sedance.appOpen studio

Seedance 2.0 Fast

Draft here first. Iterate cheap, then commit to length.

What is Seedance 2.0 Fast?

Seedance 2.0 Fast generates 4–15 second video at up to 720p, with 9 image and 3 video references per request and native audio. It is available on the Starter plan and above, and through the API at /api/v1/generations. Typical wall-clock is 55s (p50) and 130s (p95).

Capabilities

CapabilityByteDance’s claimOur measurement
Duration4–15s in 1s stepsconfirmed
Resolutions480p, 720pconfirmed
Aspect ratios16:9, 9:16, 4:3, 3:4, 21:9, 1:1confirmed
Native audioYesconfirmed
Total references12confirmed
Image references9confirmed
Video references3 (≤15s each)confirmed
Audio references3confirmed
End frameYesconfirmed
Return last frameYesconfirmed
Video extensionNoconfirmed
Region-level editingNoconfirmed
R2V controlNoconfirmed
3D camera blockoutNoconfirmed
Multilingual dialogueNoconfirmed

A row reads “not verified yet” when the figure comes from ByteDance’s announcement and we have not confirmed it against the provider API ourselves. We would rather show the gap than restate a keynote.

What it costs

Credit cost at 720p, standard tier. Derived from published vendor rates pending our own benchmark run.

00:00:04:00720p16:9standard264cr≈ $2.64
00:00:10:00720p16:9standard650cr≈ $6.50
00:00:15:00720p16:9standard972cr≈ $9.72

Call it from the API

curl https://sedance.app/api/v1/generations \
  -H "Authorization: Bearer $SEDANCE_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance-2.0-fast",
    "prompt": "A slow dolly-in across a rain-soaked rooftop at dusk",
    "resolution": "720p",
    "duration_sec": 15,
    "aspect_ratio": "16:9",
    "confirm_cost": true
  }'

Returns 202 with the job id and the credits held. Poll /api/v1/generations/:id — the poll cadence for a 15s job should start at 3s.

Questions

How long can a Seedance 2.0 Fast video be?
4 to 15 seconds per request, in 1-second steps.
Does Seedance 2.0 Fast support 4K?
No. Seedance 2.0 Fast tops out at 720p. For 4K, use Seedance 2.0 4K or Seedance 2.5 on the Pro plan.
How much does a 15-second Seedance 2.0 Fast video cost?
972 credits at 720p, standard tier — about $9.72. The studio shows the exact figure before you generate and asks you to confirm anything over 800 credits.
Which plan includes Seedance 2.0 Fast?
The Starter plan and above. There is no free tier — every generation costs real GPU time, so access starts with a paid plan or a credit pack.
How many reference inputs does Seedance 2.0 Fast accept?
Up to 12 in total: 9 images, 3 videos of at most 15s each, and 3 audio clips.

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