Grok Imagine - Video Upscale

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.

Output is an MP4 video with an audio track generated together with the video (dialogue written in the prompt is spoken). Audio cannot be turned off.

Task ID Source

task_id must be a successful grok-imagine/text-to-video or grok-imagine/image-to-video task. You can create such videos with:

• Generate videos First — Create videos using the text-to-video model to get a task ID for upscaling.

How to get a task ID:

1. Use the Text to video API to generate videos.
2. Extract the taskId from the API response.
3. Use that taskId as the task_id parameter in the upscale request.

Information

Only videos generated by ModelFold AI models can be upscaled. External videos are not supported.

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Query Task Status

After submitting an upscale 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.

Pro Tip

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

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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 grok-imagine/upscale for this endpoint Default："grok-imagine/upscale"。 Allowed values：grok-imagine/upscale。 示例：grok-imagine/upscale。
callBackUrl	string	No	The URL to receive video upscaling task completion updates. Optional but recommended for production use. - System will POST task status and results to this URL when upscaling completes - Callback includes generated upscaled video URLs and task information - Your callback endpoint should accept POST requests with JSON payload containing video 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 video upscaling task
input.task_id	string	Yes	Task ID from a previously successful video generation task. Required field. - task_id must be a successful grok-imagine/text-to-video or grok-imagine/image-to-video task. - The original video generation must have completed successfully - Only ModelFold AI–generated task IDs are supported 示例：task_grok_12345678。
input.resolution	string	No	Video generation resolution. Default："720p"。 Allowed values：720p / 1080p。 示例：720p。

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": "grok-imagine/upscale",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "task_id": "task_grok_12345678"
  }
}'

{
  "model": "grok-imagine/upscale",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "task_id": "task_grok_12345678"
  }
}

Response

200 — Request successful

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "281e5b0*********************f39b9"
  }
}

Callback

videoTaskCompleted

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

The system sends this callback when the grok-imagine/upscale 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：grok-imagine/upscale。 示例：grok-imagine/upscale。
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": "grok-imagine/upscale",
    "state": "success",
    "param": "{\"input\":\"{\\\"task_id\\\":\\\"task_grok_12345678\\\"}\",\"callBackUrl\":\"https://example.com/callback\",\"model\":\"grok-imagine/upscale\"}",
    "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": "grok-imagine/upscale",
    "state": "fail",
    "param": "{\"input\":\"{\\\"task_id\\\":\\\"task_grok_12345678\\\"}\",\"callBackUrl\":\"https://example.com/callback\",\"model\":\"grok-imagine/upscale\"}",
    "failCode": "400",
    "failMsg": "<error detail>",
    "costTime": 12,
    "creditsConsumed": 0
  }
}