Built by Kling AI, part of Kuaishou
Kling 4.0: fast motion that holds together.
An AI video model whose headline improvement is steadier large motion: sprints, lunges, and cameras that circle the subject. One generation gives you 3 to 30 seconds of video with stereo audio. On AZ8 you can start from text, an image, a first and last frame, or a reference video.
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- Up to 30s
- With audio
- 4 aspect ratios
Last updated AZ8 Editorial Team
What is Kling 4.0?
Kling 4.0 is an AI video model from Kling AI, a unit of China's Kuaishou, opened to all users on October 15, 2026. A single generation produces up to 30 seconds of footage together with stereo audio.
Key takeaways
- Clips run 3 to 30 seconds, so a half-minute scene can come out as one take
- The developer lists high-speed action, tracking shots, and orbit shots among the areas it made more stable
- On AZ8 you pick from 4 aspect ratios (21:9, 16:9, 9:16, 1:1) and 2 modes, Standard and Pro
Best for
- You need fast sports or action shots
- Fifteen seconds is too short, and you want the whole scene in one generation
- Your travel promo or ad calls for a 21:9 widescreen frame
Kling 4.0 videos generated on AZ8
The AZ8 Editorial Team generated these four clips with Kling 4.0 on October 30, 2026. Each prompt appears exactly as it was submitted.
A kendo bout in a sunlit dojo
- 16:9
- 1080p
- 10s
Prompt
Two kendo fighters in dark blue armor face off in a wooden dojo lit by morning sun through tall windows. One lunges forward with a fast overhead strike, the other blocks and counters. The camera orbits around them in one smooth move, dust drifting in the light beams. Sharp bamboo sword impacts, stomping on the wooden floor, kiai shouts echoing
Carving through Hokkaido powder
- 16:9
- 1080p
- 8s
Prompt
A snowboarder in a bright orange jacket and goggles carves down a steep powder slope in Hokkaido, spraying a wave of fresh snow toward the camera. A fast tracking shot follows from the side, birch trees rushing past, snowflakes in the low winter sun. Wind rushing and the hiss of the board on snow
Flipping takoyaki at an Osaka stall (vertical)
- 9:16
- 1080p
- 5s
Prompt
Vertical close-up at a night food stall in Osaka: a vendor's hands flip takoyaki in a cast iron pan with metal picks, each ball turning golden, steam rising under warm paper lanterns. Sizzling batter and lively street chatter
A bullet train passing Mount Fuji (21:9)
- 21:9
- 1080p
- 8s
Prompt
Cinematic ultra-wide shot of a white bullet train speeding across the frame in front of snow-capped Mount Fuji on a clear morning, tea fields in the foreground, the camera slowly pans to follow it. The rush of the train and wind over the fields
All four were made with text to video, Pro mode, and audio turned on. No dialogue was requested. The kendo clip includes the fighters' shouts, and the other three carry only ambience and sound effects.
Kling 4.0 generation modes on AZ8
AZ8 offers the four modes below. Each one lets you set a length anywhere from 3 to 30 seconds.
- Text
Text to video
Write the scene and get a clip. Choose one of four aspect ratios, and with audio turned on, the sounds you describe are generated with the picture.
Prompt
A snowboarder in a bright orange jacket and goggles carves down a steep powder slope in Hokkaido, spraying a wave of fresh snow toward the camera. A fast tracking shot follows from the side, birch trees rushing past, snowflakes in the low winter sun. Wind rushing and the hiss of the board on snow
- Image
- Text
Image to video
Your image becomes the opening frame and the model animates from there. Audio is off by default in this mode, so switch it on if you want sound.
Prompt
The kimono-clad woman in the image opens a paper umbrella and walks slowly toward the camera along the stone path, cherry petals falling, gentle breeze
- First frame
- Last frame
First and last frame to video
Give it a starting image and an ending image, and it fills in the motion between them. Useful when you already know the closing shot, like a product landing in its hero pose.
Prompt
The camera rises from the empty ramen counter to an overhead view of the finished bowl, steam curling up, smooth continuous motion
- Image
- Video
- Audio
Character image plus reference video
Supply a picture of a character and one video to borrow motion from. You decide whether the character faces the way the image shows or the way the video shows, and whether to keep the video's original sound.
Prompt
The character from the image performs the same dance as the reference video, keeping the outfit and hairstyle from the image, plain studio background
Where Kling 4.0 shines
- 01
Fast action and orbiting cameras
Kling AI says footage stays stable through high-speed movement, continuous action, tracking shots, and orbit shots. We chose the kendo and snowboard subjects for our samples to put that claim to the test.
- 02
Thirty seconds in one pass
Because a full 30 seconds comes out of one generation, you avoid the character and style drift that creeps in when short clips are stitched together. Kling's own API documentation names this as the payoff of native long generation.
- 03
Stereo sound
The developer announced two-channel stereo output. All four clips we generated on AZ8 came back with two-channel audio.
Good fits
Sports and action mood films
Rough out club recruitment videos, sporting goods ads, or game trailers where the motion itself is the point.
- 16:9
- Pro
- 10 sec
Widescreen travel and regional promos
Frame landscapes like Mount Fuji or tea fields in 21:9 and gather candidate opening shots for signage or video ads.
- 21:9
- Pro
- 8 sec
Vertical food shorts
Show steam and browning up close in 9:16 to test the first few seconds of a Reel or TikTok for a restaurant.
- 9:16
- Standard
- 5 sec
Seedance vs Wan vs MiniMax: AI video models compared
The settings you can choose on AZ8, lined up on the same criteria.
| Feature | Seedance 2.5 | Seedance 2.0 | Kling 4.0This page | Wan 3.0 | MiniMax H3 |
|---|---|---|---|---|---|
| Developer | ByteDance | ByteDance | Kuaishou | Alibaba | MiniMax |
| Max length | 30s | 15s | 30s | 30s | 15s |
| Max resolution | 1080p | 4K | Not selectable | 1080p | 2K |
| Audio | Yes | Yes | Yes | Yes | Yes |
| 21:9 | Yes | Yes | Yes | — | Yes |
| Last frame control | Paired with first frame | Paired with first frame | Paired with first frame | Paired with first frame | On its own |
| Max reference images | 30 | 9 | No stated limit | 10 | 9 |
| Max reference videos | 10 | 3 | 1 | 5 | 3 |
| Max reference audio | 10 | 3 | — | 5 | 3 |
| Extend and edit | Yes | — | — | — | — |
| Open weights | Closed | Closed | Closed | Closed | Open |
Writing prompts for Kling 4.0
Kling's API guide suggests organizing a prompt around the scene, the camera movement, the order of events, and the sound. Our samples follow that order, written in English.
Name the camera move
Single terms such as orbit or tracking shot make it easier to get the kind of camera work the developer says it improved.
The camera orbits around them in one smooth move
Sequence events for longer clips
At 20 or 30 seconds, spell out what happens first and what happens next so the action keeps moving instead of stalling halfway.
First the runner ties her shoes, then sprints out of the station, finally stops at the shrine gate
Describe what you want to hear
With audio on, list the sounds you expect, like footsteps, wind, or the buzz of a busy shop.
Sharp bamboo sword impacts, stomping on the wooden floor
Kling 4.0 FAQ
What country is Kling AI from?
Kling AI belongs to Kuaishou Technology, a Chinese short-video platform company. AZ8 is run from the United States, and when you use Kling 4.0 on AZ8, the AZ8 Terms of Service and Privacy Policy govern that use.
Can I use Kling 4.0 for free?
Signing up for AZ8 is free, but each generation spends credits, so generating video is not covered by a free allowance. Any free plan or bonus on Kling AI's own site is a separate system from AZ8.
How much does Kling 4.0 cost on AZ8?
AZ8 bills in credits. The amount depends on the clip length and the mode, and Pro costs more than Standard for the same number of seconds. The pricing page lists the plans.
Is Kling 4.0 safe to use?
Generating in the browser does not require installing anything on your device. The real care point is what you upload: leave out confidential material and photos of people who have not agreed to it. Before publishing a result, check that it does not resemble a real person or someone else's work.
How do I use Kling 4.0?
Choose a generation mode, enter a prompt, then set the aspect ratio, length, and Standard or Pro before generating. Start with Standard and a short length to check framing and motion, then move to Pro or a longer clip once the idea is settled. That keeps wasted credits down.
Does it support Motion Control?
In Kling AI's official API, Motion Control is listed as a Kling 3.0 and Kling 2.6 feature. On AZ8, Kling 4.0 has a reference mode that takes a character image plus one motion reference video, and lets you choose whether the character's orientation follows the image or the video.
Does it handle Japanese or other non-English prompts and dialogue?
The developer lists Japanese, Chinese, Korean, and several European languages for both spoken dialogue and on-screen text. Our samples on this page use English prompts, and we have not yet tested spoken dialogue on AZ8.
How is it different from Kling 3.0?
According to Kling's comparison table, the length per generation grows from 3 to 15 seconds on Kling 3.0 to 3 to 30 seconds on Kling 4.0, and the 21:9 ratio and multi-keyframe input are exclusive to Kling 4.0. Kling 3.0 Pro is also available on AZ8 as a separate model.
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