Grok Imagine 1.0 Video Extend - Unifically

Continue any video by URL using xAI’s classic Grok Imagine video model (the 1.0 generation, the only model xAI runs on its extension endpoint). Provide the public URL of the clip, describe what happens next, and choose how many seconds of new video to add. Output is capped at 720p.

This model takes a video_url and works on any video, including output from Grok Imagine 1.5 Video and Grok Imagine 1.5 Lite Video. Grok Imagine 1.5 Fast Video Extend (xai/grok-imagine-1.5-fast-video-extend) takes a task_id instead, only accepts tasks from xai/grok-imagine-1.5-fast-video, and continues them on the 1.5 engine.

Model

xai/grok-imagine-1.0-video-extend

Pricing

Current prices for this model are on the pricing page; the playground also quotes the exact price of a request before you submit it.

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	—	What happens in the new seconds
`video_url`	string	Yes	—	Public URL of the clip to continue
`duration`	int	No	`6`	Seconds of new video to add, `2`–`10`

Unknown request fields are rejected rather than ignored.

Example Request

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "xai/grok-imagine-1.0-video-extend",
    "input": {
      "prompt": "The camera keeps panning right to reveal a mountain range",
      "video_url": "https://example.com/source-clip.mp4",
      "duration": 6
    }
  }'

Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "processing"
  }
}

Volume discounts are available for almost all models. Reach out at contact@unifically.com to discuss custom pricing.