25-second Seedance 2.5 ad on a $10 budget: takes per resolution

A 25-second Seedance 2.5 clip costs about $6.72 at 480p, $14.45 at 720p and $35.54 at 1080p on Sume. A $10 budget therefore buys one 480p take and nothing at 720p or 1080p. If you need retries, the budget has to be planned around the cheapest tier first.

The arithmetic

Seedance 2.5 accepts 4 to 30 seconds per clip, and Sume's per-second price is linear inside that range, so a 25-second clip is 25 times the per-second rate. The rates below are Sume's list prices with the 1.25 house margin already applied, from the public catalog (read 2026-10-09).

What this means for a retry plan

Most ad work needs more than one take. The honest planning unit is cost per take, not cost per clip. At 480p a $10 wallet covers one take and leaves $3.283075, which is not enough for a second (a second take needs $6.716925).

A cheaper route is to test the prompt at a shorter length. Because the price is linear, a 4-second draft at 480p costs 4 x 0.268677 = $1.074708, about 16 percent of the full 25-second price. You can run five such drafts ($5.37354) and still hold $4.62646 back. Whether a 4-second draft predicts how a 25-second clip behaves depends on the shot, so treat it as a check on the prompt and the look, not on motion over a long duration.

• Minimum billed length is 4 seconds, so anything shorter is billed as 4.
• Prices are for default options with no extras.
• Pick the resolution after the prompt works, not before.

Splitting the 25 seconds instead

Another way to spend $10 is to make the ad from shorter shots. Seedance 2.5 bills a minimum of 4 seconds and allows up to 30, and the price is linear, so five 5-second shots cost the same as one 25-second clip at the same tier: 5 x 5 x $0.268677 = $6.716925 at 480p. What changes is risk. If one shot fails you re-roll 5 seconds ($1.343385) rather than 25.

The trade-off is continuity. One long take keeps a single camera move and a single subject; five shots must be matched by the prompt and joined on a timeline, which is a separate render priced at $0.10 per output minute, rounded up. For a 25-second ad that join is $0.10. If the idea needs one continuous move, pay for the single clip. If it is a montage, shots are cheaper to fix.

Reserve at submit, then capture

Sume reserves the estimated amount when it accepts a paid generation job and captures it on success. A 1080p 25-second job therefore needs $35.53875 of spendable balance at submit time, or the request is refused with 402 insufficient_credits before any provider work starts. See the generation admission docs for the exact rules and the video generation docs for the model list.

To check the live rate before you spend, call the public catalog, which needs no API key, or GET /v1/videos/models with your key.