Seedance 2.5
Released Jul 31, 2026
ByteDance Seed's audio-video generation model, sold as Dreamina Seedance 2.5: up to 30-second clips, up to 50 omni-reference assets, and timestamp-based editing and extension.
- Price per second
- —
- Max clip length
- 30 s
- Max resolution
- 1080p
- Native audio
- Yes
- AA arena Elo
- 1156
- LMArena Elo
- 1474
- Capabilities
- text to video, image to video, video editing, extension
- Licence
- Proprietary
Strengths & weaknesses
Strengths
- 30-second single generation (up from 15 s in Seedance 2.0), extendable over multiple rounds
- Up to 50 reference assets (30 images, 10 videos, 10 audio clips), including audio-only references
- Video editing and forward/backward extension in the same model
- Native multilingual audio generation in 11 languages
Weaknesses
- 1080p maximum output (Seedance 2.0 offered 4K)
- Not available in the United States at launch, per Dreamina's launch post
- Activating it on BytePlus needs a USD 30+ balance, a savings plan or a resource pack
releaseDate is the Dreamina debut (Dreamina launch post dated 2026-07-31; ByteDance's PR Newswire release of 2026-08-03 says it debuted on Dreamina on July 31). Third-party sites say API access came on 2026-08-07; BytePlus's model-release page lists dreamina-seedance-2-5-260628 as a new release but I could not tie it to a date. Price is per token, not per second: BytePlus ModelArk charges USD per million tokens ($10.70 at 480p/720p without video input, $6.40 with video input; 1080p $11.7 / $7.0), so perSecondUsd is null and nothing was converted. Max output resolution per the BytePlus tutorial: 480p, 720p (default), 1080p (10-bit HEVC). The 4K that some press reports claim is not on the official docs. No Volcano Engine (China) model ID verified. No open weights.
Links
API model strings
- byteplus-modelark
dreamina-seedance-2-5-260628