# Kling v3 4K Image to Video (`kling_v3_4k_image_to_video`)

> Kling v3 in 4K. Image-to-video, billed per second.

- Capability: Video (tool `video`) — Image to video
- Price: from $1.26 per run (1 credit = $0.01). Exact price for a request: POST https://api.varg.ai/v2/estimate
- Typical time: ~2 min
- JSON Schema: https://api.varg.ai/v2/tools/video?model=kling_v3_4k_image_to_video (public, no key)
- Try it: https://varg.ai/dashboard/tools/playground?model=kling_v3_4k_image_to_video

## Call it

REST: `POST https://api.varg.ai/v2/tools/video/call` with `Authorization: Bearer $VARG_API_KEY` (create a key at https://varg.ai/dashboard/api).
It answers `202` with a job right away. Poll `GET /v2/jobs/{id}` until `status` is `completed`, then read `output.outputs[0].url` — or pass `options.webhook_url` and get the finished job POSTed to you.

```bash
curl -X POST https://api.varg.ai/v2/tools/video/call \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "kling_v3_4k_image_to_video",
  "prompt": "make the cat jump in 4K",
  "files": [
    {
      "url": "https://example.com/cat.png"
    }
  ],
  "duration": 5
}'
```

MCP: the varg server `https://mcp.varg.ai/mcp` (OAuth sign-in, no key) runs it with `call_tool`:

```json
{
  "tool": "video",
  "input": {
    "model": "kling_v3_4k_image_to_video",
    "prompt": "make the cat jump in 4K",
    "files": [
      {
        "url": "https://example.com/cat.png"
      }
    ],
    "duration": 5
  },
  "wait": true
}
```

## Inputs

| field | type | required | default | allowed | description |
|---|---|---|---|---|---|
| `model` | string | yes | — | `kling_v3_4k_image_to_video` or a route key below | Which model runs the job. |
| `prompt` | string | no | — | — | — |
| `files` | array of { url } | no | — | — | — |
| `aspect_ratio` | string | no | — | e.g. 16:9 \| 9:16 \| 1:1 \| 4:3 \| 3:4 \| 21:9 \| auto | — |
| `resolution` | string | no | — | 480p \| 720p \| 1080p \| 4k | Quality tier. Not supported by this model — ignored if sent. |
| `audio` | boolean | no | — | — | Set true to generate the video with a native audio track. |
| `duration` | integer | no | — | 3–15 | Length in seconds. Supported by this model's routes: fal: 3-15. A non-numeric value such as "auto" is routed to a route whose schema accepts it; when none does, the request is rejected. |

Media inputs are URLs. Upload a local file first with `POST /v2/files` and pass the returned URL.

## Provider options

Optional, per provider, under `provider_options.<provider>`. Only the options of the provider that runs the job apply — pin a route to choose it.

### provider_options.fal

| field | type | required | default | allowed | description |
|---|---|---|---|---|---|
| `prompt` | string | no | — | — | — |
| `duration` | string | no | — | 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 11 \| 12 \| 13 \| 14 \| 15 | — |
| `image_url` | string (URL) | no | — | — | — |
| `aspect_ratio` | string | no | — | e.g. 16:9 \| 9:16 \| 1:1 \| 4:3 \| 3:4 \| 21:9 \| auto | — |
| `end_image_url` | string (URL) | no | — | — | — |
| `generate_audio` | boolean | no | — | — | — |

## Routes

`"model": "kling_v3_4k_image_to_video"` picks a route automatically (priority order, then the inputs you send). To pin one, pass its key as `model`.

| model key | provider | modality | price from | typical time |
|---|---|---|---|---|
| `fal:kling_v3_4k_image_to_video/i2v` | fal | image-to-video | $1.26 | ~2 min |

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Catalog version 2026-11-11T12:59:09.901887+00:00. All models: https://varg.ai/models/llms.txt