Kling 4.0 is the biggest update Kling has shipped. It makes 30-second videos in one go, lets you plan a scene with up to 10 keyframes, and uses up to 15 reference files to keep a character or product looking the same from shot to shot. But it also costs more per clip than most creators expect.
Here’s what Kling 4.0 actually does, what early testers found, what a finished video really costs, and whether it’s worth paying for if you’re a freelancer, creator or small business.
Quick verdict
Our early rating: 8/10. Kling 4.0 is one of the strongest AI video generators you can use right now for short ads, explainers and story-driven social clips. Thirty seconds in one generation means much less stitching, and the keyframe and reference tools give you real control over what happens on screen.
- Best for: product ads, short brand stories and social videos where the same person or product has to stay consistent
- Weakest at: cheap, high-volume testing. A 30-second 1080p clip uses 450 credits, and the cheapest plan only has 660
- Watch out for: small details the model adds on its own, and 30-second clips that include cuts you didn’t ask for
How we reviewed Kling 4.0
We read Kling’s official 4.0 release note and spec sheet, checked Kling’s plan and API pricing pages, and compared the hands-on tests published by early testers, including Kling creative partners, independent reviewers and AI video platforms that added the model at launch. Every source is linked so you can check it yourself. Kling’s plans change often, so confirm prices on kling.ai before you subscribe.
What is Kling 4.0?
Kling 4.0 is the newest AI video model from Kuaishou, the Chinese tech company behind Kling AI. A lighter version, Kling 4.0 Flash, opened to Ultra yearly subscribers on September 28, 2026, and the full model went live for everyone on October 15, 2026 (Atlas Cloud). Kling announced the global launch the next day and says the platform now serves over 100 million users and 50,000 business customers (GlobeNewswire via Yahoo Finance).
Adobe also said Kling 4.0 and Kling 4.0 Flash are coming to Firefly, so you may soon be able to use it inside Adobe’s tools too.
| Feature | Kling 4.0 |
|---|---|
| Made by | Kuaishou (Kling AI) |
| Full launch | October 15, 2026 |
| Clip length | 3 to 30 seconds in one generation |
| Resolution | 720p, 1080p, 4K |
| Keyframes | Up to 10 images on a timeline |
| References | Up to 15 (images, videos, characters, voice) |
| Audio | Stereo sound with lip-synced dialogue |
| Aspect ratios | 21:9, 16:9, 1:1, 9:16 |
| Prompt length | Up to 8,000 tokens |
| Coming soon | 10-bit HDR and video extension up to 2 minutes |
Specs from Kling’s release note as summarised by Atlas Cloud.
What’s new in Kling 4.0 vs Kling 3.0
- 30 seconds in one pass. That’s double what Kling 3.0 could make in a single generation. For a 30-second ad, you no longer have to generate two clips and hope they match.
- Up to 10 keyframes. Instead of just a first and last frame, you can pin up to 10 images on a timeline and Kling animates the path between them. This is the closest AI video has come to working from a storyboard.
- Omni Reference with 15 inputs. One generation can use up to 10 images, up to 5 videos (30 seconds total) and up to 7 saved characters or objects, all within a cap of 15. Audio input is limited to a voice reference, so add music in your editor.
- Better dialogue. Kling 4.0 supports spoken lines in several languages, including English, Spanish, Portuguese, German, Japanese and Korean, with American, British and Indian English accents.
- Readable text in the video. Signs, labels and on-screen captions come out spelled correctly far more often than in 3.0.
- Video editing. You can upload existing clips and swap a product, add or remove a subject, or change the style while keeping the shot.
One thing that isn’t new: 4K. Kling added native 4K back in April 2026 with Kling 3.0. And two headline features, 10-bit HDR and 2-minute video extension, are still marked “coming soon” by Kling, so don’t plan client work around them yet.
Kling 4.0 vs Kling 4.0 Flash
| Kling 4.0 | Kling 4.0 Flash | |
|---|---|---|
| Max length | 30 seconds | 20 seconds |
| Max resolution | 4K | 720p |
| Multiple keyframes | Yes, up to 10 | Not listed |
| Best for | Finished ads and story videos | Fast drafts and high-volume social clips |
Flash is the cheaper, faster option for testing ideas. One invited tester said the full model beat Flash on picture quality, audio clarity and lip sync (Kie.ai). Draft in Flash, then render the final version in the full model.
What early testers found
Motion holds up in fast scenes
Kling creative partner Johnson Sheng reported that characters stayed stable during a fast whip pan and a handheld push-in, and that the model understood an unusual prop and how it should be used (Kling on X). Another side-by-side test found that fast-moving frames didn’t smear or ghost the way they sometimes did in Kling 3.0 (YouArt).
It follows long, detailed prompts
The same Sheng test used a prompt of around 1,000 characters, two character references and one scene image to make a full 30-second fight sequence. YouArt’s comparison found Kling 4.0 kept every element of a complex prompt in the right place, while Kling 3.0 tended to drop or merge the smaller details.
Lip sync is much better
Lip sync drifting out of time during long dialogue was a known Kling 3.0 problem. In dialogue-heavy tests of Kling 4.0 Flash, that drift largely disappeared (MindStudio). That matters if you make talking-head ads, UGC-style videos or explainer clips.
Where it slips
- It adds things you didn’t ask for. Testers documented the model inventing details that weren’t in the reference, like a gray jacket that never appeared in the source image (Miraflow). Check every frame before a clip goes to a client.
- 30 seconds doesn’t always mean one continuous shot. A city-chase test produced a long connected take, but the reviewer warned that a 30-second clip can still include cuts (DEV Community).
- Slower at busy times. Kling 4.0 jobs appeared to queue longer than Kling 3.0 jobs during peak hours.
- Not always the steadiest. In early comparisons with ByteDance’s Seedance 2.5, testers gave Kling the edge on motion and impact, but said Seedance was more stable overall (Kie.ai).
Kling 4.0 pricing: what a video really costs
Kling 4.0 runs on Kling’s normal credit plans. There’s no separate Kling 4.0 subscription.
| Plan | First month | Monthly after that | Credits per month |
|---|---|---|---|
| Basic | Free | Free | No monthly credits |
| Standard | $6.99 | $8.80 | 660 |
| Pro | Discounted | $32.56 | 3,000 |
| Premier | Discounted | $181.99 | 18,000 |
| Ultra+ | $402 | $544.99 | 57,000 |
Prices from Kling’s membership page as of October 19 to 23, 2026, reported by TechPilot and Wireflow. Pro and higher plans get 10% off Kling 4.0 generations. Prices vary by region and change often.
Kling 4.0 is charged per second of video: 10 credits a second at 720p and 15 credits a second at 1080p (Kie.ai).
| Clip length | 720p | 1080p |
|---|---|---|
| 5 seconds | 50 credits | 75 credits |
| 10 seconds | 100 credits | 150 credits |
| 30 seconds | 300 credits | 450 credits |
What that means in real clips (10-second clips at 1080p, before discounts and re-rolls):
- Standard (660 credits): about 4 clips a month
- Pro (3,000 credits): about 20 clips a month
- Premier (18,000 credits): about 120 clips a month
In practice you’ll rarely use the first result. Budget for 2 to 3 attempts per finished clip, so a Pro plan realistically gives you 7 to 10 finished 10-second videos a month.
Is Kling 4.0 free?
Not really. Kling hasn’t announced free Kling 4.0 generations, and the free Basic plan adds a watermark and doesn’t allow commercial use. Paid plans remove the watermark and include commercial rights.
Kling 4.0 API pricing
Developers pay per second through Kling’s API: 1 unit a second at 720p and 1.5 units a second at 1080p. With the smallest API package ($500 for 3,250 units), that works out to roughly $0.15 a second at 720p and $0.23 a second at 1080p (Kling API pricing).
Try it yourself: 4 Kling 4.0 test prompts
These four prompts test the jobs freelancers and small businesses actually pay for. Run them at 720p and they use about 550 credits, which fits inside the Standard plan.
1. Product ad with a reference image (10 seconds): Upload a product photo, then: A slow push-in on [product] on a marble counter in soft morning light. A hand picks it up and turns it toward the camera. On-screen text at the end: “Shop now at [yourbrand].com”. What to check: Does the product match your photo, and is the text spelled right?
2. Talking-head UGC clip (10 seconds) A woman in her 30s sits at a kitchen table and speaks to the camera in a friendly American accent: “I tried this for two weeks, and honestly, I’m not going back.” Natural daylight, handheld phone camera. What to check: lip sync, and whether the voice sounds natural.
3. Short brand story with keyframes (30 seconds) Upload 3 to 4 keyframes (for example: a closed coffee shop at dawn, the owner unlocking the door, the first customer, a full shop at noon). One continuous story of a small coffee shop’s first day, following the owner. What to check: does it hit every keyframe, and is it one shot or does it cut?
4. Text on a sign (5 seconds) A street-level shot of a bakery with a hand-painted sign reading “Sarah’s Bakery, Since 2019”. Light rain, people walking past. What to check: spelling on the sign while the camera moves.
Kling 4.0 vs other AI video generators
- Kling 4.0 vs Kling 3.0: 4.0 is better at long prompts, motion, lip sync and text. 3.0 is cheaper and faster for simple 5 to 10 second clips.
- Kling 4.0 vs Seedance 2.5: early testers say Kling has more energy and impact, Seedance is steadier.
- Kling 4.0 vs Veo 3.1 and Runway: see our Runway vs Kling vs Veo vs Pika comparison for how they compare on quality, control and price.
For the full list of tools we recommend, see our best AI video generators guide.
Who should use Kling 4.0?
- Small business owners who want short product ads and social videos without hiring a videographer.
- Freelance video editors and social media managers who need the same character or product to stay consistent across a series of clips.
- Content creators making story-driven shorts, where 30 seconds and keyframes save a lot of stitching.
Skip it if you mainly need cheap, high-volume test clips (use Kling 4.0 Flash or 3.0), or talking-avatar training videos, where a dedicated avatar tool fits better.
Need a voiceover or music on top? Kling only takes a voice reference, so pair it with one of the best AI voice generators and finish the edit in a tool like FlexClip. For thumbnails and ad graphics, Canva Craft handles text in images well.
One safety tip
Kling’s popularity has attracted scammers. In 2025, fake Kling AI ads on Facebook led people to malware disguised as the app (The Hacker News). Only sign up at kling.ai, and don’t download “Kling” files from ads or third-party sites. Before using AI video for clients, read our guide on how to use AI responsibly.
Final verdict
Kling 4.0 is a real step up. Thirty-second clips, 10 keyframes and 15 references make it one of the most controllable AI video generators available, and early tests show clear gains in motion, lip sync and text. The catch is price: at 15 credits a second for 1080p, the Standard plan is only enough to try it. If you make video for clients every week, Pro is the realistic starting point. Draft in Flash, finish in 4.0, and check every frame for details you didn’t ask for.
Want to see where Kling sits against everything else? Check our AI tool tier list and best AI tools for content creators.
Kling 4.0 FAQ
When was Kling 4.0 released?
Kling 4.0 Flash opened to Ultra yearly subscribers on September 28, 2026. The full model became available to everyone on October 15, 2026.
Is Kling 4.0 free?
No. Kling hasn’t announced free Kling 4.0 generations. Paid plans start at $6.99 for the first month, then $8.80 a month.
How much does a Kling 4.0 video cost?
10 credits a second at 720p and 15 credits a second at 1080p. A 10-second 1080p clip uses 150 credits, and a 30-second 1080p clip uses 450.
How long can Kling 4.0 videos be?
Up to 30 seconds in one generation. Video extension up to 2 minutes is listed as coming soon.
Does Kling 4.0 make 4K video?
Yes, it supports 720p, 1080p and 4K. The 10-bit HDR option isn’t available yet.
What’s the difference between Kling 4.0 and Kling 4.0 Flash?
Flash is faster and cheaper but limited to 20 seconds at 720p, with no multi-keyframe support. The full model goes to 30 seconds and 4K.
Can I use Kling 4.0 videos commercially?
On paid plans, yes. The free Basic plan doesn’t allow commercial use and adds a watermark.
