Kling 4.0: 30-Second AI Videos With 10 Keyframes and Stereo Sound

Kling 4.0 changes AI video in one simple way: it gives you more control. Instead of typing a prompt and hoping the clip turns out the way you pictured it, Kuaishou's latest Kling AI model lets you shape the shot, lock the look of a character or product, and keep a scene going for a full 30 seconds in a single take. The model was officially announced on September 28, 2026, under the tagline "You call the shots," and it became fully available to all users on October 15, 2026. That tagline is not just marketing. It describes what is actually different here.

For most people, AI video has always felt like a lottery. You write a good prompt and get a good clip — sometimes. Change one word and the character's face changes, the lighting shifts, or the camera jumps in a way you never asked for. Kling 4.0 is built to fix that frustration, and the features below are how it  tries.

Credit: Kling AI — AI video clips collage, via Eway-CRM

Thirty seconds changes everything

The headline upgrade is length. Kling 4.0 can generate native single-pass clips of up to 30 seconds, double the 15-second ceiling of Kling 3.0. Fifteen seconds is enough for a quick social clip, but not for a real scene. A character cannot walk into a room, have a moment, and leave again in 15 seconds without the video feeling rushed.

Thirty seconds gives a scene room to breathe. A product shot can start wide, move in close, and end on a detail. A short story beat can actually play out instead of being squeezed into a teaser. It also means the model must hold a scene together for twice as long — keeping faces, objects, and lighting consistent — which is a much harder problem than generating a five-second burst.

Ten keyframes: directing, not just prompting

The second big upgrade is keyframes. Kling 4.0 supports up to 10 keyframes per generation, and this is where "you call the shots" becomes real. A keyframe is a moment you define: what the shot looks like at that point in the video. With up to 10 of them, you can plan actions, scene changes, and camera rhythm across a clip instead of describing everything in one block of text and hoping the model guesses your intent.

For professional creators, this is the feature that matters most. A brand cannot ship an ad where the product changes colour halfway through. A filmmaker cannot use a clip where the camera suddenly jumps. Keyframes do not guarantee perfection, but they turn AI video from a slot machine into a tool you can actually direct.

Omni Reference: keeping characters and products consistent

The third upgrade is Omni Reference, and it solves the most annoying problem in AI video: consistency. Kling 4.0 accepts up to 15 combined reference inputs — images, video, voice, and subjects — so you can lock a character, a product, and a lighting style across shots.

Here is why that matters. Suppose you are making a series of ads for the same product. In older models, each new clip was a fresh roll of the dice: the product might look slightly different, the lighting might shift, the background might change. With Omni Reference, you feed the model your references and it has something concrete to hold on to. The same face stays the same face. The same product stays the same product.

Sound that actually matches the picture

Credit: Kling AI logo, via Lockerz

Video without good sound feels unfinished, and Kling 4.0 takes audio seriously. The model generates native two-channel stereo audio, with tighter lip-sync than earlier versions. Dialogue and sound arrive as part of the same generation, not bolted on afterwards, and the audio is in stereo rather than flat mono.

Built for agents, and what it costs

Kling 4.0 also comes with agent access. MCP and CLI support have been reported, along with a timeline and canvas on the creation page. In plain terms, developers and automated workflows can drive the model programmatically, not just through a web page, and creators get a visual workspace to plan their shots. As AI video moves from a browser novelty into real production pipelines, that matters: studios want to script the work and plug output into existing tools.

Pricing needs a careful read. The figures here are reported pricing from independent analyses, not an official Kling rate card, so treat them as a guide. Reported pricing puts Kling 4.0 at 15 credits per second at 1080p and 10 credits per second at 720p — 450 credits for a 30-second clip at 1080p. One tester estimated that at roughly 16 yuan before re-rolls, but your actual cost depends on how many attempts you need. If you regenerate a clip three times, you pay three times, so budget for more than one generation per finished clip.

The API question: what is confirmed, and what is not

This is where the story needs care. A press release from SelfyzAI, distributed via EINPresswire, says the Kling 4.0 API service officially launched on October 22, 2026, and was gradually opening to enterprise customers and developers worldwide, with SelfyzAI among the first to integrate it. That is what SelfyzAI says.

However, independent trackers writing just days earlier described the official developer API as "coming soon." An October 15 analysis listed the developer API as coming soon, an October 19 report said Kling's developer platform headline read "Kling 4.0 API Coming Soon," and an October 18 note said Kling's own developer site listed it as coming soon and that its prepaid API packages did not yet support Kling 4.0. No official announcement from Kling or Kuaishou confirming an October 22 API launch was found.

Credit: Kling 3.0 promotional graphic for illustration — NOT a Kling 4.0 screenshot, via Ezart

So the honest picture is this: the model itself is real and available, but the October 22 API launch should be treated as SelfyzAI's claim, not as an established fact, until Kling or Kuaishou confirms it directly.

Who should care about Kling 4.0

Kling 4.0 is not for everyone. If you only need a quick, fun clip for social media, older and simpler tools will do the job. But if you make content where consistency, control, and length matter — ads, product videos, short films, recurring characters, brand campaigns — this release is worth a serious look. The combination of 30-second clips, 10 keyframes, and 15 reference inputs addresses the three complaints creators have had about AI video since the beginning: too short, too random, and too inconsistent.

The model is not perfect. Pricing is reported rather than officially published in full, some promised features have not shipped, and the API picture is murky. But the direction is clear: AI video is moving from "type a prompt and hope" to "direct the shot and keep it consistent." Kling 4.0 is one of the strongest steps in that direction so far.

Key Takeaways

• Kling 4.0, announced September 28, 2026, generates native clips up to 30 seconds — double Kling 3.0's 15-second limit — with full availability from October 15, 2026.
• Up to 10 keyframes per generation let creators plan actions, scene changes, and camera rhythm instead of relying on a single prompt.
• Omni Reference accepts up to 15 combined inputs (images, video, voice, subjects) to keep characters, products, and lighting consistent across shots.
• Native two-channel stereo audio with tighter lip-sync arrives as part of the generation, not as an afterthought.
• Reported pricing is 15 credits per second at 1080p and 10 credits per second at 720p — reported, not an official rate card.
• The October 22 API launch is SelfyzAI's claim only; independent trackers had the official API as "coming soon" days earlier, and no official Kling confirmation was found.

The bottom line is simple: Kling 4.0 gives creators the controls they have been asking for. Longer clips, real shot planning, and consistency across scenes make it a serious tool rather than a toy. Just check the API situation and the pricing for yourself before you build a project around it — and then go and direct something.

Sources: Kling 4.0 release analysis — kie.ai; Kling 4.0 pricing — wireflow.ai; SelfyzAI among first to integrate Kling 4.0 API — EINPresswire press release.