> ## Documentation Index
> Fetch the complete documentation index at: https://docs.varg.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Kling Legacy

> Previous generation Kling video models — V2.6, V2.5, V2.1, V2

## Overview

These are previous-generation Kling models. While still functional, **Kling V3 is recommended** for new projects. Legacy models may be useful if you need specific features like native audio (V2.6) or motion control.

| Model ID            | Special Features               | Duration      | Credits |
| ------------------- | ------------------------------ | ------------- | ------- |
| `kling-v2.6`        | Native audio, keyframe control | 3-15s         | 150     |
| `kling-v2.6-motion` | Camera trajectory control      | varies        | 150     |
| `kling-v2.5`        | —                              | 5 or 10s only | 100     |
| `kling-v2.1`        | —                              | 5 or 10s      | 100     |
| `kling-v2`          | —                              | 5 or 10s      | 100     |

## Kling V2.6

The most feature-rich legacy model. Supports native audio generation and first+last frame keyframe control.

### Native audio

```bash cURL theme={null}
curl -X POST https://api.varg.ai/v1/video \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kling-v2.6",
    "prompt": "a thunderstorm over a city skyline, lightning flashes",
    "duration": 10,
    "provider_options": { "varg": { "generate_audio": true } }
  }'
```

### Keyframe control

```bash cURL theme={null}
curl -X POST https://api.varg.ai/v1/video \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kling-v2.6",
    "prompt": "smooth transition between scenes",
    "duration": 5,
    "files": [
      { "url": "https://example.com/frame-a.jpg" },
      { "url": "https://example.com/frame-b.jpg" }
    ]
  }'
```

### Motion control

Camera trajectory control for precise camera movements:

```bash cURL theme={null}
curl -X POST https://api.varg.ai/v1/video \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kling-v2.6-motion",
    "prompt": "a park scene with trees and a fountain",
    "duration": 5
  }'
```

## Kling V2.5

<Warning>
  **Duration must be exactly 5 or 10 seconds.** Other values will cause a 422 error.
</Warning>

<CodeGroup>
  ```typescript SDK theme={null}
  const result = await varg.videoModel("kling-v2.5").generate({
    prompt: "a sunset over the ocean, waves gently rolling",
    duration: 5,
  })
  ```

  ```bash cURL theme={null}
  curl -X POST https://api.varg.ai/v1/video \
    -H "Authorization: Bearer $VARG_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "model": "kling-v2.5",
      "prompt": "a sunset over the ocean, waves gently rolling",
      "duration": 5
    }'
  ```
</CodeGroup>

## Migration to Kling V3

If you're using any legacy Kling model, upgrading to Kling V3 is straightforward:

```diff theme={null}
- const result = await varg.videoModel("kling-v2.6").generate({ ... })
+ const result = await varg.videoModel("kling-v3").generate({ ... })
```

Key differences:

* **V3 supports 3-15s** (integer) vs V2.5/V2's 5 or 10s only
* **V3 has better quality** across the board
* **V3 Pro is the same price** as V2.6 (150 credits)
* **V3 Standard** (100 credits) offers similar quality to V2.6 at lower cost

## Related models

<CardGroup cols={2}>
  <Card title="Kling V3" icon="film" href="/models/video/kling-v3">
    Recommended upgrade. Better quality, flexible duration.
  </Card>
</CardGroup>