Skip to main content
Vendor: ByteDance Model ID: seedance-fast Capability: 720p · up to 5s · text + image init · CJK prompts · async via tasks API Pricing: per second, fast tier (live rate) Seedance Fast is the speed floor of the ByteDance video family. Same character-motion strengths as 2.0 capped at 720p / 5s, with typical turnaround under 30 seconds. Use it for prompt iteration, draft passes, and UX where the user clicks “generate” and watches the clock.

​
Submit

curl https://llm.bytespike.ai/v1/tasks/submit \
  -H "x-api-key: $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "seedance-fast",
    "prompt": "一只猫从沙发上跳下来，慢动作",
    "duration_seconds": 4,
    "resolution": "720p"
  }'

​
Body parameters

Same shape as Seedance 2.0. Max duration_seconds is 5; only 720p resolution supported.

​
Submit + poll

{"task_id": "task_…", "status": "queued", "estimated_credits": 0.12}
Recommended cadence: 1s for first 30s, then 2s up to 60s.

​
Code examples

curl https://llm.bytespike.ai/v1/tasks/submit \
  -H "x-api-key: $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{"model": "seedance-fast", "prompt": "猫从沙发上跳下来", "duration_seconds": 4, "resolution": "720p"}'

​
Errors

Standard.

​
When to use

  • Latency-sensitive UX where the user is watching the clock.
  • Prompt iteration before committing to Seedance 2.0 / 2.0 Pro.
  • For 1080p output, see Seedance 2.0.
  • For Google fast variant, see Veo 3.1 Fast.

​
Limits

LimitValue
Max duration5s
Resolutions720p only
Aspect ratios16:9, 9:16, 1:1
Supports image initYes
Typical latency for 4s clip15-25s
Async via tasks APIYes