AI video defaults on Sume: 768p, 480p, 720p and 8 seconds explained

When you leave resolution or duration off a Sume video request, the row fills in a default. Most are sensible, but a few differ from what you might assume from the vendor's own page, and a default that picks a higher tier costs more. The catalog documents four that matter.

Which defaults does Sume set?

The values come from the Sume Video Router constraints, not from this post, so read the live catalog if you are unsure.

Why does the Recast default matter?

Recast at 768p is $0.375 per second billable; at 1080p it is $0.5625, a 50 percent step. A script ported from fal's docs, which default to 1080p, would expect the higher tier. On Sume you get 768p unless you ask for 1080p, so a first run costs less and looks softer. Send resolution: "1080p" explicitly when you need it.

What should I do about defaults?

Do not rely on them in code that has a budget. Send resolution and duration on every request so the cost is visible in your own request log, and so a catalog change cannot move your bill. For Genjutsu, defaulting to 480p keeps trial runs cheap at $0.3975 per second, but the 720p tier is $0.85125 per second, so a quality check there is more than double.

The same logic applies to Auto: leaving out duration gives eight seconds, which at 720p is a fixed $1.00 per clip at Gemini Omni Flash 1.1's rate.