Kling 4.0 lists four ratios; Seedance 2.5 on Sume takes six
fal's Kling 4.0 page lists 21:9, 16:9, 1:1, 9:16 and auto. Seedance 2.5 on Sume accepts six ratios, including 4:3 and 3:4. What that means for placements.
Kling 4.0 added a 21:9 ultrawide ratio in its preview. If your ad set also needs 4:3 or 3:4, check whether the model you plan around lists them. This compares what the vendor-facing page says with what you can call on Sume today.
What each page lists
fal's Kling 4.0 explainer lists 21:9, 16:9, 1:1 and 9:16, plus auto modes (read 2026-10-05). The same page says full release is in October 2026, with Kling 4.0 Flash in limited early access since September 28, and endpoint names and pricing to be posted at launch. Sume's Seedance 2.5 row accepts 21:9, 16:9, 4:3, 1:1, 3:4 and 9:16.
| Ratio | Kling 4.0 (fal page) | Seedance 2.5 (Sume) | Omni Flash 1.1 (Sume) |
|---|---|---|---|
| 21:9 | listed | yes | no |
| 16:9 | listed | yes | yes |
| 9:16 | listed | yes | yes |
| 1:1 | listed | yes | no |
| 4:3 and 3:4 | not listed | yes | no |
What Sume has today
Kling 4.0 is not a Sume catalog id as of this read; the kling-3 row is. Nothing here tells you Kling 4.0 will not accept 4:3, only that the page you would plan from does not list it. When it lands, read supported_aspect_ratios from GET /v1/videos/models before you promise a placement.
Placement plan
- Cinema-style banners: Seedance 2.5 at 21:9 today, $5.81 for 10 s at 720p.
- Feed square and vertical: Seedance 2.5 at 1:1 and 9:16, same $5.78.
- Anything needing 4:3 or 3:4 (older ad slots): Seedance rows, not the ratios listed for Kling 4.0.
Sources
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