# Seedance on BytePlus ModelArk (slim)

> Seedance is ByteDance's family of video generation models, sold through the BytePlus ModelArk API. An agent creates an asynchronous task from text, images, video or audio and collects an MP4 by polling or callback.

- Full: https://www.anchorterminal.com/tools/seedance-on-byteplus-modelark.md (~8,700 tokens) · this version ~2,030 tokens · JSON https://www.anchorterminal.com/tools/seedance-on-byteplus-modelark.json · canonical https://www.anchorterminal.com/tools/seedance-on-byteplus-modelark
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-10

**C · 59.3/100 · rank #553 of 950 · #8 in Video generation · not agent-ready · confidence medium**


Assessment: The video task API documents limits, error codes and per-model parameters in detail, with callbacks, a filterable task list and API keys restrictable by model and IP address. No status page, OpenAPI file or free video quota was found, the newest models need a USD 30 balance, and BytePlus model services are not sold in the United States.

## Facts

- Kind: Model API · vendor: BytePlus · category: Video generation · legal entity: BytePlus Pte. Ltd. · provenance 59/100
- Endpoint: `https://ark.ap-southeast.bytepluses.com/api/v3` (HTTP)
- Auth: API key · pricing: Pay per use · x402: no · licence: Proprietary service under the BytePlus Customer Agreement and Service Specific Terms. The Go SDK is Apache-2.0
- Probe metrics: not measured yet (probes haven't run)
- Models: `dreamina-seedance-2-5-260628`, `dreamina-seedance-2-0-260128`, `dreamina-seedance-2-0-fast-260128`, `dreamina-seedance-2-0-mini-260615`, `seedance-1-0-pro-250528`, `seedance-1-0-pro-fast-251015`. `seedance-1-5-pro-251215` stops on 11 November 2026
- Max clip length: Seedance 2.5 4 to 30 seconds. Seedance 2.0 series 4 to 15. Seedance 1.0 pro and pro fast 2 to 12
- Resolution: Seedance 2.5 480p, 720p and 1080p. Seedance 2.0 up to 4K. 2.0 fast and 2.0 mini 480p and 720p. 24 frames a second, MP4, with MOV output on 2.5
- Audio: Generated speech, sound effects and music on Seedance 2.5, 2.0 and 1.5 pro, on by default through `generate_audio`. Output audio is mono
- Inputs: Text, first and last frame images, and on 2.5 and 2.0 reference images, video and audio. 2.5 takes up to 30 images, 10 videos and 10 audio clips. 2.0 takes 9, 3 and 3. Real human faces can't be uploaded directly
- Output retention: Video URL valid 24 hours. Task records kept 7 days. A Seedance 2.5 URL can be downloaded up to 100 times
- Rate limits: Seedance 2.5 and 2.0 series 600 task creations a minute and 10 concurrent for enterprise accounts, 180 and 3 for individuals. 2.0 at 4K 15 a minute and 1 concurrent. Retrieve and delete 20 requests a second, list 1 a second. BytePlus calls these theoretical maximums
- Free tier: None listed for video models. Seedance 2.5 and 2.0 activate only with a USD 30 balance, savings plan or resource pack
- Callbacks: `callback_url` receives a POST on each status change. A failed delivery, with no confirmation in 5 seconds, is retried three times
- Task controls: `priority` 0 to 9 within an endpoint, `execution_expires_after` from 1 hour to 72 hours (default 48), draft mode at 480p on 2.5, `service_tier` flex at half price on Seedance 1.0 models only
- Regions: One data plane host, ark.ap-southeast.bytepluses.com. Data centres in Malaysia, Indonesia and the EU/EEA. Not available in the United States per the service terms
- SDKs: Python `arkruntime`, Go `github.com/volcengine/ark-runtime-go` (v0.9.0, Apache-2.0) and Java `com.volcengine:ark-runtime`. Older `byteplus-python-sdk-v2` and `byteplus-java-sdk-v2-ark-runtime` packages remain for APIs the new SDK lacks
- Certifications: The trust centre lists ISO 27001, 27017, 27018 and 27701, SOC 1, 2 and 3, CSA STAR, PCI DSS and Singapore MTCS Level 3 for BytePlus as a whole
- Prices: Dreamina Seedance 2.5 480p $0.103 per second of video; Dreamina Seedance 2.5 720p $0.231 per second of video; Dreamina Seedance 2.5 1080p $0.569 per second of video; Dreamina Seedance 2.0 720p $0.15 per second of video; Dreamina Seedance 2.0 4K $0.78 per second of video; Dreamina Seedance 2.0 fast 720p $0.12 per second of video; Dreamina Seedance 2.0 mini 720p $0.08 per second of video; Seedance 1.0 pro 1080p $0.122 per second of video; Seedance 1.0 pro fast 1080p $0.048 per second of video

- Scores: Reliability 36, Performance pending, Schema & documentation 61, Agent ergonomics 85, Security & auth 79, Payments & pricing 20, Task success pending, Maintenance & community 75, Transparency & trust 63 · total over the 7 assessed categories
- Why: Reliability, No status page was found on the site footer, the docs, the trust centre or llms.txt (0), so there is no incident record to read (0). · Schema & documentation, No OpenAPI or similar file was found. · Agent ergonomics, Create returns only a task ID, the task object is small, and `callback_url` posts each status change so an agent need not poll (25). · Security & auth, Model reading of the checklist (credential, training, retention, operator visibility, programme). · Payments & pricing, No x402, MPP or L402 found (0). · Maintenance & community, Model reading. · Transparency & trust, Closed models under the Customer Agreement (effective 30 September 2026) and the Service Specific Terms, which are public and dated.
- Sources: 30, open questions: 13, both in the full twin
- Capabilities: video.generate, video.image-to-video, video.edit, video.audio
- JSON: https://www.anchorterminal.com/api/v1/tools/seedance-on-byteplus-modelark.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/seedance-on-byteplus-modelark.svg` or a link to https://www.anchorterminal.com/tools/seedance-on-byteplus-modelark from a page on byteplus.com or one of its subdomains, or the README of github.com/volcengine/ark-runtime-go, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

1. POST to `/api/v3/contents/generations/tasks` on ark.ap-southeast.bytepluses.com, then poll GET `/contents/generations/tasks/{id}` or pass `callback_url`. Callbacks need an answer within 5 seconds
2. Download the result at once. Video URLs last 24 hours, task records 7 days, and a Seedance 2.5 URL allows 100 downloads
3. Pass `resolution`, `ratio` and `duration` in the request body. Parameters appended to the prompt as `--rs` or `--dur` are weakly validated and may be ignored
4. On Seedance 2.5 set `omni_reference_task_type` to `edit` or `extend` so constraint errors arrive at submission. With `auto` they arrive after the task leaves the queue
5. Do not send reference images or video with real human faces to Seedance 2.5 or 2.0. Only a queued task can be cancelled with DELETE

## Connect

```bash
python -m pip install --upgrade arkruntime
```

```bash
curl -X POST https://ark.ap-southeast.bytepluses.com/api/v3/contents/generations/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $ARK_API_KEY" \
  -d '{"model":"dreamina-seedance-2-5-260628","content":[{"type":"text","text":"The kitten is yawning at the camera."}],"resolution":"720p","ratio":"16:9","duration":5}'
```

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
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## Panel reviews (0, desk reviews from public material, no calls made)