Grok Imagine Video Extend
Generated on PixelDojo with Grok Imagine Video Extend. Produced by PixelDojo's generation pipeline.
Grok Imagine Video Extend costs 1.5 credits for every second of the finished clip, which is your source plus the new footage, rounded up to a whole second. Adding the 6 second default to a 5 second clip makes an 11 second output: 16.5 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 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 1.5 credits per output second, rounded up
The output is the source clip plus the extension. We measure your source on our side before charging, add the extension (2 to 10 seconds), round up to a whole second (the first tenth of a second past one is not counted, since real clips run a hair long) and multiply by 1.5.
The price table
On a 5 second source: 2s extension, 10.5 credits. 4s: 13.5. 6s (default): 16.5. 8s: 19.5. 10s (max): 22.5. Each extra second of source adds 1.5.
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 source clip counts toward the price
The provider bills the whole finished clip, so the price covers the source seconds as well as the new ones. A 2 second source extended by 6 seconds is 12 credits; a 14 second source extended by 6 is 30.
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 predictable formula
1.5 credits per second of the finished clip. No resolution tier, no per-scene variance to account for.
Works on footage from any source
The only requirement is a standard MP4 or MOV between 2 and 15 seconds. It does not have to be a PixelDojo generation.
Short sources extend cheapest
Because the source counts, trim to the part you need before extending: a 3 second source extended by 6 seconds is 13.5 credits, a 12 second one is 27.
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 MP4 or MOV, 2 to 15 seconds long. We read its length ourselves before charging.
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
2 to 10 seconds. The default is 6 seconds; on a 5 second clip that is an 11 second output, 16.5 credits.
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Common Questions
Everything you need to know about Grok Imagine Video Extend
What does Grok Imagine Video Extend cost?
1.5 credits per second of the finished clip, the source plus the new footage, rounded up to a whole second. Extensions run 2 to 10 seconds. Adding the default 6 seconds to a 5 second clip costs 16.5 credits, and the maximum 10 seconds on a 5 second clip costs 22.5.
Does the source clip length change the price?
Yes. The provider bills the whole output, so every second of source counts at 1.5 credits alongside the new footage. We measure the source ourselves before charging, and it 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, a prompt describing what happens next, and extension_duration to set the new footage length. You do not send the source length: we measure the clip before charging, and a clip we cannot read is refused without a charge.
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.