2.5 extends single-pass generation from 15 to 30 seconds and supports multi-round extensions to produce coherent multi-minute videos. It organizes shots into a narrative arc rather than stretching a single moment. Multimodal referencing now accepts up to 30 images, 10 video clips, and 10 audio clips in one pass. Editing gets timestamp-level control, plus stronger green screen, camera perspective, and reference-based editing. Available now on Jimeng AI and Doubao Pro; API access is coming soon via BytePlus ModelArk. The post does not disclose parameter count, training data, or pricing.

Why it matters: ByteDance Seed team officially launches Seedance 2.5, pushing single-pass generation to 30 seconds with multi-shot narrative support and significantly expanded reference input capacity. This is a major version update for a domestic flagship video model, with concrete specs and...