Seedance 2.5 vs Kling 3.0: durations, references and audio
Seedance 2.5 and Kling 3.0 compared on the specs their own pages and Sume's catalog publish: length, resolution, references, audio. No winner, just the table.
Seedance 2.5 and Kling 3.0 differ mainly in clip length and reference handling. Seedance 2.5 takes 4 to 30 seconds per request and up to 12 references on Sume; Kling 3.0 tops out at 15 seconds in Sume's catalog and takes no input_references there.
This page compares published specs only. Kling's numbers come from its VIDEO 3.0 user guide; Seedance's from ByteDance's launch post and Sume's video docs.
How do the specs compare?
Two rows for length, because the vendor page and Sume's catalog say different things for Kling.
| Spec | Seedance 2.5 | Kling 3.0 |
|---|---|---|
| Length (Sume catalog) | 4 to 30 s | 4 to 15 s |
| Length (vendor page) | Up to 30 s | 3 to 15 s |
| Resolution (Sume catalog) | 480p, 720p, 1080p | 720p, 1080p |
| Aspect ratios (Sume catalog) | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 | 16:9, 9:16, 1:1 |
| Frame images (Sume catalog) | first and last | first and last |
| Input references (Sume catalog) | image, video, audio (max 12) | None |
| Native audio | Yes | Yes |
Why are two length rows different?
Kling's page describes a 3 to 15 second range; Sume's catalog lists 4 to 15 for kling-3. Send what the catalog lists when you call Sume.
How do I choose?
Pick by the constraint that binds. Need a clip over 15 seconds, a 21:9 frame, or audio and video references: Seedance 2.5. Need only 16:9, 9:16 or 1:1 up to 15 seconds: both work. Kling's page also describes 2 to 4 reference images for elements; that is a feature of Kling's own product, not of Sume's kling-3 request.
Can I try both from one request shape?
Yes. model is the only field that changes between them; see one API for Kling, Seedance and other video models.
Sources
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Written by Sume