Seedance 2.5 vs Gemini Omni: length, references and editing
Seedance 2.5 and Gemini Omni Flash compared on published specs: 30 vs 10 seconds, reference rules, extension and edit mode. Ids on Sume and on Google's page.
Seedance 2.5 generates 4 to 30 seconds per request on Sume; Gemini Omni Flash 1.1 generates 3 to 10 seconds, and adds video editing and extension. Google's Gemini API names the model gemini-omni-1.1-flash, while Sume's catalog id is gemini-omni-flash-1.1.
Numbers below come from Google's Gemini Omni page, ByteDance's launch post and Sume's video docs. This is a spec comparison, not a ranking.
How do the specs compare?
The table mixes vendor pages with Sume's catalog, noted per row.
| Spec | Seedance 2.5 | Gemini Omni Flash 1.1 |
|---|---|---|
| Length per request | 4 to 30 s (Sume) | 3 to 10 s (Sume, Google) |
| Resolutions | 480p, 720p, 1080p (Sume) | 360p, 720p, 1080p, 4K (Sume, Google) |
| Aspect ratios | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 (Sume) | 16:9, 9:16 (Sume, Google) |
| Reference types on Sume | image, video, audio | image, video (no audio) |
| Video references | Vendor: up to 10 clips | Google: up to 3 clips of 3 s or less |
| Extension | Vendor task, 30 s | Appends up to 40 s total (Google) |
Which one edits an existing video?
On Sume, gemini-omni-flash-1.1 exposes an edit mode through the Video Router video_url field. seedance-2.5 has no documented edit mode on Sume; see Seedance 2.5 video editing.
What limits does Google state for references?
Google says reference videos are capped at 3 clips of 3 seconds or less, audio in a reference is ignored, and referencing or reasoning across multiple videos is not supported.
How do I choose?
Choose on the constraint. Clips over 10 seconds, or audio references: Seedance 2.5. In-place edit or extension by prompt: Gemini Omni Flash 1.1. Compare against the earlier model in Seedance 2.0 vs Gemini Omni Flash.
Sources
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