videostringrequired
URL of the source video to extend. Must be MP4 format (H.264, H.265, or AV1 codec), 2-15 seconds long.
Grok Imagine Video Extend
xai/grok-imagine-video/video-extendGrok Imagine Video Extend is xAI's video-to-video AI model. Transform, enhance, and edit video content using text prompts - from style changes to object manipulation and scene modification.
Try the model
Playground
Input
Text description of what should happen next in the video.
URL of the source video to extend. Must be MP4 format (H.264, H.265, or AV1 codec), 2-15 seconds long.
Additional Settings More
Customize your input with more control.
210
Length of the extension in seconds. Range: 2 to 10.
ResultExample
What would you like to do next?
Examples
Select an example to load its inputs and result into the playground.
- Open result ↗
Input
{ "prompt": "The camera slowly zooms out to reveal the city skyline at sunset", "video": "https://static.sandbase.ai/examples/79b3c8a1-2494-4e33-a23c-0538c9b1e3b0/input/04b0e73a-3edd-452f-ba14-e335fd7c1c88.mp4" }
Grok Imagine Video Extend
Grok Imagine Video extend: continue a clip with 2–10 seconds of new footage.
Fields
| Field | Type | Default | Notes |
|---|---|---|---|
prompt | string, required | — | Up to 4,096 characters. |
video | video URL, required | — | Source clip. |
duration | integer 2–10 | 6 | Output length in seconds. |
Billing
$0.06 per new second.
| Output | Price |
|---|---|
| 2s | $0.12 |
| 6s (default) | $0.36 |
| 10s | $0.60 |
Failed runs are not charged.
Prompting
- Describe subject, action, camera, and sound.
Also on SandBase
Other Grok Imagine Video endpoints: xai/grok-imagine-video/text-to-video, xai/grok-imagine-video/image-to-video, xai/grok-imagine-video/reference-to-video, xai/grok-imagine-video/video-edit, xai/grok-imagine-video/1.5/text-to-video (1.5, newer).
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "xai/grok-imagine-video/video-extend",
"video": "https://static.sandbase.ai/examples/xai/grok-imagine-video/extend/input_video_0.mp4",
"prompt": "The camera slowly zooms out to reveal the city skyline at sunset",
"duration": 6
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
status=$(printf '%s' "$result" | jq -r .status)
case "$status" in completed|failed|timeout) break ;; esac
sleep 2
result=$(curl --fail-with-body --silent \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
"https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"2. Authentication
Create a SandBase API key and set it in your server environment. All requests use Bearer authentication.
export SANDBASE_API_KEY="YOUR_API_KEY"Keep the key on your server. Do not expose it in browser code or commit it to a repository.
3. Queue
Submit a request
POST to /v1/run with this model ID and its inputs. The request example above includes submission and polling.
Fetch request status and result
Use the returned run ID to poll until the status is completed, failed or timeout. Read output only after completed.
curl "https://api.sandbase.ai/v1/run/$RUN_ID" \
-H "Authorization: Bearer $SANDBASE_API_KEY"4. Files
Hosted files
Pass a publicly accessible file URL in the model’s image, video or audio field. Supported formats and limits are shown beside each Playground input.
Uploading images
Use the upload or replace control on supported image fields in the Playground. Video URL fields accept a hosted driving video; they do not imply video-upload support.
5. Schema
Input
promptstringrequired
Text description of what should happen next in the video.
durationinteger
Length of the extension in seconds.
Default: 6
Minimum: 2
Maximum: 10
{
"model": "xai/grok-imagine-video/video-extend",
"video": "https://static.sandbase.ai/examples/xai/grok-imagine-video/extend/input_video_0.mp4",
"prompt": "The camera slowly zooms out to reveal the city skyline at sunset",
"duration": 6
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
[
{
"poster": "https://static.sandbase.ai/examples/posters/bc423fff483b508ccb4e.jpg",
"source": "xAI schema mirror",
"source_url": "https://docs.x.ai/",
"url": "https://static.sandbase.ai/examples/79b3c8a1-2494-4e33-a23c-0538c9b1e3b0/output/ec081a30-39f0-4977-a7ce-e85bbdcc6666.mp4"
}
]