Runway Seedance 2 Fast at 29 credits a second vs Sume token math
Runway charges 29 credits ($0.29) per second for Seedance 2 Fast. Sume bills tokens: 10 s at 720p 16:9 is 216,000 tokens, about $3.02 vs $2.90.
Runway lists Seedance 2 Fast at 29 credits per second, which is $0.29 at $0.01 per credit. The guide gives one credit value for the model, not a table by resolution. Sume prices seedance-2-fast by video tokens. For a 10 second 720p 16:9 clip, that is 216,000 tokens, which is about $3.02 on Sume against $2.90 on Runway. At 480p the Sume price is lower.
The token formula
Sume's pricing code counts video tokens as (width x height x seconds x 24 fps) / 1024. The rate card for seedance-2-fast lists $0.0112 per 1,000 video tokens, and Sume bills list x 1.25, which is $0.014 per 1,000 tokens. The 720p 16:9 frame is 1280 x 720, and the 480p 16:9 frame is 864 x 496.
| Clip | Tokens | List at $0.0112 / 1,000 | Sume at list x 1.25 | Runway at $0.29/s |
|---|---|---|---|---|
| 480p, 4 s | 40,176 | $0.4500 | $0.5625 | $1.16 |
| 480p, 10 s | 100,440 | $1.1249 | $1.4062 | $2.90 |
| 720p, 4 s | 86,400 | $0.9677 | $1.2096 | $1.16 |
| 720p, 10 s | 216,000 | $2.4192 | $3.0240 | $2.90 |
| 720p, 15 s | 324,000 | $3.6288 | $4.5360 | $4.35 |
Worked example
Worked example for the 720p, 10 s row: 1280 x 720 = 921,600 pixels. 921,600 x 10 x 24 = 221,184,000. Divided by 1024 gives 216,000 tokens. At $0.0112 per 1,000 tokens that is 216 x $0.0112 = $2.4192, and times 1.25 is $3.024.
Which is cheaper
Treating Runway's $0.29 per second as flat, Sume costs less at 480p at every length in the table. At 720p it costs more than Runway at all three lengths, by about 4% ($1.2096 against $1.16, $3.024 against $2.90, $4.536 against $4.35). Sume lists seedance-2-fast at 480p and 720p only, for 4 to 15 seconds.
Runway's web plans use different units: Seedance 2.0 Fast is 116 credits per 4 seconds there, which is also 29 credits per second. The live Sume rate is pricing_skus on GET /v1/videos/models; check it before you plan spend, because the rate card can change.
Sources
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Written by Sume