Grok Imagine Extend: continue the keeper, do not roll a new identity (2s, 3s, 4s, 8cr)
Use Grok Imagine Extend only when the last frame is already a keeper. Extension spends on more seconds, not on a different idea.
Use Grok Imagine Extend only when the last frame is already a keeper. Extension spends on more seconds, not on a different idea.
The catalog description is the contract: continue an existing Grok Imagine video at a chosen timestamp, 6 or 10 seconds. The duration list on the card is 2s through 10s. Credits: 8. Category: extend-video. Catalog audio is false. It does not require an image because the source is a prior Imagine take, not a jpg you uploaded.
If the last frame is a stranger, extending it is how you pay 8 credits to meet that stranger for longer.
More seconds, same person
Grok Imagine Extend is not a recast. It is not image-to-video. It is not "try a different vibe from frame twelve." The prompt is continuation guidance: what happens next from the timestamp you picked. Match subject, eyeline, light. Describe the next beat as if finishing a sentence.
The extend a video agent job is this family. The video-extend glossary is the name. Grok's roster also holds Grok Imagine Video — 6s / 10s / 15s / 20s / 30s, 720p, native audio, 7 credits — which is how you start a clip. Start and extend are different rows. Rolling a new Imagine generate because the extend felt small is how identity splits at the seam.
External files do not belong here. This endpoint continues Imagine output from your own prior task. A Veo download, a phone clip, a competitor export: wrong door. Generate in Imagine first, approve the last frame, then extend.
6 or 10 seconds from a timestamp
The product copy names 6 or 10 seconds of new footage from a chosen point. The card also lists 2s–10s as supported durations. Either way you are buying a short continuation, not a second film. 2s, 3s, and 4s are in the enum if you only need a button-off; they are not a reason to extend a take you already dislike.
Pick extend_at (or the timestamp control in the UI) on purpose. Branching from 0s is a different idea than branching from the last good frame. Extending through a blink or a morph just elongates the defect.
Audio is false on this row. Do not prompt a new spoken line and expect a score. If the original Imagine clip had native audio, treat the join as picture-first and finish sound in video editing if the bed falls off.
The keeper test
Look at the last frame at 100%.
- Face, hands, label: still the brief? Extend.
- Face drifted, extra fingers, logo melted? Do not extend. Generate a new Imagine clip, or recut.
Extension cannot vote down a bad identity. It can only continue one. The best video extender list is full of rows that do this job on other families; Grok's rule is in-family. Stay on Imagine if Imagine is why the clip looks like itself.
Eight credits buy more seconds of the keeper. They do not buy a different idea.
FAQ
Can I extend a clip I generated on another model?
Not on this row. Grok Imagine Extend continues an existing Grok Imagine video. Other families have their own extend cards. Sending a foreign file here is how you get a reject, not a join.
Why list 2s, 3s, and 4s if the description says 6 or 10?
The catalog duration array is 2s through 10s; the description names 6 or 10 second continuations from a timestamp. Use the control in front of you, and size the next beat to that window. Do not write a 20-second action into a 6-second extend.
Does extend rewrite the soundtrack?
Catalog audio is false. Prompt the picture continuation. If the original bed needs to keep going, plan a sound pass after the join rather than asking this row to compose.
When should I generate a new Imagine clip instead of extending?
When the last frame is not a keeper — identity, blocking, or product wrong. Extension spends on more seconds of whatever you already have.