Kling 3.0 vs Kling 4.0: What changed and which should you use?

Kuaishou announced Kling 4.0 in late September 2026, with a wider rollout planned for October. The headline upgrade is clip length. Kling 4.0 generates single clips of up to 30 seconds, double the 15-second ceiling of Kling 3.0. It also adds up to 10 keyframes for steering a shot as it unfolds. A lighter Kling 4.0 Flash opened to early-access users on September 28.

Kling 4.0 is not generally available yet, so the Kling 4.0 numbers in this article are Kuaishou’s announced specs, not independent test results. We run Kling 3.0 in production on Scenema, so the Kling 3.0 side of the comparison comes from daily use.

What is Kling 4.0?

Kling 4.0 is the fourth generation of Kling, the AI video model family built by Kuaishou. Kuaishou announced it in late September 2026, nearly eight months after Kling 3.0 launched on February 5, 2026.

The release comes in two tiers:

• Kling 4.0: The full model, scheduled for October.
• Kling 4.0 Flash: A faster, lower-resolution version that Kuaishou opened to Ultra Yearly subscribers on September 28.

Kuaishou has not published pricing for either tier, and it has not confirmed when developer access through its application programming interface (API) will open.

What changed between Kling 3.0 and Kling 4.0?

Kling 4.0 keeps the core of Kling 3.0: text-to-video, image-to-video, native audio generated with the picture, and reference inputs for keeping characters consistent. The upgrades are in how long a clip can run and how much control you get over it.

Two further features appear in Kuaishou’s announcement as “coming soon” rather than part of the October launch. The first is 10-bit high dynamic range (HDR) output at 1080p and 4K. The second is clip extension up to 2 minutes. Treat both as roadmap items until they ship.

What is Kling 4.0 Flash?

Kling 4.0 Flash is the fast tier of Kling 4.0. It generates clips of up to 20 seconds at up to 720p in standard dynamic range (SDR), the ordinary brightness and color range most video uses. HDR, by contrast, shows brighter highlights and deeper shadows. Kuaishou opened Flash on September 28 to Ultra Yearly subscribers only and has not published Flash pricing.

Flash is useful for drafting. A 720p pass is enough to check framing and camera movement before committing to a full-resolution render. It is not the model to judge Kling 4.0’s final image quality by, since the full model’s 4K output and 30-second clips are not part of the Flash spec.

Should you use Kling 3.0 or Kling 4.0?

Assuming Kling 4.0 delivers what Kuaishou has announced, the choice comes down to the shot you are making.

If you have early access to Kling 4.0 Flash, use it for drafts. Rough out the shot at 720p, then render the final take on whichever full model fits.

Does a 30-second clip matter for long-form AI video?

A 30-second clip matters less for long-form video than the headline suggests. A long-form video is not one long clip. It is dozens or hundreds of short shots assembled in sequence, the same way a film is edited. Doubling the length of a single clip helps with individual long takes, but it does not by itself produce a 5-minute or 20-minute video.

What matters more for long-form work is keeping characters and products consistent from one shot to the next. That is where Kling 4.0’s larger reference budget and keyframe control could help most, if they perform as announced. For the full picture on video length limits, see what is the longest AI video you can make.

How does Scenema use Kling?

Kling 3.0 is one of the video models in Scenema’s long-form pipeline. Scenema plans the shot list and picks the best model for each shot based on the style and the task, while users choose the quality and resolution. The shots are then assembled into scenes and full videos, with character consistency and narration carried across every cut.

We will update this article once we have tested the full Kling 4.0 release.

The TL;DR on Kling 3.0 vs Kling 4.0

When is Kling 4.0 released? Kuaishou announced Kling 4.0 in late September 2026, with a wider rollout planned for October 2026. Kling 4.0 Flash opened to Ultra Yearly subscribers on September 28.

How long can Kling 4.0 videos be? Kling 4.0 generates single clips of 3 to 30 seconds. Kling 4.0 Flash generates clips of up to 20 seconds. Kling 3.0 tops out at 15 seconds.

What is the biggest difference between Kling 3.0 and Kling 4.0? Kling 4.0 gives you longer clips and more control. It doubles the maximum clip length and adds up to 10 keyframes, where Kling 3.0 offers only start and end frames, plus per-shot prompts in multi-shot mode.

Is Kling 4.0 Flash the same as Kling 4.0? Kling 4.0 Flash is a separate, faster tier limited to 720p and 20-second clips. The full Kling 4.0 model supports 4K and 30-second clips.

Should I wait for Kling 4.0? Only if your project depends on continuous takes longer than 15 seconds or on keyframe control. For most shots, Kling 3.0 is available today and already produces video of up to 4K with native audio.

Where to go next

• See the Kling 3.0 model page for how Scenema runs Kling 3.0 inside long-form video.
• Read what is the longest AI video you can make for how clip limits relate to full-length video.
• Read how to keep character consistency in AI video for the techniques behind consistent characters across shots.
• Try Scenema at scenema.ai.