Kling 4.0 is the newest AI video generation model from Kling AI, the video platform run by Kuaishou. Announced on September 28, 2026, it is built around three goals: visual realism, creative control and narrative completeness. In practice that means longer single generations (up to 30 seconds), up to 4K output, keyframe control, a much larger reference system and native stereo audio.
This guide covers what is new, the full Kling 4.0 spec sheet, how Kling 4.0 Flash differs, and when you can use it.
Kling 4.0 at a glance
- Release: announced September 28, 2026; full Kling 4.0 launches in October 2026
- Early access: Kling 4.0 Flash, live since September 28 for limited users (Ultra Yearly subscribers first)
- Length: 3–30 seconds per generation (Flash: 3–20 seconds)
- Resolution: 720p / 1080p / 4K, with 10-bit HDR coming
- Control: up to 10 keyframes and up to 15 Omni References
- Audio: two-channel stereo with more accurate lip sync
- Tagline: "You call the shots"
Kling 4.0 vs Kling 4.0 Flash: full specs
| Capability | Kling 4.0 | Kling 4.0 Flash |
|---|---|---|
| Generation length | 3–30 s | 3–20 s |
| Resolution | 720p / 1080p / 4K | 720p |
| Dynamic range | 10-bit HDR (1080p, 4K — coming soon) | 8-bit SDR |
| Aspect ratios | 21:9 / 16:9 / 1:1 / 9:16 / Auto | Basic ratios |
| Audio | Stereo + more accurate lip sync | Supported |
| Multi-keyframe | Up to 10 keyframe images | Limited |
| Omni Reference | Up to 15 multimodal references | Supported |
| Reference breakdown | Up to 10 images + 5 videos (≤30 s total) + 7 elements incl. voice | — |
| Text input | Up to 8,000 tokens | — |
| Video editing | Up to 5 input videos (1 main) | — |
Flash is the lighter, faster model. The full Kling 4.0 is the one to watch for 4K, HDR, 21:9 and the complete 30-second capability.
What's new in Kling 4.0
Native 30-second storytelling
Most video models top out at 10–15 seconds, which forces you to stitch shots together. Kling 4.0 generates up to 30 seconds in one pass, long enough for a scene with a beginning, a turn and an ending. Video extension lets you add more before or after an existing clip.
Up to 10 keyframes
Instead of relying on one prompt, you can pin up to 10 keyframe images — a character's pose, a location change, a story beat — and Kling 4.0 generates the motion between them. It works much more like directing from a storyboard.
Omni Reference with 15 inputs
Omni Reference mixes images, videos, characters and voices in a single request:
- up to 10 images
- up to 5 videos, 30 seconds combined
- up to 7 elements, including voice references
That is what keeps a character's face, a product's details, a movement style or a camera move consistent from shot to shot. Clay-render and depth-map videos can also be used as motion references.
Better audio and visuals
Large, dynamic scenes stay more stable and complex camera moves are smoother. Kling 4.0 generates two-channel stereo audio together with the picture, and lip sync is noticeably tighter. Facial micro-expressions, lighting and textures look more real.
Video editing and creative remix
You can make targeted changes to an existing video — expression, action, camera, style or background — without regenerating the whole clip. Creative remix follows the rhythm and composition of a reference video while you swap in your own character or product.
Languages, accents and on-screen text
Kling 4.0 speaks Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French, Indonesian and more, with German, French and Indonesian newly added. It also handles accents and dialects: American, British and Indian English, plus Beijing, Taiwanese, Northeastern, Sichuan and Cantonese Chinese. On-screen text in multiple languages — including emoji — renders more clearly and stays stable.
Professional output
4K, upcoming 10-bit HDR and a 21:9 ultra-wide ratio make Kling 4.0 a fit for film pre-visualization, ads, short dramas and music videos, not just social clips.
THE BEAT: the official Kling 4.0 short
Alongside the announcement, Kling AI released THE BEAT, a short film made entirely with Kling 4.0 about a drummer returning to the stage. It became the most-viewed Kling 4.0 post on X within a day. You can watch it on Kling AI's X account.
What early testers are saying
Creators with Flash access posted their first tests within hours. Common themes:
- Realism stands out, especially for photoreal footage and single-prompt long takes.
- Lip sync and dialogue in multiple languages and accents hold up across full shots.
- On-screen text is clearly better than earlier versions.
- Speed and cost: one Japanese creator reported a 5-second Flash clip cost under ¥50, roughly one fifth of Seedance 2.5.
We collected the most-viewed posts in Kling 4.0 Flash early reviews.
How to try Kling 4.0
- Open the AI video generator.
- Upload reference images or videos and describe the scene; use @ mentions to say what each reference is for.
- Choose length and aspect ratio, then generate. Extend or edit the result instead of starting over.
See pricing for credit plans.
FAQ
When does Kling 4.0 come out? The full model launches in October 2026. Kling 4.0 Flash has been in early access since September 28, 2026.
How long can a Kling 4.0 video be? 3–30 seconds per generation (Flash: 3–20 seconds), plus video extension.
What resolution does Kling 4.0 support? 720p, 1080p and 4K, with 10-bit HDR coming for 1080p and 4K. Flash is 720p SDR.
What is Omni Reference? Up to 15 references in one request — 10 images, 5 videos (≤30 s total) and 7 elements including voice — for consistent characters, products and motion.
Is Kling 4.0 better than Kling 3.0? It adds 30-second generation, 10 keyframes, 15-input Omni Reference, stereo audio with better lip sync, video editing and clearer text. Early side-by-side tests of Flash vs 3.0 favored 4.0 on quality and prompt adherence.
Is kling4.run the official Kling website? No. kling4.run is an independent service and is not affiliated with Kuaishou or Kling AI. The official website is kling.ai.
