Bytedance Seedance 2.5

This page is generated from the upstream official OpenAPI documentation. Endpoints, parameters and examples match the official docs; brand and API domain are replaced with ModelFold.

Endpoint

POST /jobs/createTask

Full URL: https://ai.modelfold.online/v1/jobs/createTask

Authentication: every request must include the Authorization: Bearer <API_KEY> header.

Query Task Status

After submitting a task, use the unified query endpoint to check progress and retrieve results:

Get Task Details — Learn how to query task status and retrieve generation results

TIP

In production environments, it is recommended to use the callBackUrl parameter to receive automatic notifications upon completion, rather than polling the status API.

Note
Image-to-Video (First Frame), Image-to-Video (First & Last Frames), and Multimodal Reference-to-Video (including reference images, videos, and audio) are three mutually exclusive scenarios and cannot be used simultaneously.
Multimodal Reference-to-Video can indirectly achieve a "First/Last Frame + Multimodal Reference" effect by specifying reference images as the first or last frame via prompts. If you need to strictly guarantee that the first and last frames are identical to the specified images, prioritize using Image-to-Video (First & Last Frames)

Key Features

Text-to-Video — Generate videos directly from text descriptions without input images
Image-to-Video — First frame, or first and last frames
Multimodal Reference — Up to 30 images, 10 videos and 10 audio clips
Audio Generation — Optional audio generation for enhanced video content

TIP

With reference video(s), billing uses a lower per-second price × (total reference-video duration + output duration); reference images and reference audio do not add billable seconds. With duration = -1, billing follows the duration actually generated. For current prices, see ai.modelfold.online/pricing.

Market Overview — Explore all available models
Common API — Check credits and account usage

Request Parameters

Body (application/json)

Parameter	Type	Required	Description
`model`	`string`	Yes	The model name to use for generation. Required field. - Must be `bytedance/seedance-2-5` for this endpoint Default：`"bytedance/seedance-2-5"`。 Allowed values：`bytedance/seedance-2-5`。示例：`bytedance/seedance-2-5`。
`callBackUrl`	`string`	No	The URL to receive generation task completion updates. Optional but recommended for production use. - System will POST task status and results to this URL when generation completes - Callback includes generated content URLs and task information - Your callback endpoint should accept POST requests with JSON payload containing results - Alternatively, use the Get Task Details endpoint to poll task status - To ensure callback security, see Webhook Verification Guide for signature verification implementation 示例：`https://your-domain.com/api/callback`。
`input`	`object`	Yes	Input parameters for the generation task
`input.prompt`	`string`	No	The text prompt used to generate the video.. ( Max length: 20480 characters) 示例：`A serene beach at sunset with waves gently crashing on the shore, palm trees swaying in the breeze, and seagulls flying across the orange sky`。
`input.first_frame_url`	`string`	No	First frame image url or asset://{assetId} (for example: asset://asset-20260404242101-76djj) Cannot be used simultaneously with reference_image_urls, reference_video_urls, or reference_audio_urls.
`input.last_frame_url`	`string`	No	End frame image url or asset://{assetId} (for example: asset://asset-20260404242101-76djj) last_frame_url cannot be passed alone; first_frame_url must be provided together with it.
`input.reference_image_urls`	`array<string>`	No	Enter a list of image URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj). Single image requirements: Format: jpeg, png, webp. Aspect ratio (width/height): (0.4, 2.5) Width and height (px): (300, 6000) Size: Single image less than 30 MB. Up to 30 images. Mutually exclusive with the first/last-frame scenario;
`input.reference_video_urls`	`array<string>`	No	Enter a list of video URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj) . Single video requirements: Video format: mp4, mov, mkv. Resolution: 480p, 720p Dimensions: Aspect ratio (width/height): [0.4, 2.5] Width/height (px): [300, 6000] Total pixels: [640×640=409600, 834×1112=927408], i.e., the product of width and height must meet the range requirement of [409600, 927408]. Size: Single video not exceeding 200 MB. Frame rate (FPS): [24, 60] Single video duration: [2, 30] seconds; Mutually exclusive with the first/last-frame scenario; Total duration of reference videos must not exceed 30 seconds.
`input.reference_audio_urls`	`array<string>`	No	Enter a list of audio URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj) . Single audio requirements: Format: wav, mp3, aac, ogg Size: Single audio file size not exceeding 15 MB. Single audio duration: [2, 30] seconds; mutually exclusive with first/last frames; total duration of reference audio must not exceed 30 seconds.
`input.return_last_frame`	`boolean`	No	Whether to also return the last frame of the generated video as a JPEG (in resultJson.lastFrameUrl). Default false. Default：`false`。示例：`false`。
`input.generate_audio`	`boolean`	No	Whether to generate audio synchronized with the video. Default: true. Default：`true`。示例：`false`。
`input.resolution`	`string`	No	Video resolution - 480p for faster generation, 720p for balance. Default：`"720p"`。 Allowed values：`480p` / `720p` / `1080p`。示例：`720p`。
`input.aspect_ratio`	`string`	No	Video aspect ratio configuration. Default：`"adaptive"`。 Allowed values：`1:1` / `4:3` / `3:4` / `16:9` / `9:16` / `21:9` / `adaptive`。示例：`adaptive`。
`input.duration`	`integer`	No	Video duration in 4-30 seconds. Special values -1: Pass -1 for automatic duration selection — the model picks a suitable duration itself (for video-editing tasks, it matches the input video's length; for other task types, it selects within the valid range), instead of you specifying an exact value. Default：`5`。示例：`5`。
`input.output_format`	`string`	No	Video output format. Default：`"mp4"`。 Allowed values：`mp4` / `mov`。示例：`mp4`。
`input.web_search`	`boolean`	No	Enable online search.
`input.draft`	`boolean`	No	Enable draft mode. When enabled, only 480p resolution is allowed. Draft task ID is valid for 7 days from draft creation. Default：`false`。示例：`false`。
`input.nsfw_checker`	`boolean`	No	Defaults to false. When false, no additional content filtering is applied and results are returned directly by the model.

Request Example

bash

curl -X POST "https://ai.modelfold.online/v1/jobs/createTask" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "bytedance/seedance-2-5",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "prompt": "A tranquil beach at sunset, with gentle waves lapping the shore, palm trees swaying in the breeze, and seagulls flying across the orange sky.",
    "reference_image_urls": [
      "https://example.com/your-image.png"
    ],
    "reference_video_urls": [
      "https://example.com/your-video.mp4"
    ],
    "reference_audio_urls": [
      "https://example.com/your-audio.mp3"
    ],
    "return_last_frame": false,
    "generate_audio": false,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "duration": 15
  }
}'

json

{
  "model": "bytedance/seedance-2-5",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "prompt": "A tranquil beach at sunset, with gentle waves lapping the shore, palm trees swaying in the breeze, and seagulls flying across the orange sky.",
    "reference_image_urls": [
      "https://example.com/your-image.png"
    ],
    "reference_video_urls": [
      "https://example.com/your-video.mp4"
    ],
    "reference_audio_urls": [
      "https://example.com/your-audio.mp3"
    ],
    "return_last_frame": false,
    "generate_audio": false,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "duration": 15
  }
}

Response

200 — Request successful

json

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_bytedance_1765186743319"
  }
}

Callback

videoTaskCompleted

Callback URL: {request.body#/callBackUrl} (the callBackUrl in the request body).

The system sends this callback when the bytedance/seedance-2-5 task succeeds or fails.

Callback body parameters

参数	类型	必填	说明
`code`	`integer`	是	Unified callback code: 200 for success, 501 for failure. Allowed values：`200` / `501`。示例：`200`。
`msg`	`string`	是	Unified callback message. Allowed values：`Playground task completed successfully.` / `Playground task failed.`。示例：`Playground task completed successfully.`。
`data`	`object`	是	—
`data.taskId`	`string`	是	The unique task identifier.
`data.model`	`string`	是	The model used for the task. Allowed values：`bytedance/seedance-2-5`。示例：`bytedance/seedance-2-5`。
`data.state`	`string`	是	Terminal task state. Allowed values：`success` / `fail`。示例：`success`。
`data.param`	`string`	是	JSON string containing the submitted task parameters.
`data.resultJson`	`string`	否	JSON string. On success it contains resultUrls; when return_last_frame is true it also contains lastFrameUrl (JPEG). Present only when state is success.
`data.failCode`	`string`	否	Failure code, a numeric string such as "400" or "500". Present only when state is fail.
`data.failMsg`	`string`	否	Failure reason. Present only when state is fail.
`data.costTime`	`integer`	否	Processing time in seconds. Present on both success and failure callbacks.
`data.completeTime`	`integer`	否	Task completion timestamp.
`data.createTime`	`integer`	否	Task creation timestamp.
`data.updateTime`	`integer`	否	Use completeTime as the completion time; updateTime may equal createTime.
`data.creditsConsumed`	`number`	否	Credits consumed by the task; 0 for failed tasks.

Task completed successfully

json

{
  "code": 200,
  "msg": "Playground task completed successfully.",
  "data": {
    "taskId": "task_example_video_webhook_001",
    "model": "bytedance/seedance-2-5",
    "state": "success",
    "param": "{\"input\":\"{}\",\"callBackUrl\":\"https://example.com/callback\",\"model\":\"bytedance/seedance-2-5\"}",
    "resultJson": "{\"resultUrls\":[\"https://example.com/generated-video.mp4\"],\"lastFrameUrl\":[\"https://example.com/last-frame.jpg\"]}",
    "costTime": 12,
    "completeTime": 1234567890,
    "createTime": 1234560000,
    "updateTime": 1234567890,
    "creditsConsumed": 1.23
  }
}

Task failed

json

{
  "code": 501,
  "msg": "Playground task failed.",
  "data": {
    "taskId": "task_example_video_webhook_001",
    "model": "bytedance/seedance-2-5",
    "state": "fail",
    "param": "{\"input\":\"{}\",\"callBackUrl\":\"https://example.com/callback\",\"model\":\"bytedance/seedance-2-5\"}",
    "failCode": "400",
    "failMsg": "<error detail>",
    "costTime": 12,
    "creditsConsumed": 0
  }
}

Bytedance Seedance 2.5 ​

Endpoint ​

Query Task Status ​

Key Features ​

Related Resources ​

Request Parameters ​

Body (application/json) ​

Request Example ​

Response ​

200 — Request successful ​

Callback ​

videoTaskCompleted ​

Bytedance Seedance 2.5

Endpoint

Query Task Status

Key Features

Related Resources

Request Parameters

Body (application/json)

Request Example

Response

200 — Request successful

Callback

videoTaskCompleted