Grok Imagine Video Extension

Extend an existing video with xAI’s Grok Imagine Video model by describing what happens next.

Model Overview

Grok Imagine Video Extension takes a source video and generates a continuation from its final frame. The output is returned as one stitched clip that contains the original footage plus the generated extension.

Best At

• Continuing an existing clip with a prompt-directed next action.
• Building longer sequences from shorter Grok video shots.
• Iterative extension workflows where each pass picks up from the last frame.

Limitations / Not Good At

• This node is for continuation, not full text-to-video or reference-image generation.
• The source video must already be a valid short MP4 clip.
• Because the output is returned as a stitched full clip, longer source footage makes the final billed output duration larger.

Ideal Use Cases

• Extending a generated Grok clip with an extra beat or camera move.
• Lengthening short source videos without changing their overall look.
• Prompt-directed narrative continuation from an existing shot.

Input & Output Format

• Input: required prompt and video; optional duration for the added continuation.
• Output: stitched extended video returned on response.

Performance Notes

• Replicate bills this model per second of output video.
• Nodespell estimates from the requested extension length and, when available, the source clip duration so the preview is closer to the stitched final output length.