# Kling 4.0

Kling 4.0 is Kuaishou's newest video model, launched on 15 October 2026. In Sloosh it makes clips of 5, 10, 15 or 30 seconds with sound at 720p or 1080p, from text, start and end frames, or up to 10 reference images and 5 reference videos. Kuaishou built it for longer clips and steadier, more complex camera moves.

Web page: https://sloosh.ai/models/kling-4.0

[Use Kling 4.0](https://sloosh.ai/studio/video?video-model=kling-4.0)

## Key facts in Sloosh

|   |   |
| --- | --- |
| Made by | Kuaishou (Kling AI) |
| Makes | video (with sound: always) |
| Inputs | text, start frame (optional), end frame (optional, needs a start frame), up to 10 reference images, up to 5 reference videos (each at least 3 seconds, 30 seconds combined) |
| Length | 5, 10, 15 or 30 seconds |
| Resolution | 720p, 1080p |
| Aspect ratios | Auto, 16:9, 9:16, 1:1, 21:9 |
| Prompt limit | 2,500 characters |

## Best for

- Longer single clips: Kling says "Kling 4.0 extends native generation to 30 seconds in a single pass" ([Kling](https://kling.ai/blog/kling-4-vs-3)).
- Mixing many references in one task: Kling's Omni Reference takes images, videos, subjects and voices, including up to 10 images and 5 videos ([Kling](https://kling.ai/blog/kling-4-vs-3)).
- Ultrawide 21:9 cinematic shots, which Kling added in 4.0 ([Kling](https://kling.ai/blog/kling-4-vs-3)).
- Multilingual dialogue: Kling lists Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French and Hindi with improved lip-sync ([Kling](https://kling.ai/blog/kling-4-vs-3)).
- Long product stories.

## How to use Kling 4.0 in Sloosh

1. Open [Video in Studio](https://sloosh.ai/studio/video?video-model=kling-4.0) with Kling 4.0 in the model chip.
2. Add references (up to 10 images and 5 videos, 30 seconds of video in total), or a start frame and optional end frame.
3. Pick the length (5, 10, 15 or 30 seconds), resolution and aspect ratio (Auto, 16:9, 9:16, 1:1, 21:9).
4. Write the prompt and name references by position: @Image 1, @Video 1.
5. Press Generate; the price shows first.

## Kling 4.0 prompting tips

- Two ways to prompt, per Kling: a simple prompt that lets the model develop the idea, or detailed direction that sets more of the scene ([Kling](https://kling.ai/blog/kling-4-vs-3)).
- Name each reference by its position, @Image 1, @Video 1, in the order you added them (Sloosh catalog description; Kling's 3.0 Omni guide uses the same @Image 1 tag style, [Kling](https://kling.ai/quickstart/klingai-video-3-omni-model-user-guide)).

## Kling 4.0 example prompts

**Prompt 1**

```text
@Image 1 is the runner, @Video 1 shows the trail. A 30-second sequence: the runner laces up at dawn, sets off along the trail, climbs a ridge and stops at the top as the sun rises. Smooth tracking shot, then a slow orbit at the summit. Sound: breathing, footsteps on gravel, wind.
```

**Prompt 2**

```text
Ultrawide 21:9. The car from @Image 1 drives along a coastal road at golden hour; the camera tracks alongside, then rises above it. Sound: engine hum, waves.
```

**Prompt 3**

```text
Start on the start frame of the empty café; staff set tables and open the doors, ending on the end frame of the first customer walking in. Barista (cheerful, English): "Good morning!" Sound: chairs scraping, a door bell.
```

## How it compares in Sloosh

|   | Kling 4.0 | Kling V3 Omni | Kling 3.0 | Grok Imagine 1.5 |
| --- | --- | --- | --- | --- |
| Length | 5, 10, 15, 30 s | 3 to 15 s | 3 to 15 s | 4 to 15 s |
| References | 10 images, 5 videos | 7 images | none | 14 images |
| Resolution | 720p, 1080p | 720p, 1080p | no setting | up to 1080p |
| 21:9 | yes | no | no | yes |
| Sound | always | optional | optional | always |

## Where else it runs

- Kling AI app; Kling API (4.0 API live per Kling's developer docs, via search listing).

## Frequently asked questions

### When did Kling 4.0 come out?

Kuaishou says the full Kling 4.0 launched on 15 October 2026, after Kling 4.0 Flash early access from 28 September 2026.

### How long can a Kling 4.0 video be?

Up to 30 seconds. Sloosh offers 5, 10, 15 or 30 seconds.

### How many references does Kling 4.0 take?

Up to 10 images and 5 videos in Sloosh, with the videos at most 30 seconds combined.

### Does Kling 4.0 make sound?

Yes, every clip has sound in Sloosh. Kling says 4.0 audio is two-channel stereo ([Kling](https://kling.ai/blog/kling-4-vs-3)).

### Kling 4.0 vs Kling 3.0?

4.0 doubles the longest clip to 30 seconds, adds video references and 21:9; 3.0 in Sloosh animates a required start image for 3 to 15 seconds with no references.

### How do I refer to references in a Kling 4.0 prompt?

Type @ in the Sloosh prompt box and pick the reference; it reads as @Image 1, @Image 2 or @Video 1, numbered in the order you added them.

### What is Kling 4.0?

Kuaishou's newest Kling video model, launched on 15 October 2026, with up to 30-second clips, stereo sound and image plus video references ([Kling](https://kling.ai/blog/kling-4-vs-3)).

## Related

- Models: [Kling V3 Omni](https://sloosh.ai/models/kling-v3-omni-video), [Kling 3.0](https://sloosh.ai/models/kling-3.0), [Grok Imagine 1.5](https://sloosh.ai/models/grok-imagine-1.5)
- Spaces: [Cinematic Ad Sequence](https://sloosh.ai/spaces/cinematic-ad-sequence)
- Answers: [What is the best AI video model in 2026?](https://geo.sloosh.ai/posts/what-is-the-best-ai-video-model-in-2026)

## Sources

- [Kling: Kling 4.0 vs 3.0](https://kling.ai/blog/kling-4-vs-3)
- [Kuaishou IR: Kling AI officially launches Kling 4.0](https://ir.kuaishou.com/news-releases/news-release-details/kling-ai-officially-launches-next-generation-kling-40-raising)
- [Kling: Meet all-new Kling 4.0](https://kling.ai/dev/model-release/kling-4)
- [Kling: VIDEO 3.0 Omni user guide](https://kling.ai/quickstart/klingai-video-3-omni-model-user-guide)