Kuaishou's Kling 4.0 is rolling out this month, doubling the length of a single AI-generated clip to 30 seconds. It also adds 4K output and the ability to lock down how a subject looks across a whole shot.
Kling 4.0 launches with 30-second clips and 4K output
Kuaishou's Kling AI has set October 2026 for the full launch of Kling 4.0, its next video generation model. The headline change is length. Where Kling 3.0 from February topped out at 15 seconds per generation, Kling 4.0 doubles that to as much as 30 seconds in a single pass.
A faster version, Kling 4.0 Flash, has been in limited early access since September 28 for Kling's highest tier of annual members. The full model is the one arriving this month, and Kling has already published a large batch of sample clips to demonstrate it. All the specs and capability claims here come from Kling's release notes and sample footage, so treat the quality claims as the vendor's own until independent testing catches up.
For anyone making short-form video with AI, the jump from 15 to 30 seconds is the difference between a clip and a scene. Longer unbroken takes mean fewer seams to hide, less stitching in an editor, and more room for a shot to actually develop.
What Kling 4.0 can generate
Resolution now reaches 4K, on top of 720p and 1080p, and Kling lists 10-bit HDR at 1080p and 4K, with HDR flagged as still coming soon. Audio arrives as two-channel stereo, and the older models' lip-sync carries forward.
The controls around a generation have grown too. Kling 4.0 accepts up to 10 keyframe images, so you can sketch how a shot should unfold rather than describe it in words alone. Omni Reference pulls as many as 15 references into one request, spread across images, videos, voice, and reusable elements, with a cap of 10 images and 5 video clips. That's the feature that keeps a character or product looking the same from shot to shot, which is where AI video usually falls apart.
Text prompts get more room as well, up to 8,000 tokens. The model handles prompts and on-screen text in Chinese, English, Japanese, Korean, Spanish, Portuguese, German, and French. Video editing takes up to 5 input clips. Kling also supports video continuation, letting you chain generations toward roughly two minutes of continuous footage.
Kling 4.0 core upgrades
- Single generation up to 30 seconds
- 720p, 1080p and 4K output
- Up to 10 keyframe images per task
- Up to 15 multimodal references
- Stereo audio with lip sync
- Chained continuation toward 2 minutes
Still limited or coming
- 10-bit HDR flagged as coming soon
- Reference video capped at 5 clips
- Total reference video time of 30 seconds
- Quality claims not yet independently verified
- Flash tier still in early access
Why the 30-second Kling 4.0 clip matters
Length is the constraint that shaped AI video for most of its short life. A model that generates 5 or 10 seconds forces creators to build a scene from fragments and cover the cuts with fast editing. At 30 seconds, a single prompt can carry a full beat of a story. That's a real change.
What Kling is really selling with that extra time is narrative completeness. A longer take has to hold together on its own: motion that doesn't drift, lighting that stays consistent, and a subject that doesn't morph halfway through. Kling says it improved motion stability and visual realism, which are exactly the problems that show up when a clip runs long. If the improvements hold, the 30-second window is the payoff. If they don't, the extra seconds just expose the flaws longer.
The reference tools address the other classic failure. Keeping a character's face, or a product's look, steady across shots has been the hardest part of AI video. Ten keyframes and 15 references are Kling's answer: give the model more to anchor on, and it stays on model.
There's a practical payoff here for anyone doing ad work or a short series. Consistent character and product shots are what make a set of clips read as one piece rather than a pile of unrelated generations, and that's the bar professional work has to clear.
Which Kling 4.0 plan gets you what
Access tracks Kling's membership tiers. Kling 4.0 Flash went first, on September 28, to a limited group of users through early access, described as Kling's highest annual tier. The full Kling 4.0 is the model arriving this month for the general user base. Kling hasn't published a finished day, only the month.
That staged pattern matters if you're planning to use it soon. Flash is the faster, lighter option for quick iterations. The full model is the one with the 30-second clip and the widest reference controls. If your work leans on long takes and consistent characters, you want the full model, and you want to check whether your tier reaches it before you build a workflow around it.
Kling 4.0 is also coming to partner platforms that already serve earlier Kling models through a single API. That route matters for anyone building video features into an app, since it avoids juggling separate accounts and keys.
Kling's business backdrop and Hong Kong listing
Kling isn't a standalone bet. Its parent, Kuaishou, raised $2.8 billion for the Kling business in July, with Alibaba, Baidu, and others among the investors, and the company is working toward a Hong Kong listing. A flagship video model launch is the kind of story that travels well ahead of a public offering.
That context explains the timing and the polish. Video generation is one of the few AI markets with clear consumer demand and clear willingness to pay, and Kling is one of a handful of models competing at the top. Doubling clip length in one release is a visible way to stay in that conversation, and a fresh flagship gives a listing story something concrete to point at.
It also raises the stakes on the marketing-versus-reality gap. Launch clips are hand-picked. Real users will feed Kling 4.0 messy prompts and awkward subjects, and the model's reputation will be built there, not in the polished reel.
So is the 30-second clip real? That depends on how the motion and reference controls hold up outside the demo.
How to try Kling 4.0
Kling 4.0 is arriving this month as the full release reaches users, with Flash having led the way since late September. Access runs through Kling's own platform and through partner APIs that already serve Kling O3 and Kling 3.0.
If longer takes are what you've been waiting for, this is the release to test. Start with a 30-second prompt that has a clear subject and a simple action, then push the keyframe and reference controls to see whether a character holds together across the full clip. That first experiment will tell you more about Kling 4.0 than any sample reel. Check your tier too, since the full model and Flash don't land at the same time.
