Kling 4.0 Is Live: 30-Second AI Video, 10 Keyframes, and What It Actually Costs

Kling 4.0 is live. Kuaishou's AI video platform opened its new flagship model to all users on October 16, 2026 — the company announced the global launch from Beijing — and the headline spec is the one every video creator has been waiting for: a single generation can now run 30 seconds without a cut. That's a full scene — setup, camera move, payoff — instead of a five-second clip you have to stitch together later.

Here's what actually changed, what it costs, and what's still behind a "coming soon" label.

Quick answer

Kling 4.0 is Kuaishou's new flagship AI video model, available now on the Kling AI website. It generates up to 30 seconds of video per shot, supports up to 10 keyframes and 15 reference assets per generation, and accepts prompts up to 8,000 tokens. One unusual fact: Kling publishes no per-generation credit prices publicly — launch-week reviewers observed 450 credits for a 30-second 1080p take and 120 credits for a 20-second Flash take at 720p, but those are reviewer observations, not an official price list. 10-bit HDR, 4K output and the developer API are marked as coming soon. (Last verified: October 21, 2026.)

What actually changed: three upgrades that matter

1. Native 30-second generation

Previous Kling versions topped out around 5–15 seconds per generation. Kling 4.0 pushes that to 30 seconds in one take, and adds a 21:9 ultrawide frame alongside 16:9, 9:16 and 1:1. The point isn't the number itself — it's what a 30-second shot lets you do. A tracking shot can now enter, move through, and resolve a scene without a hard cut. Dialogue exchanges and product walk-throughs fit in one generation.

The honest caveat: longer output only helps if you have enough to show. A single static subject doesn't look better at 30 seconds than at 5 — and it costs six times as much in credits. Hands-on testers report that the right metric isn't cost per generation, it's cost per edit-worthy shot, including every failed re-roll.

2. Director-level control: 10 keyframes, 15 references

This is the part that separates Kling 4.0 from the "type a sentence, get a clip" crowd. The Omni Reference system accepts up to 15 multimodal inputs — images, video clips, character subjects, even audio — and Multi-Keyframe Control lets you drop up to 10 keyframes to steer changes in character, scene, or camera across the shot.

In practice, that means showing the model what you want instead of describing it. One launch-week tester described adapting a fantasy tracking shot to a new setting, swapping the final character for a robot, and changing the robot's emotion at the exact moment a butterfly reached its hand — the kind of instruction that's nearly impossible to phrase as a single text prompt but easy to communicate when each visual ingredient gets its own reference slot.

My advice, borrowed from that same testing: give every reference a job. One for setting, one for character, one for camera movement, one for the emotional beat. Tossing unrelated images into the slots produces ambiguity, not control.

3. Bigger prompts, wider languages, agent access

Prompts now stretch to 8,000 tokens — enough to script each beat of a long take in detail. Audio gets two-channel stereo with more accurate lip sync, and the language list now includes Hindi and Indian English alongside English, Japanese, Korean, Spanish, Portuguese, German and French. For creators in India, that's a real change: dialogue scenes in Hindi were effectively unsupported in earlier versions.

Under the hood, Kling 4.0 also connects to MCP and command-line workflows, so developers can drive generations from their own agents and pipelines. Note the fine print, though: Kling's own developer API is listed as "coming soon" — MCP/CLI access is live, but the enterprise API isn't yet.

The credit math: what a video actually costs

Kling sells generation in credits, not minutes of video — but here's the part that surprised me: Kling publishes no per-generation credit prices on any public page. The old klingai.com pricing page now redirects to the Chinese regional homepage, kling.ai's pricing URLs redirect to the global homepage, and the developer API pricing doesn't list Kling 4.0 at all. Plan names, credit allocations and per-generation costs are visible only inside the signed-in app. So everything below comes from launch-week reviewers, not an official price list — treat it as a budgeting guide, not a quote.

The rates reviewers observed on October 16 were:

• Kling 4.0, 1080p: ~15 credits per second → a 30-second take works out to about 450 credits
• Kling 4.0, 720p: ~10 credits per second → a 30-second take works out to about 300 credits
• Kling 4.0 Flash, 720p: ~120 credits for a 20-second take

Those numbers suggest a natural two-stage workflow: draft with Flash to learn what the shot needs, move to the full model when continuity, action, or reference control justify the spend. But the deeper point is simpler — don't buy a plan until you've opened the app's pricing panel yourself. A "number of videos per month" figure on a plan card can be wildly optimistic once you generate 30-second 1080p takes, and free access isn't described on any of Kling's public pages. Rates can change, and the launch discount picture isn't clearly stated.

How Kling 4.0 compares: Flash and the previous generation

One correction to launch-day chatter worth making: 4K resolution itself isn't new in 4.0 — Kling 3.0 already offered it. The genuinely new output format is 10-bit HDR, and it isn't available yet.

What's still "coming soon" — the honest gap list

Launch marketing and the launch reality don't fully match. As of October 21, these announced features are marked coming soon:

• 10-bit HDR output (1080p and 4K) — the flagship new output format
• Video extension up to 2 minutes — extend a clip for longer storytelling
• Enterprise/developer API — MCP and CLI work, but Kling's own API isn't live

None of these are deal-breakers on their own, but if you're buying Kling 4.0 for HDR delivery or API integration today, know that you're buying a roadmap. Budget against what's live now.

Early reception: who is actually using it

Kling 4.0 didn't launch into a vacuum. Kuaishou says the platform serves more than 100 million users globally with about 50,000 corporate clients — real usage, not a beta with a waitlist. ChosunBiz reporting puts the footprint at 224 countries and annual revenue around $500 million.

The professional-film angle is where it gets interesting. Korean director Sung-Soo Kim, who directed 12.12: The Day, recreated a subway scene for his AI short film Worm Train with Kling 4.0 during its September preview — and used AI in his creative process for the first time. "The moment I recreated the subway scene with Kling 4.0 Preview, I was able to see the realistic physical interaction and sense of weight as the insect collided with passengers. It was the very scene I had given up back then," he said. Evolutionary Films is using the Omni Reference system for its animated feature Minibots, and Adobe has confirmed Kling's newest models are coming to Firefly — Kling 4.0 for cinematic storytelling and Flash for high-volume content.

Hands-on testers are more measured than the press release. The consensus from launch-week reviews: motion handling — contact, weight, prop deformation — holds up better in dense action scenes, and reference-driven control is genuinely useful. But nobody has published standardized quality, speed, or latency benchmarks, so comparisons with rivals like Seedance 2.5 rest on subjective A/B clips, not measurements.

Pros and cons

Pros

• 30-second native generation — scenes instead of clips
• Genuinely useful directing controls: 10 keyframes, 15 references
• Hindi and Indian English audio support at launch
• Two-channel stereo audio with better lip sync
• Flash tier gives a cheap drafting workflow
• MCP and CLI access for developers and agents

Cons

• Full-quality takes are expensive: ~450 credits for 30 seconds at 1080p
• HDR output, 2-minute extension and the API are all "coming soon"
• No standardized benchmarks — quality claims are vendor-reported or anecdotal
• Plan-card video counts can mislead (based on short 720p generations)
• Re-rolls dominate real cost; budget for failed attempts, not just headline prices

Who should try it — and who should wait

Try it now if you make short films, ads, or music videos and need directed, character-consistent shots; if you work in Hindi or Indian English dialogue; or if you want to experiment with reference-driven directing. Open the in-app pricing panel before you commit to anything, draft in Flash, and spend full-model credits only on your final takes.

Wait if you need 10-bit HDR delivery, API access, or video extension today — those are all coming soon, not live. And if your workflow needs measured, benchmarked quality before you commit budget, the data you want doesn't exist yet.

FAQ

When did Kling 4.0 launch?
Kuaishou opened Kling 4.0 to all users on October 16, 2026 (Beijing time), after a limited Flash preview for premium subscribers in late September.

How long can one Kling 4.0 generation be?
Up to 30 seconds in a single take at full quality; the lighter Flash tier runs up to about 20 seconds at 720p.

How much does Kling 4.0 cost per video?
Kling doesn't publish per-generation prices publicly — they're visible only inside the signed-in app. Launch-week reviewers observed about 450 credits for a 30-second 1080p take and 120 credits for a 20-second Flash take at 720p, but those are reviewer observations, not an official price list.

Does Kling 4.0 support Hindi audio?
Yes — Kling 4.0 added Hindi and Indian English to its multilingual audio support, with more accurate lip sync than earlier versions.

Is there an API for Kling 4.0?
MCP and CLI access are live for developers and agents, but Kling's own enterprise/developer API is marked as coming soon.

Key takeaways

• Kling 4.0 launched October 16, 2026 with native 30-second AI video generation — a full scene per take, not a stitched clip.
• Up to 10 keyframes and 15 reference assets give creators real directing control, including Hindi and Indian English dialogue scenes.
• Expect to pay roughly 450 credits for a 30-second 1080p take; the 120-credit Flash tier is the smart drafting model.
• 10-bit HDR, 2-minute video extension, and the developer API are all marked "coming soon" — buy for what's live, not the roadmap.
• No standardized benchmarks exist yet, so treat quality comparisons with rival video models as impressions, not measurements.

Kling 4.0 is the most control-heavy AI video model Kuaishou has shipped — and the first that feels aimed at filmmakers rather than casual prompters. Whether that control is worth the roughly 450 credits reviewers estimate per take depends entirely on how many re-rolls your shots need. I'll keep watching the "coming soon" list; if HDR and the API land, this becomes a different product.

Related reading: our Sora alternatives guide compares the other serious AI video options, VideoGen's Model 1 launch coverage covers the 10-minute AI video race, and our FLUX 3 Max review breaks down fal's 12-second video model.

Sources: Kling AI global launch press release (GlobeNewswire, October 16, 2026); kling.ai official site, developer pricing and model user guide; AI Affairs launch coverage; hands-on reviews by Dong Chenguang (dev.to) and kie.ai; ChosunBiz launch reporting. Vendor performance claims are flagged as company claims throughout. Credit rates are reviewer observations — Kling publishes no official per-generation price list publicly.