ByteDance
Seedance 2.5
The long-take release — one continuous shot, with sound
Seedance 2.5 is ByteDance’s video model, available on Ochra for text-to-video and image-to-video. It generates clips with a synchronised audio track and extends the maximum clip length well past 2.0, which makes it the catalogue’s choice for a single continuous shot rather than a cut sequence.
What is different about Seedance 2.5
- Extends the maximum clip length substantially beyond 2.0, which is the whole reason to pick it: a shot that would previously have needed stitching now renders as one take.
- Drops the 4K option 2.0 offers. This is a genuine trade rather than an oversight — if you need the resolution more than the length, 2.0 is still the right row.
- Keeps the synchronised audio track, so the longer clip arrives with sound rather than needing a pass through a music or speech model.
Key Features
- The longest single take available here, which matters for anything with continuous motion — a walk, a camera push, a performance — where a cut would break the illusion.
- Audio is generated with the picture rather than bolted on, so footsteps and ambience land on the frames that caused them.
- Reads an image reference as a first frame faithfully, so a character generated elsewhere on the platform carries into the shot.
Where it falls down
- No 4K. For a delivery that has to be mastered at high resolution, use Seedance 2.0 and accept the shorter maximum.
- Long generations cost proportionally more and take proportionally longer; the price shown on this page is for the cheapest advertised configuration, not the longest.
Seedance 2.5 questions
2.5 generates much longer clips; 2.0 generates at a higher maximum resolution. Both produce synchronised audio. Pick 2.5 when the shot needs to run without a cut, and 2.0 when the frame has to hold up at 4K.
Yes. Audio is generated alongside the video as one result, so it is synchronised to the action rather than added afterwards. You do not need a separate music or speech generation to get a clip with sound.
The video-to-video sibling. It takes a clip you already have and restyles or alters it, rather than generating from a prompt or a still. It is on the video editing surface rather than the generator.