# Kling

> Kling 3.0 on Zurelay: 720p and 1080p clips of 3 to 15 seconds, first and last frames, negative prompts, and cheaper silent video.

Source: https://zurelay.com/docs/kling

Kuaishou’s Kling 3.0: lifelike motion and confident camera work, 3 to 15 second clips at 720p and 1080p, with sound you can turn off to pay less.

## Prices

| Model | Resolution | With sound, per second | Silent, per second |
| --- | --- | --- | --- |
| [Kling 3.0](https://zurelay.com/models/kling-3.0) | 720p | $0.185 | $0.125 |
| [Kling 3.0](https://zurelay.com/models/kling-3.0) | 1080p | $0.235 | $0.18 |

A clip costs its length times the rate: a 5 second 720p clip is $0.925 with sound or $0.625 silent. It’s charged only when the video is delivered.

## What it takes

- A prompt of up to 2,500 characters, and optionally a `negative_prompt` (up to 2,500) of things to keep out.
- A `first_frame` to animate, and optionally a `last_frame` to land on. Kling doesn’t take reference images.
- Lengths from 3 to 15 seconds, in whole seconds.
- 16:9, 9:16 and 1:1. From a first frame, the video always takes the image’s shape.
- Sound is on by default; set `generate_audio` to `false` for a silent clip at the lower price.
- 720p and 1080p: the higher resolution is a sharper, more detailed render.

## Example

Request body:

```json
{
  "model": "kling-3.0",
  "first_frame": "https://example.com/bakery.jpg",
  "last_frame": "https://example.com/street.jpg",
  "prompt": "The camera glides back from the bakery counter, out through the door and onto the street.",
  "negative_prompt": "text, watermark, blur",
  "seconds": 5,
  "resolution": "720p",
  "generate_audio": false
}
```

## Prompting

- Lead with the subject and what it does, then the camera: “a cyclist crests the hill at sunrise, low tracking shot, then the camera cranes up”.
- Name camera moves plainly: push in, pull back, pan left, orbit, crane up, handheld.
- Use `negative_prompt` for what keeps creeping in, such as text, watermarks or blur.
- From a first frame, describe the motion rather than what’s already in the picture.
- Keep one main action per clip; join longer sequences from several clips.

## Good to know

- Most clips are ready in 2 to 4 minutes; long 1080p clips take longer.
- Prompts or images that may break the content rules can be declined (`content_policy`); declined videos are free.
- Videos are kept for 30 days; download the ones you want to keep.

Full API details: [Video generation](https://zurelay.com/docs/video). Try it in the dashboard’s [Playground](https://zurelay.com/app/playground), which shows the code for each video.