Price per kept AI clip when 1 in 3 is rejected: Wan 720p

The price of an AI clip is the sticker price divided by your keep rate. A 15-second Wan 3.0 clip at 720p is $1.875 on Sume. If you keep one clip in three, each kept clip really costs $5.625. Put the keep rate in the budget before you add anything else.

Alibaba Cloud lists Wan 3.0 at $0.10 per second at 720p (read 2026-10-07). Sume bills list times 1.25, which is $0.125 per second, so 15 seconds is $1.875.

The keep-rate table

Divide the clip price by the share you keep. The last column is what 10 kept clips cost, minus the cost if every clip were a keeper.

Why this matters more than the rate

A 25 percent drop in the per-second price is worth less than a 25 percent rise in the keep rate. Going from one in three to one in two lowers the price per kept clip from $5.625 to $3.75. A 20 percent cheaper rate on the same one in three keep rate only gets you $4.50.

Keep rate improves with the prompt, not the model. Short drafts help: a rejected 5-second draft costs $0.625 at 720p, or $0.3125 at 480p, where a rejected 15-second final costs $1.875.

• Track kept clips against submitted clips per batch.
• Refunded jobs are not rejects: a failed job returns its hold, a rejected finished clip does not.
• Use the usage ledger to count captured rows, not just submits.

A batch example

You need 20 kept 15-second ads. At a keep rate of one in two you submit 40 clips, which is $75.00. At one in three you submit 60 clips, which is $112.50. The difference, $37.50, is the price of the lower keep rate on this batch.

A staged approach changes the sum. Draft 60 ideas as 5-second clips at 480p, at $18.75, keep 20, and render those 20 as 15-second clips at 720p for $37.50. The total is $56.25, well under the $112.50 of submitting all 60 as finals.

The drafts only help if a draft predicts the final. Motion and framing carry over from a 480p draft to a 720p clip with the same prompt, but a re-render is a new generation and can differ, so leave room for a few extra finals.

Setting a keep-rate target

Decide your target before the batch. If the budget allows $75.00 for 20 kept ads at 15 seconds, the keep rate you need is one in two. If your recent batches kept one in three, either cut the clip length, draft at 480p, or raise the budget to $112.50. Writing the keep rate next to the budget turns a surprise overspend into a planned figure.

Failed jobs versus rejected clips

The two are different on the bill. A failed job is refunded; a clip that finishes and that you do not like is captured. Only the second belongs in the keep rate. Read GET /v1/usage and count captured rows for the figure. See do failed jobs cost money for the refund path.