# Grok Imagine - Video Extend
## OpenAPI Specification
```yaml
openapi: 3.0.1
info:
title: ''
description: ''
version: 1.0.0
paths:
/api/v1/jobs/createTask:
post:
summary: Grok Imagine - Video Extend
deprecated: false
description: >-
## Task ID Source
The `task_id` parameter should be obtained from the previously generated
video task. You can create videos using the following approach:
Use the text-to-video model to create videos in order to obtain scalable task IDs
**How to obtain the task ID:**
1. Use the [Text to Video API](/cn/market/grok-imagine/text-to-video) to
generate a video
2. Extract the `taskId` from the API response
3. Use this `taskId` as the `task_id` parameter in the enlargement
request
:::info[Information]
Only videos generated by **Kie AI models** can be extended. External
videos are not supported.
:::
---
## Query Task Status
After submitting the extended task, use the unified query endpoint to
check the progress and obtain the results:
Learn how to query task status and retrieve generation results.
:::tip[Pro Tip]
For production use, we recommend using the `callBackUrl` parameter to
receive automatic notifications when upscaling completes, rather than
polling the status endpoint.
:::
---
## Related Resources
Explore all available models
Check credits and account usage
operationId: grok-imagine-extend
tags:
- docs/en/Market/Video Models/Grok Imagine
parameters: []
requestBody:
content:
application/json:
schema:
type: object
properties:
model:
type: string
description: |-
The model name to use for generation. Required field.
- Must be `grok-imagine/extend` for this endpoint
enum:
- grok-imagine/extend
default: grok-imagine/extend
examples:
- grok-imagine/extend
x-apidog-enum:
- value: grok-imagine/extend
name: ''
description: ''
callBackUrl:
type: string
format: uri
description: >-
Receive the URL for the update of the video extension task
completion. It is optional but recommended to use in a
production environment.
- When the video expansion is completed, the system will
POST the task status and results to this URL.
- The callback includes the generated enlarged video URL and
task information.
- Your callback endpoint should accept a POST request with a
JSON payload containing the video results.
- Alternatively, you can poll the task status using the task
details retrieval endpoint.
- To ensure the security of the callback, please refer to
the [Webhook Verification Guide]
(/common-api/webhook-verification) for the implementation
method of signature verification.
examples:
- https://your-domain.com/api/callback
input:
type: object
description: Input parameters for the video upscaling task
properties:
task_id:
type: string
description: >-
Task ID from a previously successful video generation
task. Required field.
- Must be from a Kie AI video generation model (e.g.,
grok-imagine/text-to-video)
- The original video generation must have completed
successfully
- Only Kie AI–generated task IDs are supported
maxLength: 100
examples:
- task_grok_12345678
prompt:
type: string
description: >-
Text instructions describing the required movement of
the video. Required field.
- Provide a detailed description of how you would like
the video to expand and continue.
- You can specify camera movements, scene changes,
object actions, etc.
- The more specific the prompt words are, the more
likely the generated effect will match your
expectations.
- Supports input in both Chinese and English.
examples:
- >-
The camera slowly pans forward, showing the
protagonist walking deeper into the forest, with the
sunlight filtering through the leaves and casting
dappled shadows.
extend_at:
type: number
description: >-
The starting position of the video extension. Optional
field.
default: 2
examples:
- 2
minimum: 2
extend_times:
type: number
description: >-
Duration of video extension (in seconds). Required
field.
- `6`: Expand 6 seconds of video content
- `10`: Expand 10 seconds of video content
- The longer the extension duration, the longer the time
required for generation
- Select the appropriate duration based on the
complexity of the scene
required:
- task_id
- prompt
- extend_at
- extend_times
x-apidog-orders:
- task_id
- prompt
- extend_at
- extend_times
x-apidog-ignore-properties: []
required:
- model
- input
x-apidog-orders:
- model
- callBackUrl
- input
examples:
- model: grok-imagine/upscale
callBackUrl: https://your-domain.com/api/callback
input:
task_id: task_grok_12345678
x-apidog-ignore-properties: []
example:
model: grok-imagine/extend
callBackUrl: https://your-domain.com/api/callback
input:
task_id: task_grok_12345678
prompt: ''
extend_at: 2
extend_times: '6'
responses:
'200':
description: Request successful
content:
application/json:
schema:
allOf:
- $ref: '#/components/schemas/ApiResponse'
example:
code: 200
msg: success
data:
taskId: 281e5b0*********************f39b9
headers: {}
x-apidog-name: ''
security:
- BearerAuth: []
x-apidog:
schemeGroups:
- id: kn8M4YUlc5i0A0179ezwx
schemeIds:
- BearerAuth
required: true
use:
id: kn8M4YUlc5i0A0179ezwx
scopes:
kn8M4YUlc5i0A0179ezwx:
BearerAuth: []
callbacks:
videoTaskCompleted:
'{request.body#/callBackUrl}':
post:
description: >-
The system sends this callback when the `grok-imagine/extend`
task succeeds or fails.
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- code
- msg
- data
properties:
code:
type: integer
description: >-
Unified callback code: 200 for success, 501 for
failure.
enum:
- 200
- 501
msg:
type: string
description: Unified callback message.
enum:
- Playground task completed successfully.
- Playground task failed.
data:
type: object
required:
- taskId
- model
- state
- param
- resultJson
- failCode
- failMsg
properties:
taskId:
type: string
description: The unique task identifier.
model:
type: string
description: The model used for the task.
enum:
- grok-imagine/extend
state:
type: string
description: Terminal task state.
enum:
- success
- fail
param:
type: string
description: >-
JSON string containing the submitted task
parameters.
resultJson:
type: string
nullable: true
description: >-
JSON string containing resultUrls,
firstFrameUrl, lastFrameUrl, or resultObject
when successful. Null when failed.
failCode:
type: string
nullable: true
description: Null when successful; failure code when failed.
failMsg:
type: string
nullable: true
description: >-
Null when successful; failure message when
failed.
costTime:
type: integer
format: int64
description: >-
Task processing time. Present on successful
callbacks.
completeTime:
type: integer
format: int64
description: Task completion timestamp.
createTime:
type: integer
format: int64
description: Task creation timestamp.
updateTime:
type: integer
format: int64
description: Task update timestamp.
creditsConsumed:
type: number
description: >-
Credits consumed by the task. Present on
successful callbacks.
examples:
success:
summary: Task completed successfully
value:
code: 200
msg: Playground task completed successfully.
data:
taskId: task_example_video_webhook_001
model: grok-imagine/extend
state: success
param: >-
{"input":"{\"task_id\":\"task_grok_12345678\",\"prompt\":\"\",\"extend_at\":2,\"extend_times\":\"6\"}","callBackUrl":"https://example.com/callback","model":"grok-imagine/extend"}
resultJson: >-
{"resultUrls":["https://example.com/generated-video.mp4"]}
failCode: null
failMsg: null
costTime: 12
completeTime: 1234567890
createTime: 1234560000
updateTime: 1234567890
creditsConsumed: 1.23
failure:
summary: Task failed
value:
code: 501
msg: Playground task failed.
data:
taskId: task_example_video_webhook_001
model: grok-imagine/extend
state: fail
param: >-
{"input":"{\"task_id\":\"task_grok_12345678\",\"prompt\":\"\",\"extend_at\":2,\"extend_times\":\"6\"}","callBackUrl":"https://example.com/callback","model":"grok-imagine/extend"}
failCode: GENERATION_FAILED
failMsg: The generation task failed.
responses:
'200':
description: Callback received successfully.
content:
application/json:
schema:
type: object
properties:
code:
type: integer
example: 200
msg:
type: string
example: success
example:
code: 200
msg: success
x-apidog-folder: docs/en/Market/Video Models/Grok Imagine
x-apidog-status: released
x-run-in-apidog: https://app.apidog.com/web/project/1184766/apis/api-31353004-run
components:
schemas:
ApiResponse:
type: object
properties:
code:
type: integer
description: >-
Response status code
- **200**: Success - Request has been processed successfully
- **401**: Unauthorized - Authentication credentials are missing or
invalid
- **402**: Insufficient Credits - Account does not have enough
credits to perform the operation
- **404**: Not Found - The requested resource or endpoint does not
exist
- **422**: Validation Error - The request parameters failed
validation checks
- **429**: Rate Limited - Request limit has been exceeded for this
resource
- **433**: Request Limit - Sub-key Usage Exceeds Limit
- **455**: Service Unavailable - System is currently undergoing
maintenance
- **500**: Server Error - An unexpected error occurred while
processing the request
- **501**: Generation Failed - Content generation task failed
- **505**: Feature Disabled - The requested feature is currently
disabled
enum:
- 200
- 401
- 402
- 404
- 422
- 429
- 433
- 455
- 500
- 501
- 505
x-apidog-enum:
- value: 200
name: ''
description: ''
- value: 401
name: ''
description: ''
- value: 402
name: ''
description: ''
- value: 404
name: ''
description: ''
- value: 422
name: ''
description: ''
- value: 429
name: ''
description: ''
- value: 433
name: ''
description: ''
- value: 455
name: ''
description: ''
- value: 500
name: ''
description: ''
- value: 501
name: ''
description: ''
- value: 505
name: ''
description: ''
msg:
type: string
description: Response message, error description when failed
examples:
- success
data:
type: object
properties:
taskId:
type: string
description: >-
Task ID, can be used with Get Task Details endpoint to query
task status
x-apidog-orders:
- taskId
required:
- taskId
x-apidog-ignore-properties: []
x-apidog-orders:
- code
- msg
- data
title: response not with recordId
required:
- data
x-apidog-ignore-properties: []
x-apidog-folder: ''
securitySchemes:
BearerAuth:
type: bearer
scheme: bearer
bearerFormat: API Key
description: >-
All API requests require a Bearer Token. Add the header `Authorization:
Bearer YOUR_API_KEY` to authenticate requests.
BearerAuth1:
type: bearer
scheme: bearer
bearerFormat: API Key
description: >-
所有 API 请求都需要 Bearer Token。请在请求头中添加 `Authorization: Bearer YOUR_API_KEY`
进行身份验证。
servers:
- url: https://api.kie.ai
description: 正式环境
security:
- BearerAuth: []
x-apidog:
schemeGroups:
- id: kn8M4YUlc5i0A0179ezwx
schemeIds:
- BearerAuth
required: true
use:
id: kn8M4YUlc5i0A0179ezwx
scopes:
kn8M4YUlc5i0A0179ezwx:
BearerAuth: []
```