Seedance 2.5 on Runway at 20 to 68 credits a second vs Sume tokens

Runway's pricing page lists seedance2_5 at 20 to 68 credits per second plus input fees. At $0.01 a credit that is $0.20 to $0.68 a second. Sume bills seedance-2.5 per 1,000 video tokens, so a clip's price depends on tokens, not seconds alone. The fastest way to know a Sume price is to run one test and read usage.cost.

Runway's Seedance family

All rows below come from the same Runway pricing page; dollars assume $0.01 per credit.

How Sume bills the same family

Sume lists seedance-2.5, seedance-2, seedance-2-fast and seedance-2-mini. Seedance 2.5 runs 4 to 30 seconds at 480p, 720p and 1080p; the other three run 4 to 15 seconds. Prices are per 1,000 video tokens at vendor list times 1.25, and they appear as pricing_skus in GET /v1/videos/models. The poll response includes usage.cost for the finished job.

A fair test

Run one clip of the length and resolution you intend to ship on both routes, then compare the finished cost. Runway's number includes input fees for images, video and audio that you attach, so a reference-heavy shot can sit well above the headline rate on either side.

Reading the spread

The 20 to 68 credit spread means the rate rises with resolution, and Runway adds input fees on top. If you plan an image-heavy or audio-referenced shot, price the inputs as well as the seconds. Sume bills per token instead of per second, so the poll response's usage.cost is the authoritative number for a finished job.