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Announced 28 September 2026
Kling 4.0 is announced. Almost nobody can use it yet.
Kling posted a film of 2 minutes 37 seconds made with Kling 4.0. Thirty-eight minutes later came a trailer full of 4K shots, with the news that the model itself comes in October. What opened today is Kling 4.0 Flash, a lighter version, and only for people on the Ultra yearly plan.
- Full Kling 4.0
- October 2026
- Kling 4.0 Flash
- Ultra yearly only
- Kling API
- No 4.0 yet
- On UlazAI
- Kling 3.0 and O3
What Kling announced
Kling posted the announcement on X at 15:38 UTC on 28 September 2026. It opens with two lines that matter more than the feature list: "Kling 4.0 is coming this October. Kling 4.0 Flash is live now for Ultra Yearly subscribers." Then four promises:
- "Stable dynamic motion, high-quality stereo audio, more accurate lip sync, up to 4K resolution, and 10-bit HDR output."
- "Up to 15 multi-modal references, more consistent results, and enhanced video editing."
- "Multi-keyframe control supporting up to 10 keyframes, native 30-second generation."
- "Video extension, support for multiple languages, accents, and dialects."
Source: Kling AI on X. None of this has been tested independently yet, because the full model is not out. One small check we could do: the 4K versions of both Kling videos on X are 8-bit files. That says more about X than about the model, but it means you cannot see the 10-bit HDR claim in anything published so far.
THE BEAT, the film Kling made with 4.0
Kling's showcase is a short film about a drummer who loses her kit and comes back on stage. It runs 2 minutes and 37 seconds and Kling calls it "created with Kling 4.0". It does not say whether that is Flash or the full model.
We ran a cut detection over the film (ffmpeg, scene threshold 0.30). It has 92 shots with a median length of 1.1 seconds. One stretch is different: a 30.1 second phone argument in a loft with no hard cut, only camera angle changes. That is the one scene where a character talks for a while, and it is the part one reply on X called out for drifting and lip sync. The rest is quick montage, which hides that kind of problem.
Kling 4.0 next to what you can use now
The 4.0 column is Kling's announcement. The other three columns are the models as they run in UlazAI Video Studio today.
| Kling 4.0 (announced) | Kling 3.0 | Kling O3 | Seedance 2.5 | |
|---|---|---|---|---|
| Clip length | Native 30 s; Flash testers report up to 20 s | 3 to 15 s | 3 to 15 s, up to 6 written shots | 4 to 30 s |
| Resolution | Up to 4K, 10-bit HDR | Standard, Pro, 4K mode | 720p, 1080p, 4K | 480p, 720p |
| References | Up to 15 multi-modal | Start and end frame | Up to 7 images, or a video plus up to 4 images | Up to 50 multimodal |
| Keyframes | Up to 10 | First and last frame | First and last frame | First and last frame |
| Audio | Stereo, more languages and accents | Native audio | Native audio (not with video input) | Generated audio |
| Price | Flash: Ultra yearly plan, $1,429.99 per year at Kling | From 20 credits per second | From 84 credits (5 s, 720p) | From 28 credits per second (480p) |
| Where | Kling app, Ultra yearly | Kling 3.0 on UlazAI | Kling O3 on UlazAI | Seedance 2.5 on UlazAI |
What early testers posted on 28 September
From about an hour before the announcement, creators with early access posted their first Flash clips. Kling opened Flash to a selected group of creators first, and three of the eleven posts we counted mention Kling's creative partner program (#KlingCPP, or CPP in the text). So they are not fully independent reviewers. Still, these are the only Kling 4.0 clips that did not come from Kling itself.
Flash clips stop at 20 seconds, mostly
Kling promises "native 30-second generation" for Kling 4.0. A Japanese tester wrote that Flash goes up to 20 seconds (in the post above: "4.0 Flash は最大20秒"). Kling itself has not said that. So we looked at the files.
We read the length of every video attached to 11 posts from 10 early testers that name Kling 4.0 Flash, 12 uploads in total. Five end at 20.0 to 20.1 seconds. That is too neat to be a coincidence, and it fits the 20 second limit the tester reported.
Two uploads run longer. One is a montage of five 5-second clips, so it says nothing about a single generation. The other is a 25.8 second dark fantasy scene. Either its maker edited takes together, or Flash can go past 20 seconds in some settings. We don't know which. Eight of the twelve uploads are about 1280 by 720, so most testers posted 720p.
Showcase clips from Kling that a tester reposted (@alisaqqt) are not counted. This is a count of what people posted, not a spec. X can re-encode and creators can trim. When Kling publishes the Flash limits, those numbers win.
What early access costs at Kling
On 28 September at 20:10 Dutch time, Kling's membership page listed Kling 4.0 Flash only under Ultra, labelled "Annual Early Access". The yearly prices:
| Plan | Per year | Credits per month | 4.0 Flash |
|---|---|---|---|
| Standard | $79.20 | 660 | No |
| Pro | $293.04 | 3,000 | No |
| Premier | $728.64 | 8,000 | No |
| Ultra | $1,429.99 | 26,000 | Yes |
The credit cost of one Flash clip is not visible without an Ultra login. And on the developer side, Kling's API pricing page says it plainly: "These plans currently don't support Kling 4.0." Kling 3.0 is on that API, including 4K, so 4K on its own is not what 4.0 adds.
What you can make today
Kling 4.0 is not in UlazAI, because Kling does not offer it on its API yet. These three are in Video Studio now, priced per second in credits, without a yearly plan:
Kling O3
Kling 3.0 Omni with four modes: text, image, reference and transformation. Up to 3 named subjects and 6 written shots, 720p to 4K. From 84 credits for 5 seconds at 720p. Kling O3 details
Kling 3.0
Text-to-video and image-to-video with start and end frame and native audio, 3 to 15 seconds. From 20 credits per second in Standard mode. Kling 3.0 details
Seedance 2.5
The model most testers compared Kling 4.0 Flash against. 4 to 30 seconds, 480p or 720p, up to 50 references. From 28 credits per second at 480p. Seedance 2.5 details
Questions people ask about Kling 4.0
- When is Kling 4.0 released?
- Kling wrote on 28 September 2026 that Kling 4.0 is "coming this October". It did not give a date.
- What is Kling 4.0 Flash?
- The lighter version of Kling 4.0 that opened on 28 September 2026, for Ultra yearly subscribers. Early testers report clips of up to 20 seconds. The full model is announced with native 30 second generation.
- How much does Kling 4.0 Flash cost?
- At Kling it comes with the Ultra yearly plan: $1,429.99 per year with 26,000 credits per month. What one Flash clip costs in credits is not public yet.
- Is Kling 4.0 available through an API?
- Not yet. Kling's API pricing page says "These plans currently don't support Kling 4.0." Kling 3.0 is available on the API.
- Can I use Kling 4.0 on UlazAI?
- No. UlazAI runs on API access, and Kling does not offer 4.0 there yet. You can use Kling O3, Kling 3.0 and Seedance 2.5 today.
Sources, all read on 28 September 2026: Kling 4.0 announcement, THE BEAT on X, THE BEAT on YouTube, Kling membership plans, Kling API pricing, and the tester posts embedded above.
Work out the idea now, not in October.
Write and test your prompt, shots and references in Kling O3 today. When Kling 4.0 opens up, you already know what you want to see.