# Kling 4.0 Flash

Kling 4.0 Flash is the fast tier of Kuaishou's Kling 4.0 video model. In Sloosh it makes clips of 5, 10, 15 or 20 seconds with sound at 720p, from text, a start frame, or up to 10 reference images and 5 reference videos. Kling 4.0 Flash Edit changes an existing clip of 3 to 20 seconds.

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

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

## Key facts in Sloosh

|   |   |
| --- | --- |
| Made by | Kuaishou (Kling AI) |
| Makes | video (with sound: always) |
| Inputs | text, start frame (optional), up to 10 reference images, up to 5 reference videos (each at least 3 seconds, 20 seconds combined) |
| Length | 5, 10, 15 or 20 seconds |
| Resolution | 720p |
| Aspect ratios | Auto, 16:9, 9:16, 1:1, 21:9 |
| Prompt limit | 26,000 characters |
| Edit version | Kling 4.0 Flash Edit: a source clip of 3 to 20 seconds, up to 10 reference images and 4 reference videos (20 seconds in all with the source), at 720p |

## Best for

- Drafting a video idea at 720p before a final run on [Kling 4.0](https://sloosh.ai/models/kling-4.0).
- Clips built from references: up to 10 images and 5 videos in one run.
- Changing a clip you already have with Kling 4.0 Flash Edit, under Edit in Studio.

## How to use Kling 4.0 Flash in Sloosh

1. Open [Video in Studio](https://sloosh.ai/studio/video?video-model=kling-4.0-flash) with Kling 4.0 Flash in the model chip.
2. Add references (up to 10 images and 5 videos, 20 seconds of video in total), or a start frame.
3. Pick the length (5, 10, 15 or 20 seconds) and aspect ratio.
4. Write the prompt and name references by position: @Image 1, @Video 1.
5. Press Generate; the price shows first.
6. To change a clip instead, open Edit in Studio and pick Kling 4.0 Flash Edit. The source clip is @Video 1.

## Kling 4.0 Flash prompting tips

- Name each reference by position, such as @Image 1 and @Video 1, and give it one job (Sloosh catalog).
- Keep the first run short. Flash takes 5 seconds as its default length in Sloosh.
- Sound is always on for this model, so describe the sound you want in the prompt.

## Kling 4.0 Flash example prompts

**Prompt 1**

```text
@Image 1 is the sneaker. A slow orbit around it on a wet rooftop at dusk, neon reflections in the puddles, light rain, soft city noise.
```

**Prompt 2**

```text
A barista pours latte art in a small cafe, close on the cup, warm morning light, gentle cafe sound.
```

**Prompt 3**

```text
@Video 1 sets the camera move. @Image 1 is the character. She walks through a night market following that same move, with lanterns overhead and crowd noise.
```

## How it compares in Sloosh

| Model | Length | Resolution | References | Prompt |
| --- | --- | --- | --- | --- |
| Kling 4.0 Flash | 5, 10, 15, 20 s | 720p | 10 images, 5 videos (20 s) | 26,000 |
| [Kling 4.0](https://sloosh.ai/models/kling-4.0) | 5, 10, 15, 30 s | 720p, 1080p | 10 images, 5 videos (30 s) | 2,500 |

Kling 4.0 also takes an end frame and renders at 1080p. Flash keeps to 720p and a start frame.

## Frequently asked questions

### What is Kling 4.0 Flash?

The fast tier of Kuaishou's Kling 4.0. In Sloosh it makes 5 to 20 second clips with sound at 720p.

### Kling 4.0 or Kling 4.0 Flash: which should I use?

Flash for 720p drafts and clips up to 20 seconds. [Kling 4.0](https://sloosh.ai/models/kling-4.0) for 1080p, an end frame or 30 second clips.

### Does Kling 4.0 Flash make sound?

Yes, always.

### How many references can I use?

Up to 10 images and 5 videos, with 20 seconds of video in total.

### Can Kling 4.0 Flash edit an existing video?

Yes, with Kling 4.0 Flash Edit. It changes a clip of 3 to 20 seconds with a prompt, up to 10 reference images and 4 reference videos.

### Can I use Kling 4.0 Flash without an API key?

Yes. Pick it in Video Studio; the exact price shows before you generate.

## Related

- Models: [Kling 4.0](https://sloosh.ai/models/kling-4.0), [Kling V3 Omni](https://sloosh.ai/models/kling-v3-omni-video), [Kling O3](https://sloosh.ai/models/kling-o3)
- Docs: [Models](https://sloosh.ai/docs/models.md)

## Sources

- [Kling: Kling 4 vs 3](https://kling.ai/blog/kling-4-vs-3)