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

# Kling Extend 3.0 — Extend Video

> Extend an existing video using Kling Extend 3.0 via PixelByte API

Continue an existing video by generating new footage that follows on from the source clip with Kling Extend 3.0. Supports std/pro quality tiers and 5- or 10-second extensions.

| Property            | Value                                  |
| ------------------- | -------------------------------------- |
| **Provider**        | Kling                                  |
| **Model**           | Kling Extend 3.0                       |
| **Capability**      | Extend Video                           |
| **Base Cost**       | 70,000 micro-cents/second (\$0.07/sec) |
| **Processing Time** | \~240 seconds                          |

## Request Body

<ParamField body="model" type="string" required placeholder="kling/kling-extend-v3/extend-video">
  Model slug. Use `kling/kling-extend-v3/extend-video`.
</ParamField>

<ParamField body="input" type="object" required>
  Input parameters for video extension.

  <Expandable title="properties" defaultOpen>
    <ParamField body="video_url" type="string" required>
      URL of the source video to extend.
    </ParamField>

    <ParamField body="work_id" type="string">
      Optional identifier of an existing Kling work to extend.
    </ParamField>

    <ParamField body="prompt" type="string">
      Text description guiding the extension (max 2500 characters).
    </ParamField>

    <ParamField body="negative_prompt" type="string">
      Text describing content to avoid (max 1000 characters).
    </ParamField>

    <ParamField body="quality" type="string">
      Generation quality. Default: `std`. Options: `std`, `pro`.
    </ParamField>

    <ParamField body="duration" type="string">
      Extension duration in seconds. Default: `5`. Options: `5`, `10`.
    </ParamField>
  </Expandable>
</ParamField>

<ParamField body="webhookUrl" type="string">
  HTTPS URL to receive a webhook notification when the job completes or fails.
</ParamField>

## Pricing

**Base cost:** 70,000 micro-cents per second (\$0.07/sec)

```
finalCost = baseCost × duration × quality
```

| Factor       | Option | Multiplier |
| ------------ | ------ | ---------- |
| **Duration** | `5`    | 5x         |
|              | `10`   | 10x        |
| **Quality**  | `std`  | 1x         |
|              | `pro`  | 1.5x       |

<Tip>
  **Default cost:** 5 seconds, std quality = 70,000 × 5 × 1 = **350,000 micro-cents (\$0.35)**
</Tip>

## Response

<ResponseField name="jobId" type="string">
  Unique identifier for the submitted job.
</ResponseField>

<ResponseField name="status" type="string">
  Initial job status. Always `"pending"` on successful submission.
</ResponseField>

<ResponseField name="estimatedCompletionTime" type="string">
  ISO 8601 timestamp of the estimated completion time.
</ResponseField>

<ResponseField name="costMicroCents" type="number">
  The cost of the job in micro-cents.
</ResponseField>

## Code Examples

<CodeGroup>
  ```bash cURL theme={null}
  curl -X POST https://api.muvi.video/v1/jobs/submit \
    -H "Authorization: Bearer $PIXELBYTE_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "model": "kling/kling-extend-v3/extend-video",
      "input": {
        "video_url": "https://example.com/video.mp4",
        "prompt": "The character keeps walking forward into the open square",
        "quality": "std",
        "duration": "5"
      }
    }'
  ```

  ```python Python theme={null}
  import requests

  response = requests.post(
      "https://api.muvi.video/v1/jobs/submit",
      headers={
          "Authorization": "Bearer YOUR_API_KEY",
          "Content-Type": "application/json"
      },
      json={
          "model": "kling/kling-extend-v3/extend-video",
          "input": {
              "video_url": "https://example.com/video.mp4",
              "prompt": "The character keeps walking forward into the open square",
              "quality": "std",
              "duration": "5"
          }
      }
  )

  data = response.json()
  print(data)
  ```

  ```javascript JavaScript theme={null}
  const response = await fetch("https://api.muvi.video/v1/jobs/submit", {
    method: "POST",
    headers: {
      "Authorization": "Bearer YOUR_API_KEY",
      "Content-Type": "application/json"
    },
    body: JSON.stringify({
      model: "kling/kling-extend-v3/extend-video",
      input: {
        video_url: "https://example.com/video.mp4",
        prompt: "The character keeps walking forward into the open square",
        quality: "std",
        duration: "5"
      }
    })
  });

  const data = await response.json();
  console.log(data);
  ```
</CodeGroup>