Kling 4.0 is out. Kuaishou announced it on September 28, 2026, when the lighter Flash version opened to Ultra Yearly subscribers first. The full model reached all users on October 15, 2026, and the developer API opened on October 21.
Kling 4.0's biggest change is length: 30-second clips in a single generation, double the 15-second ceiling of Kling 3.0.
Last updated: October 27, 2026. Sources: Kling AI's official announcement on X (September 28, 2026), SandBase's launch timeline and API test (October 23, 2026), and our own Kling 4.0 API runs on October 27, 2026.
Is Kling 4.0 out yet?
Yes — Flash since September 28, the full model since October 15, the API since October 21.
| Release | Date | Who can use it |
|---|---|---|
| Announcement | September 28, 2026 | — |
| Flash | September 28, 2026 | Ultra Yearly subscribers first |
| Full model | October 15, 2026 | All users |
| API | October 21, 2026 | Developers, rolled out gradually |
The API version is narrower than the app. In our own two test runs on October 27, 2026 (3-second clips at 720p, one from text and one from a photo), it took text, a first frame and an optional last frame, returned 720p or 1080p, ran 3 to 30 seconds, and always included a stereo audio track. SandBase's API test lists the 10-keyframe control, multi-shot, voice "elements", 10-bit HDR and 4K as not available through the API yet.
Kling 4.0 release date: how it fits the cadence
| Version | Released | Notable step |
|---|---|---|
| Kling 1.0 | June 2024 | First public model |
| Kling 2.0 | April 2025 | Major quality leap |
| Kling 2.1 | May 2025 | Quality modes |
| Kling 2.5 Turbo | September 2025 | ~30% cheaper |
| Kling O1 | December 2025 | Unified multimodal tool |
| Kling 2.6 | December 2025 | Native audio, cinematic motion |
| Kling 3.0 | February 2026 | Native 4K, 60fps, 15s, multi-shot |
| Kling 4.0 | Sept 28, 2026 (Flash) · Oct 15, 2026 (full) · Oct 21, 2026 (API) | 30s single clips, 15 references, 10 keyframes |
The gap from 3.0 to this release was about eight months — shorter than the ten months between 2.0 and 3.0. The rollout repeated a pattern Kling has used before: Ultra subscribers first, everyone else later — here the gap was 17 days, and the API followed six days after that.
What's new in Kling 4.0
Kling AI's official Kling 4.0 announcement, September 28, 2026.
Live at launch
- 30-second clips in one pass — double the previous 15 seconds, with long takes and continuous narrative inside one clip.
- Up to 15 multimodal references per task — up to 10 images, 5 video clips, and 7 subjects, so characters, motion, camera work, and sound follow your material.
- Up to 10 keyframes to pin character states, scene changes, and plot beats.
- 8,000-token prompts, plus automatic expansion of short prompts.
- Video editing — add, change, or remove subjects and backgrounds; adjust style, weather, color, material, shot size, or viewpoint.
- Remake mode — analyzes the shot language and pacing of a reference video and builds a new commercial clip on that structure (social, product ads, fashion and beauty, electronics).
- 21:9 ultra-wide, dual-channel stereo audio, and tighter lip sync.
- Speech in 9 languages — Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French, and Hindi, plus accents and Chinese dialects such as Cantonese.
- On-screen text — multilingual text, emoji, and logos rendered inside the video.
- More stable fast motion, tracking shots, and orbiting camera moves.
Frame from Kling AI's official Kling 4.0 launch film — fast motion is one of the upgrades Kling highlights.
Listed as "coming soon"
- 4K and 1080p in 10-bit HDR.
- Video extension — continuing a clip several times to about 2 minutes.
Kling 4.0 vs Kling 3.0
| Kling 3.0 | Kling 4.0 | |
|---|---|---|
| Max single clip | 15 seconds | 30 seconds |
| Extension | — | ~2 minutes (coming soon) |
| References per task | Multi-reference | Up to 15 (10 images, 5 videos, 7 subjects) |
| Keyframes | Start / end frames | Up to 10 |
| Prompt length | Standard | 8,000 tokens |
| Output | Native 4K, 60fps | 4K / 1080p 10-bit HDR (coming soon), 21:9 |
| Audio | Native audio | Stereo audio, tighter lip sync, 9 languages |
| Availability | Public | Public since October 15 · API since October 21 |
If your work is 5–15 second social clips, Kling 3.0 already covers it. If you need one continuous 30-second shot, many reference images in a single task, or keyframed story beats, Kling 4.0 is the upgrade — keeping in mind that the reference and keyframe controls are in Kling's own app, while the API covers text, first and last frames, and length.
Frame from Kling AI's official Kling 4.0 launch film.
Will Kling 4.0 be free?
No — every Kling 4.0 clip is paid for, whether in credits or per second through the API. Through the API it is billed per second: about $0.14–0.16 at 720p and $0.21–0.24 at 1080p on the API price lists we read on October 27, 2026, so a 10-second 1080p clip costs a few dollars wherever you run it.
What you can use right now
You don't need an annual plan to make Kling 4.0 video with native audio today.
On kling4.co, Kling 4.0 Standard and Pro run the released model: text or a starting photo (plus an optional end frame) in, a single take of 3 to 30 seconds out, at 720p on Standard or 1080p on Pro, with native audio on every clip. Standard is 58 credits per second, so a 5-second clip is 290 credits; Pro is 75 per second. Packs start at $9.9, paid once, and the credits never expire.
- Kling 4.0 — Flash (75 credits for a 5-second clip), Flash HD, Standard, Pro, and 4K.
- Kling 3.0 — native 4K, native audio, up to 15s.
- Kling 3.0 Omni — reference-driven generation and editing.
Every generation shows the exact credit cost before you render, and failed generations are not charged. Compare pricing or open the AI video generator.
Frequently asked questions
When is the Kling 4.0 release date?
Kling 4.0 was released to all users on October 15, 2026. Kuaishou announced it on September 28, 2026, when Flash opened to Ultra Yearly subscribers first, and the API followed on October 21.
Is Kling 4.0 out yet?
Yes. The full model has been available to everyone since October 15, 2026, and through the API since October 21.
What is Kling 4.0 Flash?
The faster, lower-cost version of the new model, built for high-volume generation. It opened on September 28, 2026, first to Ultra Yearly subscribers, 17 days before the full release.
How long can Kling 4.0 videos be?
Up to 30 seconds in a single generation — double the previous 15 seconds. A video extension feature, listed as coming soon, will continue a clip to about 2 minutes.
Does Kling 4.0 support 4K?
Kling lists 4K and 1080p output in 10-bit HDR as coming soon, and the API returns 720p or 1080p. It also adds a 21:9 ultra-wide format and stereo audio.
Is there an API?
Yes, since October 21, 2026, rolled out gradually to developers. It covers text-to-video, first and last frames, 3 to 30 seconds, and 720p or 1080p with audio always on; keyframes, multi-shot and HDR are not in it yet.
Can I use it without an annual plan?
Yes. On kling4.co, Kling 4.0 Standard and Pro run the released model with no annual plan: packs start at $9.9, paid once, and a 5-second Standard clip with audio is 290 credits.
Start creating today
Kling 4.0 is out, and a 30-second take with sound is one generation. Open the AI video generator, see the Kling 4.0 model page, or compare pricing.
Working with the other models here, the equivalent guides are Kling O1 Guide and Kling 3.0 Omni Guide.
