Seedance 2.5 price by duration, 4 to 30 seconds, on Sume

On Sume, a Seedance 2.5 clip costs the same number of dollars for every second you add. A 9:16 clip at 720p is $0.5778 per second, so five seconds is $2.889 and thirty seconds is $17.334: six times the length, six times the price. There is no discount for a long clip and no penalty for a short one inside the supported 4 to 30 second range.

That makes duration the easiest lever to budget. Pick the number of seconds you will actually use, because every second you generate and cut is paid for.

What does each duration cost at each resolution?

The Video Generation docs say seedance-2.5 accepts 4 to 30 seconds at 480p, 720p and 1080p. The prices below are the customer estimates from Sume's pricing package for a 9:16 request with a prompt only, the same figures the Sume API pricing page is generated from.

How does resolution change the price?

Seedance prices come from a token formula in the pricing package: width times height times seconds times 24 frames per second, divided by 1,024, billed per thousand video tokens. More pixels means more tokens, so resolution multiplies the per-second rate while seconds multiply the whole clip.

From the table, 720p costs about 2.15 times 480p ($2.889 against $1.343 for five seconds) and 1080p costs about 2.46 times 720p ($7.108 against $2.889). The resolution comparison post goes deeper on picking between them.

Why can the same duration have a different price?

Because the formula uses pixels, the aspect ratio changes the pixel count, and so the token count. This table fixes 9:16. A 21:9 request is quoted from its own pixel count, which is why the catalog lists a maximum for Seedance 2.5 at 21:9. Send the aspect ratio you will publish before you trust a quote, or ask the models endpoint for pricing_skus as the Video Generation docs describe.

How should you use a linear price?

Because cost per second is constant, the cheapest way to get a long result is not to generate it in one piece for a discount, there is none. Choose by editing needs.

• If a shot needs 8 seconds in the final cut, request 8, not 15: the extra 7 seconds are 87% more money for footage you throw away.
• If you are unsure of the best length, draft at 480p for the same number of seconds, then regenerate the winner at the delivery resolution.
• If you need 30 seconds of continuous action, a single 30-second job costs the same as two 15-second jobs; the 30-second clip post covers when to split.
• Include a retry allowance in the plan; at 720p, one extra five-second take is $2.889.

What a budget line looks like

A campaign with twelve 8-second 720p clips costs 12 times $4.6224, or $55.47, before retries. At a 70% keeper rate you would expect about 17 takes and $79 in total; the retry-buffer post shows how to size the cushion.