Grok Imagine Video Length Limit: 15 Seconds, and How to Go Longer (2026)

A single Grok Imagine video can be up to 15 seconds long, as of November 1, 2026. xAI's API lets you pick any whole-second length from 1 to 15 seconds, while the Grok app gives you a few preset lengths. To go past 15 seconds you extend the clip: each extension adds 2–10 seconds to a source video of 2–15 seconds, so one extension can take you to about 25 seconds, and chaining extensions or stitching clips gets you further.

This guide covers the exact limits from xAI's documentation, what changes between the app and the API, why the Extend button sometimes disappears, and how to make longer videos, in Grok or with the longer-clip models on Kenerate AI.

How long can a Grok Imagine video be?

The headline number is 15 seconds per generation. xAI's video generation docs list a configurable duration of 1 to 15 seconds, defaulting to 8 seconds, for its current video model, grok-imagine-video-1.5. Reference-to-video, where you guide the clip with your own images, is capped lower, at 10 seconds on the original grok-imagine-video model.

Here is the full picture from xAI's developer docs (checked November 1, 2026):

Two details people miss:

• Extend sets the added seconds, not the total. xAI's own example: a 10-second video extended by 5 seconds returns a 15-second video.
• Edits don't make anything longer. Editing a clip keeps its original length and stops at 8.7 seconds, so it is not a way to get extra time.

Is the Grok app limit the same as the API?

Mostly, but the app is simpler. Instead of a slider from 1 to 15 seconds, the Grok composer offers a few preset lengths, and third-party guides from 2026 describe options of 6, 10 and 15 seconds. Elser AI's August 2026 review of xAI's pages notes that the consumer Grok page advertises text-to-video "up to 15 seconds" at up to 720p, while the API's Grok Imagine Video 1.5 reaches 1080p.

So if you only see 720p in the app, that's expected: 1080p is an API feature.

How long were Grok videos before?

The first versions of Grok Imagine made 6-second clips, and later a 10-second option. That's why older articles and Reddit threads still say "Grok videos are 6 seconds" or "10 seconds max". The 15-second ceiling came with Grok Imagine 1.5. If a guide quotes a shorter limit, check its date.

Is there a daily limit on Grok videos?

Yes, but xAI doesn't publish a fixed number. Its FAQ describes a shared usage pool for paid plans that moves with server load. Reports from early 2026 say free accounts lost video generation entirely, so video now needs X Premium, Premium+ or a SuperGrok plan. We explain the plans in Is Grok Imagine free?.

Because third-party "X videos per day" figures disagree widely, we don't repeat them here. Treat any exact daily number as unverified unless it comes from your own account screen.

How do you make a Grok video longer than 15 seconds?

You have three options. They differ in how smooth the result is and in how much you control.

Option 1: Use Extend in Grok

1. Generate a clip and open it in Grok Imagine.
2. Choose Extend (it continues the video from its last frame).
3. Write a short continuation prompt: what happens next, the same subject, the same camera style.
4. Pick the added length (2–10 seconds through the API; the app offers presets).
5. Repeat on the new clip if you need more. Each extension returns a new video you can extend again.

Some 2026 guides report that the app caps the total at 30 seconds of extended video. xAI's docs don't state a total limit, but they do require the source clip to be 15 seconds or shorter. In practice that means one extension from a full 15-second clip, or several shorter steps that stay under 15 seconds before the last one.

Option 2: Chain clips from the last frame

If Extend isn't available, take a screenshot of the final frame, use it as the start image for a new image-to-video generation, and join the clips in any editor. The cut won't be quite as smooth as a true extension, because the model doesn't see the motion leading up to that frame. Keep the prompt narrow ("same woman, same red jacket, keeps walking toward the camera") to reduce drift.

Option 3: Use a model that generates longer clips in one go

The cleanest fix is to start with a longer generation. Some video models now produce up to 30 seconds in a single pass, which means one continuous take with no seams.

Grok Imagine vs longer-clip video models

These are the video models on Kenerate that matter for clip length. Lengths and credit rates come from Kenerate's model config, as of November 1, 2026. Credit rates are at 720p.

Grok Imagine 1.5 on Kenerate supports 480p (24 credits/s), 720p (42) and 1080p (75), plus 3 credits for each input image. The older Grok Imagine model is a flat 15 credits per second, so a 10-second clip costs 150 credits. Read more on the Grok Imagine model page or try it in the Grok Imagine video generator.

What this means in practice:

• Need 20–30 seconds in one continuous shot? Wan 3.0 and Seedance 2.5 both generate up to 30 seconds at once. Wan 3.0 is the budget pick at 15 credits/s at 480p. Seedance 2.5 is the cinematic pick, with 4K output and multi-shot scenes.
• Love the Grok look but need more time? Generate with Grok Imagine (v1) and extend it, or make a 15-second Grok Imagine 1.5 clip and continue it with Video Extend on another model.
• Just testing an idea? Short 5–6 second drafts at 480p cost the least everywhere. Extend the one you like.

How do you extend a Grok video on Kenerate?

Kenerate's AI video extender runs the same "continue from the last frame" idea on several models, including Grok Imagine, Wan 3.0 and Seedance.

1. Open the video studio and choose Video Extend.
2. Upload your clip, or pick a video you already generated on Kenerate.
3. Choose a model. Grok Imagine adds 6 or 10 seconds and keeps the source at 720p. Wan 3.0 adds 2–30 seconds.
4. Describe what happens next. Keep the subject, outfit, setting and camera the same as the source.
5. Generate, check the join, then extend again or download.

Video generation on Kenerate runs on paid credit packs, which are one-time and don't expire. The free sign-up credits work on image models, so you can make a start frame first. The studio shows the exact credit cost before you generate.

Why did the Grok Extend button disappear?

Many people search "grok ai extend video disappeared", and xAI hasn't published an official explanation. Extension is still documented in xAI's API docs as of November 1, 2026, so the feature itself exists. Third-party troubleshooting guides point to a handful of likely causes:

• App version lag. The mobile app can trail grok.com by a release. Try the same clip on the web.
• The clip came from the wrong model or source. Extend runs on grok-imagine-video. Uploaded clips, or very old ones, may not show the option.
• The source is too long. The API rejects source videos longer than 15 seconds, so a clip that's already been extended past that can't be extended again.
• Plan or usage limits. If your plan's video pool is used up, generation buttons can disappear or stay disabled until it resets.

If none of these fix it, use Option 2 (chain from the last frame) or extend the clip with another model on a tool such as Kenerate's video extender.

Which Grok length should you pick?

Longer isn't always better. Every model is more likely to drift (faces, hands, clothing) late in a long clip. If a 15-second Grok clip loses consistency after 10 seconds, try a 10-second clip plus an extension: the extension starts again from a clean frame.

If you're comparing Grok with other tools for longer work, our Grok Imagine alternative page covers the options side by side.

Sources

• xAI Docs: Video generation (durations, resolutions, edit limits)
• xAI Docs: Video extension (source 2–15 s, adds 2–10 s, 720p)
• Elser AI: Grok AI video limits (review of xAI's consumer pages, Aug 2026)
• Vercel AI Gateway: Video extension (duration is the added segment)

Updated November 1, 2026. Grok's limits change often; check xAI's docs before you plan a long project.