Runway Seedance 2 at 36 credits a second vs Sume's Seedance rates

Runway's pricing page, read 2026-10-01, lists seedance2 at 36 credits per second at 480p and 720p, 40 at 1080p and 150 at 4K, and seedance2_fast at 29 credits per second at 480p and 720p. Credits are $0.01 each. A 5-second 720p clip is $1.80 on seedance2 and $1.45 on seedance2_fast.

On Sume, a 5-second 16:9 clip at 720p reserves $1.89 on seedance-2 and $1.52 on seedance-2-fast, at list x 1.25. Sume prices resolution separately, while Runway lists one flat rate for 480p and 720p.

How do the two compare for 5 and 10 seconds?

Runway credits at $0.01; Sume reserved amounts from its pricing code, rounded up to the cent. Runway also lists per-model minimums on its page, which are not included here.

Where does the Sume row stop?

Sume's Seedance 2.x ids top out at 1080p and 4 to 15 seconds; there is no 4K tier. They accept first and last frames and image, video and audio references. Limits are in the video docs.

How do I call the fast tier?

Set model to seedance-2-fast.

curl -X POST https://api.sume.com/v1/videos \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: fast-001" \
  -d '{
    "model": "seedance-2-fast",
    "prompt": "A skateboarder lands a kickflip, low angle, golden hour",
    "duration": 5,
    "resolution": "720p",
    "aspect_ratio": "16:9"
  }'