Omni 9:16 and 16:9 cost the same: aspect ratio is not a price lever

A 9:16 clip and a 16:9 clip of the same length and resolution cost the same on Gemini Omni Flash 1.1 on Sume. The catalog prices the model per second by resolution, and the only two aspect ratios it takes are 16:9 and 9:16. So a pair of ratio variants costs exactly double one clip.

Same price, both ratios

Eight seconds at each tier, for either ratio.

Sume rounds each clip up to the next whole cent, so a clip total is ceil(seconds x rate), not a sum of fractional cents.

What this means for a campaign

If you need a feed version and a story version of the same idea, there is no price reason to prefer one ratio over the other. The two clips are separate generations, so the vertical is not a crop of the landscape. Expect different framing, and write each prompt for its shape.

Doing both at 720p for 8 s is $2.00 per idea. For ten ideas that is $20.00, against $10.00 for one ratio. If one ratio is good enough, you save half.

What Omni will not do

Ratios other than 16:9 and 9:16 are not accepted, for example 1:1 or 4:3. In edit mode the ratio is not a field at all: the docs say there is no aspect_ratio or duration in an edit. For a ratio Omni does not offer, choose a model whose catalog row lists it, or crop in a later step.

Check supported_aspect_ratios in the video models response before you build a ratio picker.

The same length at every tier

For reference, a 6-second Omni Flash clip at each resolution. Every price is the seconds times the billable rate, rounded up to a whole cent, as of 2026-10-08.

Limits to remember

These apply to every request on this page, from the Video Router and Video generation docs:

• Length is 3 to 10 whole seconds in generation modes; an edit takes no duration.
• Aspect ratio is 16:9 or 9:16; an edit takes no aspect ratio.
• Native synced audio is always on, and generate_audio: false is rejected.
• There is no bitrate_mode, no reference audio and no seed.
• Billing is the provider list times 1.25 per output second, reserved at submit and shown in usage.cost.