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Seedance 2.5

Seedance 2.5 is ByteDance Seed's next-generation audio-video joint generation model, built on the unified multimodal architecture introduced with Seedance 2.0 and aimed at the thing short-clip models cannot do: telling a complete story in one generation.

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API DOCS / SIMPLIFIED

Integrate this model with one task-based API flow

Seedance 2.5 is ByteDance Seed's next-generation audio-video joint generation model, built on the unified multimodal architecture introduced with Seedance 2.0 and aimed at the thing short-clip models cannot do: telling a complete story in one generation. The examples below are rendered from Seedance 2.5, the current gateway base URL, and the selected public model contract.

Input mode
X-API-Key on every request
POST /api/v1/openapi/task
GET /api/v1/openapi/task/status/{task_id}
Async task workflow

Single code window

Switch language once. Each example already includes both the task creation request and the task status polling request.

Unified Example
API_KEY="<API_KEY>"
BASE_URL="https://api.musespark.ai"
REQUEST_BODY='{
  "model_id": "seedance-2-5",
  "parameters": {
    "prompt": "A cinematic drone shot over a futuristic city at sunrise, volumetric light, realistic motion",
    "resolution": "720p",
    "duration": 5,
    "generate_audio": true,
    "aspect_ratio": "adaptive",
    "batch_size": 1
  }
}'

CREATE_RESPONSE=$(curl --request POST "$BASE_URL/api/v1/openapi/task" \
  --header "X-API-Key: $API_KEY" \
  --header "Content-Type: application/json" \
  --data-raw "$REQUEST_BODY")

TASK_ID="<TASK_ID_FROM_CREATE_RESPONSE>"

curl "$BASE_URL/api/v1/openapi/task/status/$TASK_ID" \
  --header "X-API-Key: $API_KEY"

Request and response JSON become the documentation

Keep the payload and task status envelope as the primary contract. Field descriptions, optionality, and enum hints now live inline as JSON comments.

Request Body

Caller payload

This is the request envelope accepted by the public gateway for the selected model contract.

Field comments and caller parameters come directly from the current item's model schema.
{
"model_id": "seedance-2-5",// target model
"parameters": {
"prompt": "A cinematic drone shot over a futuristic city at sunrise, volumetric light, realistic motion",// required nonblank generation prompt · min 1 · min length 1
"resolution": "720p",// enum: 480p | 720p | 1080p
"duration": 5,// output video duration in seconds. Supports 4-30 seconds or -1 for automatic duration; omitted defaults to 5 seconds · max 30 · enum: Auto | 4s | 5s | 6s | 7s | 8s | 9s | 10s | 11s | 12s | 13s | 14s | 15s | 16s | 17s | 18s | 19s | 20s | 21s | 22s | 23s | 24s | 25s | 26s | 27s | 28s | 29s | 30s
"generate_audio": true,// generate audio. Defaults to true; also accepted upstream as audio
"aspect_ratio": "adaptive",// output aspect ratio. Supports 16:9, 4:3, 1:1, 3:4, 9:16, 21:9, or adaptive. Video edit, extend, and first/last-frame tasks require adaptive · enum: 16:9 | 4:3 | 1:1 | 3:4 | 9:16 | 21:9 | adaptive
"batch_size": 1// standard quantity control field. The allowed range for this item is 1-4 · min 1 · max 4
}
}
Response Body

Gateway response

This is the task status response you will query with task_id until the task reaches a terminal state.

Poll every 2-5 seconds and stop once status becomes completed, failed, cancelled.
{
"code": 200,// 200 on success
"msg": "success",
"data": {
"task_id": "task_01HQX8N2QJ0YQ8Q0T7G6N4V6K2",// use for status polling
"status": "completed",// enum: queued | running | completed | failed | cancelled
"progress": 100,// 0-100 if available
"completed_at": 1760000000,// unix timestamp
"expires_at": 1760001800,// unix timestamp
"result": {
"output_urls": [// generated files
"https://cdn.example.com/output.png"
]
}
}
}