APIByteDanceSeedance series

Limitations

Known differences from the reference compatible API.

Not supported

draft / draft_task creation.
AK/SK asset-library signing.
service_tier as a list filter.
Arbitrary time ranges; lists cover the last 7 days.
Live query, cancel, assets and callbacks for every model service.
Compatible param / type fields in errors.

Behavior differences

Item	Current behavior
Task IDs	`id` is the compatible task ID, possibly empty; `task_id` is the platform ID
Query	Some tasks are updated by platform polling and may lag and may lag
List	At most 1000 rows scanned; `total` is the window count
Cancel	Subject to platform and service support
Assets	Bearer proxy, not AK/SK signing
Media	native URL, or platform-signed proxy valid for about 24 hours
Internal fields	`service_*` is never returned

Recommendations

Use task_id when you need a stable task identifier.
Do not create tasks to probe models, because it may incur charges.
Download videos to your own storage before signed URLs expire.

Full example

Create, poll and download a video.

FAQ

Common questions and limitations.

On this page

Behavior differences

Recommendations