xAIFastHigh

Grok Imagine Video

Generate videos with xAI's Grok Imagine Video model over the direct xAI API. Text-to-video and image-to-video with synchronized audio. For editing an existing clip, use xai/grok-imagine-video/edit.

1300 credits

per 8s video (default) — billed per second (480p 116/s, 720p 163/s)

Text-to-video and image-to-video generation

Synchronized audio track included

480p or 720p output, 1-15 seconds

Per-second billing differentiated by resolution

Run it right now

Test this model instantly in the Console Playground — no code required

Use with AI Assistant

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llms.txtllms.txt ↗

Quick Start

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "xai/grok-imagine-video",
  "input": {
    "prompt": "a penguin walks away from the camera, towards a large snowy mountaintop in the distance",
    "duration": 8,
    "resolution": "720p",
    "aspect_ratio": "16:9"
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	Text prompt for video generation
`image`	string	No	-	Input image to generate video from (image-to-video). Supports jpg, jpeg, png, webp
`duration`	integer	No	8	Duration of the video in seconds (1-15)
`resolution`	string	No	-	Resolution of the video. When omitted, billing uses the 720p rate — set it explicitly 480p720p
`aspect_ratio`	string	No	16:9	Aspect ratio of the output video ('auto' is not accepted by the direct xAI API) 16:94:31:19:163:43:22:3

How to Provide File Input

There are 3 ways to provide files for the image parameter:

Recommended

Image URL

Pass a publicly accessible URL directly. With the Storage API (POST /v1/files/upload-url) the file uploads straight to S3 (50MB per file) and you pass the returned file_url.

{
  "model": "xai/grok-imagine-video",
  "input": {
    "prompt": "your prompt here",
    "image": "https://example.com/image.jpg"
  }
}

Direct Upload (Multipart)

Attach files directly to POST /v1/predictions/upload. No separate upload step, but the bytes pass through the API server so the whole request is capped at 10MB.

curl -X POST "https://api.core.today/v1/predictions/upload" \
  -H "X-API-Key: cdt_your_api_key" \
  -F "model=xai/grok-imagine-video" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:image=@your_file.png"

See the File Upload docs for more upload methods including Presigned URLs.

Common Parameters

Common parameters used when calling POST /v1/predictions.

Parameter	Type	Required	Default	Description
`model`	string	Yes	-	Model identifier
`input`	object	Yes	-	Object containing the model-specific parameters from the table above
`output_folder`	string	No	-	Folder path for output files (max 256 chars, '..' not allowed)
`webhook_url`	string	No	-	Webhook URL to call on completion
`is_public`	boolean	No	false	If true, output files are also available via permanent public URLs

Examples

Text-to-Video (720p)

Generate an 8-second clip directly from a text prompt

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "xai/grok-imagine-video",
  "input": {
    "prompt": "a penguin walks away from the camera, towards a large snowy mountaintop in the distance",
    "duration": 8,
    "resolution": "720p",
    "aspect_ratio": "16:9"
  }
}'

Budget Clip (480p)

480p costs ~28% less per second than 720p

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "xai/grok-imagine-video",
  "input": {
    "prompt": "a lone astronaut walking across a red Martian desert as twin suns set on the horizon",
    "duration": 15,
    "resolution": "480p",
    "aspect_ratio": "16:9"
  }
}'