Grok Video

Overview

Grok Video is an xAI video model for text-to-video generation and image-to-video workflows. Use this page when you are ready to call the API after trying the model in the APIXO playground.

Capability	Value
Model ID	`grok-video`
Modes	`text-to-video`, `image-to-video`
Prompt length	1-5000 characters
Duration	6-30 seconds
Resolutions	`480p`, `720p`
Aspect ratios	`1:1`, `3:2`, `2:3`, `16:9`, `9:16`
Image-to-video sources	1 image URL, or a completed `grok-image` task with `task_id` and `index`
Output	MP4 video URL in `resultJson.resultUrls`

Endpoint and authentication

Base URL:

https://api.apixo.ai/api/v1

Method	Endpoint	Purpose
`POST`	`/generateTask/grok-video`	Submit a generation task
`GET`	`/statusTask/grok-video?taskId={taskId}`	Poll task status and retrieve results

All requests require your APIXO API key:

Authorization: Bearer YOUR_API_KEY

Submit requests also require:

Content-Type: application/json

Copy-paste async quickstart

This minimal request submits a text-to-video task and returns a taskId.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/grok-video" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-video",
      "prompt": "a peaceful lakeside at sunset with gentle waves",
      "duration": 6,
      "resolution": "480p",
      "aspect_ratio": "3:2",
      "style": "normal"
    }
  }'

Successful response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Save the taskId; you need it to poll for the final result.

Poll for result

curl -X GET "https://api.apixo.ai/api/v1/statusTask/grok-video?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Processing response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "processing",
    "createTime": 1767965610929
  }
}

Success response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://file.apixo.ai/xxx.mp4\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965655929,
    "costTime": 45000
  }
}

Failed response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "SensitiveContent",
    "failMsg": "Content violates provider policy, please adjust the prompt",
    "createTime": 1767965610929,
    "completeTime": 1767965620132
  }
}

Parse resultJson after state becomes success:

const payload = JSON.parse(data.resultJson);
const videoUrls = payload.resultUrls;

Request body

Text-to-video

{
  "request_type": "async",
  "input": {
    "mode": "text-to-video",
    "prompt": "a cinematic city street after rain, soft reflections, slow camera push",
    "duration": 6,
    "resolution": "480p",
    "aspect_ratio": "3:2",
    "style": "normal"
  }
}

Image-to-video with an image URL

{
  "request_type": "async",
  "input": {
    "mode": "image-to-video",
    "prompt": "make this scene into a short cinematic pan",
    "image_urls": [
      "https://example.com/ref.jpg"
    ],
    "duration": 10,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "style": "fun"
  }
}

Image-to-video from a Grok Image task

{
  "request_type": "async",
  "input": {
    "mode": "image-to-video",
    "prompt": "turn this character into a walking animation",
    "task_id": "task_previous_grok_image",
    "index": 0,
    "duration": 10,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "style": "spicy"
  }
}

Parameters

request_type

string

default:"async"

Result delivery mode. Omit this field or use async for polling with statusTask, or use callback for webhook delivery.

callback_url

string

Required when request_type is callback. Provide a public HTTPS URL that can receive the final task payload. See Webhooks.

input

object

required

Grok Video input parameters.

Show properties

mode

string

required

Generation mode. Supported values: text-to-video, image-to-video.

prompt

string

required

Text prompt describing the desired video. Supports 1-5000 characters. Empty prompts are rejected.

duration

integer|string

required

Output duration in seconds. Supports integers from 6 through 30. Numeric strings such as "10" are accepted and normalized before billing.

resolution

string

required

Output resolution. Supported values: 480p, 720p. Values are trimmed and normalized to lowercase.

aspect_ratio

string

Output aspect ratio. Supported values: 1:1, 3:2, 2:3, 16:9, 9:16. If omitted, text-to-video uses 3:2 and image-to-video uses 16:9.

style

string

default:"normal"

Motion style. Supported values: fun, normal, spicy. The provider manual positions spicy for task continuation or recreation workflows.

image_urls

string[]

Reference image URLs for the direct image-to-video method. Supports at most 1 public, non-empty URL. Do not combine this with the task_id + index method.

task_id

string

APIXO task ID from a completed grok-image task. Use with index for image-to-video task continuation. The task must exist and must have completed successfully.

index

integer

Result index from the completed grok-image task. Required with task_id. Supported range: 0 through 5.

Response format

Submit task response

POST /generateTask/grok-video returns a task ID when the task is accepted:

code

integer

API status code. 200 means the task was accepted.

message

string

Human-readable status message.

data.taskId

string

Unique task identifier used with the status endpoint.

Status response fields

taskId

string

Unique task identifier.

state

string

Current task state: processing, success, or failed.

resultJson

string

JSON string containing the generated video URLs in resultUrls. Present when state is success.

failCode

string

Machine-readable failure code. Present when state is failed.

failMsg

string

Human-readable failure message. Present when state is failed.

createTime

integer

Task creation timestamp in Unix milliseconds.

completeTime

integer

Task completion timestamp in Unix milliseconds. Present after completion.

costTime

integer

Processing duration in milliseconds. Present after completion.

Webhook callback mode

Use callback mode when your backend should receive the final result automatically instead of polling.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/grok-video" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/webhooks/apixo",
    "input": {
      "mode": "text-to-video",
      "prompt": "a clean product reveal video with a slow camera push-in",
      "duration": 6,
      "resolution": "480p",
      "aspect_ratio": "3:2",
      "style": "normal"
    }
  }'

Callback delivery uses the same final payload shape as the status response. See Webhooks for delivery requirements and retry behavior.

Billing

Grok Video is billed per second. The selected resolution determines the per-second unit price, and the submitted duration determines the billable seconds.

Resolution	APIXO price	Minimum valid request cost
`480p`	`$0.015 / second`	`$0.09` for 6 seconds
`720p`	`$0.03 / second`	`$0.18` for 6 seconds

Formula:

total cost = duration * resolution unit price

For current route and market comparison pricing, see Pricing.

Latency and polling

The user manual lists typical Grok Video generation time at about 40s-60s. Actual latency may vary by prompt complexity, duration, resolution, provider queue load, and storage transfer time.

Workload	Typical generation time	Recommended first poll	Poll interval
`480p` or `720p`, 6-30 seconds	About 40s-60s	30s after task creation	5s

For production workloads, use callback mode to avoid frequent polling while video tasks run.

Result URLs are valid for 15 days. Download and store important outputs promptly. For image-to-video, use exactly one source method: either image_urls, or task_id with index. Public image URLs should point directly to JPG, PNG, or WebP files and should be accessible by APIXO. Prompts can be written in English or Chinese. More specific camera motion, scene timing, subject action, lighting, and style details usually produce better results. Rate limits and concurrency can vary by account, API key, and route. If you receive 429, slow down requests and retry with backoff. For account-level details, see System APIs.

Errors and troubleshooting

HTTP errors

Code	Meaning	What to do
`400`	Invalid request body, missing `mode`, missing `prompt`, invalid `duration`, invalid `resolution`, malformed image input, or invalid `task_id` / `index`	Fix the request before retrying
`401`	Missing or invalid API key	Check the `Authorization` header
`402`	Insufficient balance or quota	Add balance or switch account/key
`404`	Task not found when polling	Check the `taskId`
`429`	Rate limit or concurrency limit reached	Retry with exponential backoff
`500`	Internal error or unknown task failure	Retry with backoff or contact support if it persists
`502`	Upstream provider or network error	Retry with backoff
`503`	Service temporarily unavailable	Retry later
`504`	Upstream timeout	Retry later or use callback mode for long-running jobs

Validation notes

Parameter	Backend behavior
`input.mode`	Required for routing. Must be `text-to-video` or `image-to-video`.
`input.prompt`	Required string. Must not be empty and must not exceed 5000 characters.
`input.duration`	Required. Accepts an integer or an integer string. Must resolve to a value from `6` through `30`.
`input.resolution`	Required string. `480p` and `720p` are accepted after trimming and lowercasing.
`input.aspect_ratio`	Optional. Must be one of `1:1`, `3:2`, `2:3`, `16:9`, `9:16` when provided. Defaults are `3:2` for `text-to-video` and `16:9` for `image-to-video`.
`input.image_urls`	For `image-to-video`, one accepted source method. Must be an array of non-empty strings and cannot contain more than 1 URL.
`input.task_id`	For `image-to-video`, the alternate source method. Must be an existing completed APIXO `grok-image` task.
`input.index`	Required with `task_id`. Must be an integer from `0` through `5`.
`input.style`	Optional. Must be `fun`, `normal`, or `spicy`; defaults to `normal` when omitted.

Task failure codes

failCode is generated from APIXO’s mapped provider error. Common values include:

Fail code	Meaning	What to do
`SensitiveContent`	Prompt or input/output content was rejected by safety checks	Change the prompt or reference image
`PromptInvalid`	Prompt was invalid or rejected by the provider	Rewrite the prompt and retry
`ImageFormatIncorrect`	Reference image format could not be processed	Use a public, direct image URL in a common image format
`RateLimited`	Provider rate limit was reached	Retry with exponential backoff
`Timeout`	Provider timeout	Retry later or use callback mode
`InternalError`	Provider or APIXO service was temporarily unavailable	Retry later
`Unknown error`	Provider returned an unmapped failure	Retry with backoff or contact support with the `taskId`

See Error Codes for the full error reference.

Getting Started

Image Models

Video Models

Audio Models

Overview

Endpoint and authentication

Copy-paste async quickstart

Poll for result

Request body

Text-to-video

Image-to-video with an image URL

Image-to-video from a Grok Image task

Parameters

Response format

Submit task response

Status response fields

Webhook callback mode

Billing

Latency and polling

Errors and troubleshooting

HTTP errors

Validation notes

Task failure codes

Getting Started

Image Models

Video Models

Audio Models

Documentation Index

​Overview

​Endpoint and authentication

​Copy-paste async quickstart

​Poll for result

​Request body

​Text-to-video

​Image-to-video with an image URL

​Image-to-video from a Grok Image task

​Parameters

​Response format

​Submit task response

​Status response fields

​Webhook callback mode

​Billing

​Latency and polling

​Errors and troubleshooting

​HTTP errors

​Validation notes

​Task failure codes

​Related links

Overview

Endpoint and authentication

Copy-paste async quickstart

Poll for result

Request body

Text-to-video

Image-to-video with an image URL

Image-to-video from a Grok Image task

Parameters

Response format

Submit task response

Status response fields

Webhook callback mode

Billing

Latency and polling

Errors and troubleshooting

HTTP errors

Validation notes

Task failure codes

Related links