ByteDance Seedance 2.5 video model
Confirmed
The takeaway
On July 31, 2026 ByteDance Seed released Seedance 2.5, a joint audio-video generation model that makes a 30-second clip with synced sound in one pass (up from 15 s) and takes up to 30 images, 10 video clips and 10 audio clips as references.
Status
- Claim
Confirmed
- Our reporting
- High confidence
- Importance
- 3 of 5
- Last verified
- 25 October 2026
Your AI and this story
- GPT-6 Astra92 days after its cutoff
- Claude Opus 5.531 days after its cutoff
- Gemini 4 Argon122 days after its cutoff
- Grok 4.761 days after its cutoff
None of these four assistants can know about it. The closest, Claude Opus 5.5, stops 31 days before it.
Key facts
- Announced July 31, 2026 by ByteDance Seed; rolled out in Jimeng AI and Doubao Pro, with API access via BytePlus ModelArk ‘coming soon’ at launch (ModelArk id dreamina-seedance-2-5-260628, see the model file)
- Up to 30 s per generation in one take (previously 15 s), extendable over several rounds while keeping characters, setting and narrative consistent
- Unified audio-video joint generation: sound and picture made together and kept in sync
- References in a single pass: up to 30 images, 10 video clips and 10 audio clips; also clay-render, motion and creative references
- Editing: timestamp-level targeted audio/video edits, green screen, camera-perspective and reference-based editing
- Seedance 2.5 4K (Oct 23, 2026, Volcano Engine): 4K output with 10-bit colour, further training for facial expressions and fine motion, a 480p draft mode for cheap storyboard previews; trials for selected enterprise customers only, some Chinese and overseas film and post-production firms testing (TechNode citing IT Home); no price given
- Artificial Analysis text-to-video leaderboard (read 2026-10-25): #5, Elo 1158
- Widely used in the AI-made videos in this dataset (e.g. the Claude Pop genre)
What happened
ByteDance’s Seed team released Seedance 2.5 on July 31, 2026. It doubles the single-pass length to 30 seconds and generates sound and picture together, so dialogue and effects stay in sync. A single prompt can carry up to 50 reference files (images, clips and audio), and edits can target a time range in the clip. It launched in ByteDance’s consumer apps (Jimeng, Doubao) with the API following on BytePlus ModelArk.
On Oct 23, 2026 ByteDance’s cloud arm Volcano Engine opened a 4K version for film and television work, with 10-bit colour and a low-cost 480p draft mode for testing shots. Only selected enterprise customers can try it so far.
Why it matters
Seedance 2.5 is one of the two or three video models most creators used in the second half of 2026, and the 4K version marks a push from social clips toward professional production. Third-party pages had claimed native 4K for the July model, but BytePlus pricing listed 4K as unsupported; the October version is the first official 4K release.
Sources
3 sources from 2 sites. Numbers match the chips in the text.
3 sources: 1 primary, 2 press
Primary
- ByteDance Seed: Introducing Seedance 2.5 (July 31)seed.bytedance.com, official
Press
Changes
- Filed with the Oct 23 4K version