100 15-second clips: $21 at Vidu Q4's from-rate, $94 to $210 on Sume
100 clips of 15 s is 1,500 s: $21.00 at Vidu's $0.014/s launch rate. On Sume the cheapest listed models cost $94.00, $188.00 and $210.00 at 480p, 720p, 1080p.
The short answer
One hundred 15-second clips is 1,500 seconds of video. At Vidu Q4 Preview's "starting at $0.014/sec" launch rate that is 1,500 x $0.014 = $21.00. On Sume, with the cheapest listed model at each resolution, the same batch costs $94.00 at 480p, $188.00 at 720p and $210.00 at 1080p. Sume does not list Vidu Q4 Preview, so this is a comparison of price points, not a purchase option.
Batch arithmetic
Sume bills each clip separately and rounds each clip up to a whole cent, so the batch price is 100 times the clip price, not 1,500 times a per-second price.
| Option | Per clip | x 100 clips | Model |
|---|---|---|---|
| Vidu Q4 Preview "from" rate | $0.21 | $21.00 | Q4 Preview (not on Sume) |
| Sume 480p | $0.94 | $94.00 | MiniMax H3, H3 Max or Wan 3.0 |
| Sume 720p | $1.88 | $188.00 | Wan 3.0 |
| Sume 1080p | $2.10 | $210.00 | Kling 3, no audio |
Where the rounding bites
A 15 s clip on Wan 3.0 at 480p is $0.05 x 15 = $0.75 at list, and $0.9375 after the 1.25 margin. Sume rounds that up to $0.94. Across 100 clips the rounding adds 100 x $0.0025 = $0.25. At this scale it is small; at 10,000 clips it is $25, which is why the clip price, not a per-second rate, is the number to multiply.
The Vidu figure is the opposite kind of number: a "from" rate that the release (read 2026-10-08) does not tie to a resolution, and which it says may vary by plan and region. Treat $21.00 as the lowest conceivable bill for 1,500 seconds, and ask Vidu for the rate at the resolution you will ship.
Why the headline rate and the invoice can differ
A per-second headline multiplies cleanly: 1,500 s x $0.014. A billed clip rarely does. Three things move a real bill. First, resolution: Sume prices the same 15 s at $0.94, $1.88 or $2.10 depending on the 480p, 720p or 1080p tier you pick. Second, features: Kling 3 with audio on is 1.5x the muted price (list $0.168 vs $0.112 per second). Third, rounding: each clip is rounded up to a whole cent.
When you compare any vendor headline with a billable table, compare like with like: same duration, same resolution, audio on or off, and whether the quoted rate is the lowest tier of a ladder. Where the vendor does not state those, as with the Q4 Preview launch rate, the headline is a lower bound only.
Budgeting a batch of this size
If you plan 100 clips, keep a retry margin; many teams discard some takes. Ten percent extra on the 480p row is 10 x $0.94 = $9.40. For the draft-then-final workflow, run the batch at 480p, pick winners, then re-run only those at 1080p. The model catalog and limits are in Video generation.
Sources
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Written by Sume