Kling V2.1 Pro

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

For production use, we recommend using the callBackUrl parameter to receive automatic notifications when generation completes, rather than polling the status endpoint.

Related Resources

• 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 kling/v2-1-pro for this endpoint Default："kling/v2-1-pro"。 Allowed values：kling/v2-1-pro。 示例：kling/v2-1-pro。
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	No	Input parameters for the generation task
input.prompt	string	Yes	Text prompt describing the video to generate (Max length: 5000 characters) 示例：POV shot of a gravity surfer diving between ancient ruins suspended midair, glowing moss lights the path, the board hisses as it carves through thin mist, echoes rise with speed 。
input.image_url	string	Yes	URL of the image to be used for the video (File URL after upload, not file content; Accepted types: image/jpeg, image/png; Max size: 10.0MB) 示例：https://example.com/your-image.png。
input.duration	string	Yes	Required. "5" or "10" (seconds). Allowed values：5 / 10。 示例：5。
input.negative_prompt	string	No	Terms to avoid in the generated video (Max length: 500 characters) 示例：blur, distort, and low quality。
input.cfg_scale	number	No	The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt (Min: 0, Max: 1, Step: 0.1) (step: 0.1) Default：0.5。 示例：0.5。
input.tail_image_url	string	No	URL of the image to be used for the end of the video (File URL after upload, not file content; Accepted types: image/jpeg, image/png; Max size: 10.0MB) 示例：``。

Request Example

curl -X POST "https://ai.modelfold.online/v1/jobs/createTask" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "kling/v2-1-pro",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "prompt": "POV shot of a gravity surfer diving between ancient ruins suspended midair, glowing moss lights the path, the board hisses as it carves through thin mist, echoes rise with speed ",
    "image_url": "https://example.com/your-image.png",
    "duration": "5",
    "negative_prompt": "blur, distort, and low quality",
    "cfg_scale": 0.5,
    "tail_image_url": ""
  }
}'

{
  "model": "kling/v2-1-pro",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "prompt": "POV shot of a gravity surfer diving between ancient ruins suspended midair, glowing moss lights the path, the board hisses as it carves through thin mist, echoes rise with speed ",
    "image_url": "https://example.com/your-image.png",
    "duration": "5",
    "negative_prompt": "blur, distort, and low quality",
    "cfg_scale": 0.5,
    "tail_image_url": ""
  }
}

Response

200 — Request successful

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_kling_1765187774173"
  }
}

Callback

videoTaskCompleted

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

The system sends this callback when the kling/v2-1-pro 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：kling/v2-1-pro。 示例：kling/v2-1-pro。
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 containing resultUrls, firstFrameUrl, lastFrameUrl, or resultObject when successful. 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

{
  "code": 200,
  "msg": "Playground task completed successfully.",
  "data": {
    "taskId": "task_example_video_webhook_001",
    "model": "kling/v2-1-pro",
    "state": "success",
    "param": "{\"input\":\"{\\\"prompt\\\":\\\"POV shot of a gravity surfer diving between ancient ruins suspended midair, glowing moss lights the path, the board h...\\\",\\\"image_url\\\":\\\"https://example.com/input-image.jpg\\\",\\\"duration\\\":\\\"5\\\",\\\"negative_prompt\\\":\\\"blur, distort, and low quality\\\",\\\"cfg_scale\\\":0.5,\\\"tail_image_url\\\":\\\"https://example.com/input-image.jpg\\\"}\",\"callBackUrl\":\"https://example.com/callback\",\"model\":\"kling/v2-1-pro\"}",
    "resultJson": "{\"resultUrls\":[\"https://example.com/generated-video.mp4\"]}",
    "costTime": 12,
    "completeTime": 1234567890,
    "createTime": 1234560000,
    "updateTime": 1234567890,
    "creditsConsumed": 1.23
  }
}

Task failed

{
  "code": 501,
  "msg": "Playground task failed.",
  "data": {
    "taskId": "task_example_video_webhook_001",
    "model": "kling/v2-1-pro",
    "state": "fail",
    "param": "{\"input\":\"{\\\"prompt\\\":\\\"POV shot of a gravity surfer diving between ancient ruins suspended midair, glowing moss lights the path, the board h...\\\",\\\"image_url\\\":\\\"https://example.com/input-image.jpg\\\",\\\"duration\\\":\\\"5\\\",\\\"negative_prompt\\\":\\\"blur, distort, and low quality\\\",\\\"cfg_scale\\\":0.5,\\\"tail_image_url\\\":\\\"https://example.com/input-image.jpg\\\"}\",\"callBackUrl\":\"https://example.com/callback\",\"model\":\"kling/v2-1-pro\"}",
    "failCode": "400",
    "failMsg": "<error detail>",
    "costTime": 12,
    "creditsConsumed": 0
  }
}