# KwaiVGI Kling O3 4K Text to Video API

> Kling O3 4K Text to Video by Kuaishou turns a text prompt into a 3-15 second native 4K video with optional native audio.

Source: https://www.sandbase.ai/model/kwaivgi/kling-video/o3/4k/text-to-video
API reference: https://www.sandbase.ai/model/kwaivgi/kling-video/o3/4k/text-to-video/docs

## Facts

- Provider: KwaiVGI
- Type: Video model
- Model ID: `kwaivgi/kling-video/o3/4k/text-to-video`
- Price: From $1.47 per run (30% off list price)
- Capabilities: text to video
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Unified Run API: `POST https://api.sandbase.ai/v1/run`

```bash
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "kwaivgi/kling-video/o3/4k/text-to-video",
  "prompt": "A mecha lands on the ground to save the city, and says \"I'"'"'m here\", in anime style",
  "duration": 5,
  "shot_type": "customize",
  "aspect_ratio": "16:9",
  "generate_audio": false
}'
```

The response returns a run id; poll `GET https://api.sandbase.ai/v1/run/{id}` until the status is `completed` or `failed`.

## FAQ

### How do I call KwaiVGI Kling O3 4K Text to Video through SandBase?

Create a SandBase API key, then send requests with the model ID "kwaivgi/kling-video/o3/4k/text-to-video" to Unified Run API (/v1/run) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### Do I need a separate KwaiVGI account?

No. One SandBase API key and balance gives you access to KwaiVGI Kling O3 4K Text to Video and the other models in the catalog; you do not need to sign up with KwaiVGI separately.

## README

### Kling O3 4K Text to Video

Kling O3 4K text-to-video, native 4K output in one pass, without a separate upscale. Write a scene, optionally split into shots with `multi_prompt`, and get back a 3–15 second clip.

#### Fields

| Field | Type | Default | Notes |
|---|---|---|---|
| `prompt` | string, required | — | Up to 2,500 characters. |
| `aspect_ratio` | `16:9` / `9:16` / `1:1` | `16:9` | Output frame shape. |
| `duration` | 3–15 | 5 | Output length in seconds. |
| `generate_audio` | boolean | false | Generate native audio with the clip. |
| `multi_prompt` | object[] | — | Optional list of shots, each with its own prompt and duration. |
| `shot_type` | `customize` / `intelligent` | `customize` | `customize` follows your `multi_prompt` shot list; `intelligent` lets the model plan the cuts. |

#### Billing

You pay $0.42 per output second, with or without audio.

| Output | Price |
|---|---|
| 3s | $1.26 |
| 5s (default) | $2.10 |
| 10s | $4.20 |
| 15s | $6.30 |

Failed runs are not charged.

#### Prompting

- Describe subject, action, camera move, and light in order.
- For several shots, use `multi_prompt` with one entry per shot.

#### Limits

- Clips are 3–15 seconds.

#### Also on SandBase

Other Kling O3 4K endpoints and tiers: `kwaivgi/kling-video/o3/4k/image-to-video`, `kwaivgi/kling-video/o3/4k/reference-to-video`, `kwaivgi/kling-video/o3/4k/edit`, `kwaivgi/kling-video/o3/4k/video-to-video`, `kwaivgi/kling-video/o3/standard/text-to-video`, `kwaivgi/kling-video/o3/pro/text-to-video`.