1:1 square AI video on Sume: eight rows take it, Omni does not

Eight video rows on Sume accept aspect_ratio: "1:1": the four Seedance rows (2.5, 2, 2-mini, 2-fast), Kling 3, Wan 3.0, MiniMax H3 and MiniMax H3 Max. Gemini Omni Flash 1.1 does not; it takes 16:9 or 9:16 only. The cheapest square clip is a 5-second 480p Wan 3.0, H3 or H3 Max job at 5 x $0.0625 = $0.3125, shown as $0.31.

Which rows list 1:1

The list below is from the Video Router capabilities. Some rows send no aspect ratio at all, because they follow the source media.

Price of a square clip

The ratio does not change the price. Sume prices video by output second and resolution, so a 1:1 clip costs the same as 16:9 at the same length and tier. At 5 seconds: Wan 3.0 or H3 at 480p is $0.3125; Seedance 2 at 480p is 5 x $0.17577 = $0.87885, shown as $0.88; Seedance 2.5 at 480p is 5 x $0.268677 = $1.343385, shown as $1.34.

• Kling 3 lists 720p and 1080p only, and 4 to 15 seconds.
• The 4:3 ratio and 21:9 are not on every row; Wan has no 21:9.
• The docs say size is rejected on every v1 model, so use resolution plus aspect_ratio.

If you only have Omni

Omni's native audio and 4K tier make it attractive, but its ratio list ends at 16:9 and 9:16. To publish a square clip from an Omni render you would crop a vertical or wide file. A 9:16 clip cropped to 1:1 keeps the full width and loses height, so frame subjects near the centre if you plan to do that. Otherwise pick one of the eight rows above and ask for 1:1 directly.

Checking the live list

Rows change as providers are added or retired, so confirm with GET /v1/videos/models and read supported_aspect_ratios for the row you plan to use. Do not rely on a copy of this table in production code.

If a row reports 1:1 and the request still fails, check that the ratio is valid together with the resolution and duration you chose. The error body names the field.