Kling 3.0 arrived at the start of 2026 and brought native audio, multi-shot storytelling and clips up to 15 seconds. Kling 4.0, open to everyone since October 15, 2026, doubles the length, adds keyframes and stereo sound, and takes far more references at once. Here is the difference, from Kuaishou's own comparison and release notes.
At a glance
| Kling 3.0 | Kling 4.0 | |
|---|---|---|
| Length per generation | 3–15 s | 3–30 s |
| Keyframes | First and last frame | Up to 10 keyframes |
| Resolution (Kling's app) | 720p, 1080p, 4K | 720p, 1080p, 4K |
| Dynamic range | 8-bit SDR | 10-bit HDR at 1080p and 4K (listed as coming soon) |
| Audio | Single-channel | Two-channel stereo |
| Speech languages | Chinese, English, Japanese, Korean, Spanish | Adds Portuguese, German, French, Hindi and more |
| Reference images | Up to 7 without video, 4 with a video | Up to 10 images and 7 elements |
| Reference video | 1 clip, up to 15 s | Up to 5 clips, 30 s combined |
| References in total | Up to 7 | Up to 15 |
| 21:9 ultrawide | No | Yes |
Length: 15 seconds to 30
This is the change you notice first. A 15-second clip holds one action or a short exchange. At 30 seconds there's room to set up a scene, develop it and end it. Kling 4.0 is multi-shot by default, so it cuts between shots on its own unless you ask for one continuous take. Our prompt guide shows how to pace a 30-second prompt.
Keyframes: from two to ten
Kling 3.0 controls the first and last frame. Kling 4.0 takes up to 10 keyframe images along the timeline, so you can fix what happens at 0, 6, 12 and 20 seconds. On this site you get first and last frame; the middle keyframes are in Kling's own app.
Omni Reference: much bigger
Kling 3.0 Omni (the successor of Kling O1) took up to seven images or elements, or one video plus four images. Kling 4.0 takes up to 15 assets in one generation: 10 images, 5 videos with 30 seconds combined, voice references and 7 elements. Different references can do different jobs in the same render: a face from one image, a product from another, the camera move from a clip, the voice from an audio sample.
On this site Reference mode takes 10 images, 5 clips and 3 voice clips (5–30 s), 15 files in total, named @Image1, @Video1 and @Audio1 in the prompt. Saved elements aren't supported here.
Sound: stereo, more languages
Both generations make sound with the picture. Kling 4.0 moves from single-channel to two-channel stereo and Kuaishou reports better lip-sync. Speech adds Portuguese, German, French and Hindi to the five languages of Kling 3.0, plus regional accents.
Resolution: not the difference
Both versions render up to 4K in Kling's app; Kling 3.0 got native 4K in April 2026. Kling 4.0 adds 10-bit HDR at 1080p and 4K, which Kling lists as coming soon, and the 21:9 ratio. On this site Kling 4.0 renders at 720P or 1080P — there's no 4K or HDR here.
Editing and extension
Kling 4.0 brings video editing into the main model (change a subject, background, style or camera in existing footage), and Kuaishou lists extension up to 2 minutes as coming soon. Neither is offered on this site yet: a reference video guides a new clip but isn't edited.
Price on the official API
On Kling's API pricing page, where 1 unit is $0.14 at list price, Kling 3.0 with native audio is 0.9 units a second at 720p and 1.2 at 1080p. Kling 4.0 is listed as Coming Soon at 1.0 unit a second at 720p and 1.5 at 1080p (about $0.14 and $0.21). So per second, 4.0 is slightly more expensive than 3.0 with audio at the API level. For what a video costs here, see Kling AI pricing explained.
Which one should you use?
Kling 3.0 is still fine for short, prompt-led clips that fit in 15 seconds. Kling 4.0 is the better choice when you need more than 15 seconds, several references working together, stereo dialogue, or more control over timing. This site runs Kling 4.0 only.
Try Kling 4.0 — your first 5-second video is free.
Read more
Kling 4.0 Prompt Guide: Shots, Camera, Sound and References
How to write Kling 4.0 prompts that work: a simple shot structure, camera moves, dialogue and sound cues, @Image1 / @Video1 / @Audio1 references and pacing for 30-second clips.
Kling 4.0 vs Seedance 2.5: Which AI Video Model Should You Use?
Kling 4.0 against ByteDance's Seedance 2.5: both make 30-second clips with sound. How they differ on resolution, references, editing, API price per second and access, and when to pick each one.
Kling AI Pricing Explained: Plans, the Kling 4.0 API and Pay per Second
What Kling AI costs in October 2026: Kling's own monthly plans and credits, the Kling 4.0 API price ($0.14/s at 720p, $0.21/s at 1080p, still Coming Soon), and how per-second pricing works on this site.