Seedance 1.5 Pro - ByteSpike

Vendor: ByteDance Model ID: seedance-1.5-pro Capability: 1080p · up to 6s · text + image init · CJK prompts · async via tasks API Pricing: per second, mid tier (live rate) Seedance 1.5 Pro was the prior flagship of the ByteDance video family. Earned a reputation for character motion (faces, hand gestures, walking gait) at a price tier where Sora 2 felt overkill. Native CJK prompt understanding, recognizably ByteDance aesthetic. For new work, prefer Seedance 2.0 Pro; 1.5 Pro is kept for teams who’ve validated against this version.

Submit

curl https://llm.bytespike.ai/v1/tasks/submit \
  -H "x-api-key: $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "seedance-1.5-pro",
    "prompt": "一个女孩在樱花树下转身微笑，柔和的春日阳光",
    "duration_seconds": 5,
    "resolution": "1080p"
  }'

Body parameters

Field	Type	Required	Default	Notes
`model`	string	yes	—	`seedance-1.5-pro`
`prompt`	string	yes	—	CJK accepted natively.
`duration_seconds`	integer	yes	—	1–6.
`resolution`	string	no	`1080p`	Supported: `720p`, `1080p`.
`aspect_ratio`	string	no	`16:9`	`16:9` / `9:16` / `1:1`.
`seed`	integer	no	—	Reproducibility.
`image_init`	string	no	—	URL of init image.
`motion_intensity`	string	no	`medium`	`low` / `medium` / `high`.

Submit + poll

Standard tasks shape — see tasks/submit for envelope.

{"task_id": "task_…", "status": "queued", "estimated_credits": 0.42}

Recommended cadence: 2s for first 60s, then 5s up to 180s.

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-1.5-pro", "prompt": "樱花树下女孩微笑", "duration_seconds": 5, "resolution": "1080p"}'

Errors

Code	Trigger	Billed?
400 / 401 / 402 / 403	Standard	No
451	Prompt blocked by upstream safety	No
5xx	Upstream issue	No (auto-retry)

When to use

Existing pipelines validated against this version.
For new work, prefer Seedance 2.0 Pro.
For lower cost / latency, see Seedance 2.0.

Limits

Limit	Value
Max duration	6s
Resolutions	720p, 1080p
Aspect ratios	16:9, 9:16, 1:1
Supports image init	Yes
Typical latency for 5s clip	60-90s
Async via tasks API	Yes

Veo 3.1 Fast Seedance 2.0

​Submit

​Body parameters

​Submit + poll

​Code examples

​Errors

​When to use

​Limits