Grok Imagine Video Extend
Generated on PixelDojo with Grok Imagine Video Extend. Produced by PixelDojo's generation pipeline.
Grok Imagine Video Extend costs 2 credits for every second of new footage it generates, so a 6 second extension, the default, costs 12 credits. This page is built from the tool's own pricing and duration rules rather than a fresh timed run, because the cost here is a flat formula rather than something that varies by scene. It covers exactly what that formula charges, what durations it accepts, and when Grok R2V is the tool you actually want instead.
How the extension price actually works
The formula is 2 credits per second, rounded up
Extension duration is clamped to 2 to 10 seconds, then multiplied by 2. Everything below is that formula worked out at every allowed length.
The price table
2s: 4 credits. 3s: 6. 4s: 8. 5s: 10. 6s (default): 12. 7s: 14. 8s: 16. 9s: 18. 10s (max): 20.
It continues a clip, it does not create one
The required input is an existing MP4, 2 to 15 seconds long, plus a prompt describing what should happen after the last frame. There is no text-to-video or image-to-video mode on this endpoint.
The price does not depend on the source clip
Only the extension_duration you request is billed. A 15 second source video costs the same to extend as a 2 second one, for the same extension length.
No resolution or aspect ratio setting
Unlike most of the video catalog, this tool has no resolution or aspect ratio field to tune. It inherits whatever the source clip already is.
Canvas-ready
It is wired into Canvas as a video-edit step, so an existing clip generated earlier in a Canvas session can be extended in place with a typed prompt.
Why Choose Pixel Dojo for Grok Imagine Video Extend
Professional-quality results with cutting-edge AI technology
A flat, predictable formula
2 credits per second of new footage. No resolution tier, no per-scene variance to account for.
Works on footage from any source
The only requirement is an MP4 between 2 and 15 seconds. It does not have to be a PixelDojo generation.
Extension length is independent of source length
A 2 second clip and a 15 second clip extend for the same price at the same requested duration.
How It Works
How a request is built, read from the tool's own schema:
Point it at an existing MP4
video_url must resolve to a real file, and video_duration must state its real length, 2 to 15 seconds.
Describe what happens after the last frame
The prompt is written as a continuation instruction, for example camera pans across the city at night, not a full scene description.
Set extension_duration to control length and price together
2 to 10 seconds, 2 credits per second. The default is 6 seconds for 12 credits if you leave it unset.
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Common Questions
Everything you need to know about Grok Imagine Video Extend
What does Grok Imagine Video Extend cost?
2 credits per second of new footage, rounded up, with extensions of 2 to 10 seconds. The default 6 second extension costs 12 credits, and the maximum 10 second extension costs 20.
Does the source clip length change the price?
No. Price is based only on extension_duration, the amount of new footage you are asking for. Your source video can be anywhere from 2 to 15 seconds.
How do I call it from the API?
POST to /api/v1/models/grok-video-extend/run with your API key, a video_url pointing at an existing MP4, video_duration matching that clip's real length, a prompt describing what happens next, and extension_duration to set both the new footage length and the price.
How is this different from Grok R2V?
Grok R2V generates a new clip from 1 to 7 reference images and a prompt, priced at 2 credits per second of output for a 1 to 10 second clip. Video Extend does not generate from scratch. It requires an existing MP4 and only adds footage after the last frame.
Can I extend a clip more than once?
The endpoint takes one source video per request. Extending a clip twice means running it again with the newly extended file as the next video_url.