> For the complete documentation index, see [llms.txt](https://developer.topazlabs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.topazlabs.com/video-models/upscaling-and-enhancement/generative/starlight-fast-3.md).

# Starlight Fast 3

Fastest Starlight model yet, accelerating precise diffusion upscaling without sacrificing quality.

<table data-card-size="large" data-view="cards"><thead><tr><th align="center"></th><th data-hidden data-card-cover data-type="image">Cover image</th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td align="center">Click to view</td><td><a href="https://4007072434-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FJkSwaYgAsTQke14gpXAF%2Fuploads%2FWxbaubRraS4eiZeGo6Ws%2Fvideo19-seedance1.5pro-slf3_slider.jpg?alt=media&#x26;token=29661a0b-3eb0-482d-9ac9-68ba0f89d114">https://4007072434-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FJkSwaYgAsTQke14gpXAF%2Fuploads%2FWxbaubRraS4eiZeGo6Ws%2Fvideo19-seedance1.5pro-slf3_slider.jpg?alt=media&#x26;token=29661a0b-3eb0-482d-9ac9-68ba0f89d114</a></td><td><a href="https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo19-seedance1.5pro-slf3-before.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo19-seedance1.5pro-slf3-after.mp4&#x26;src2label=After&#x26;zoom=1">https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo19-seedance1.5pro-slf3-before.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo19-seedance1.5pro-slf3-after.mp4&#x26;src2label=After&#x26;zoom=1</a></td></tr><tr><td align="center">Click to view</td><td><a href="https://4007072434-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FJkSwaYgAsTQke14gpXAF%2Fuploads%2FhxWFJeMOwMkmJru8RSLm%2Fvideo38-veo3.1-slf3_slider.jpg?alt=media&#x26;token=cda9be1f-8eed-48f1-97d2-125bce17275d">https://4007072434-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FJkSwaYgAsTQke14gpXAF%2Fuploads%2FhxWFJeMOwMkmJru8RSLm%2Fvideo38-veo3.1-slf3_slider.jpg?alt=media&#x26;token=cda9be1f-8eed-48f1-97d2-125bce17275d</a></td><td><a href="https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo38-veo3.1-slf3-before.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo38-veo3.1-slf3-after.mp4&#x26;src2label=After&#x26;zoom=1">https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo38-veo3.1-slf3-before.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo38-veo3.1-slf3-after.mp4&#x26;src2label=After&#x26;zoom=1</a></td></tr></tbody></table>

### Model Overview

Starlight Fast 3 is the next generation of the Starlight Fast line, a diffusion video enhancement model built for faster iteration and deadline-driven workflows. Designed to upscale and enhance both GenAI and archival sources, it delivers up to 4× the processing speed of Starlight Precise 2.6 while achieving comparable high-quality results.

At 1080p output, Starlight Fast 3 can render up to 7 frames per second, completing a 10-second clip in under 40 seconds. It also uses scene splitting, automatically detecting cuts within a video clip to improve temporal stability and consistency at scene changes.

### Best Use Cases

* **High-volume generative work.** Starlight-class results at scale.
* **Deadlines.** Faster turnaround.
* **GenAI video.** Natural detail with quicker processing.
* **Previews.** Check generative results before a Precise 2.6 pass.
* **Large libraries.** Process big catalogs efficiently.

### Endpoint

`https://api.topazlabs.com/video/`

`https://api.topazlabs.com/video/express`

### Model Parameters

Model parameters go inside the filter object in `filters`.

| Parameter | Type     | Required / Default | Accepted values | Description |
| --------- | -------- | ------------------ | --------------- | ----------- |
| `model`   | `string` | Required           | `"slf-3"`       | —           |

Starlight Fast 3 has no model-specific parameters.

For request parameters shared by every video model (source, output, destination, and notifications), see Request Parameters. The full schema is also available in our API Reference page.

### Model Pricing

**Starlight Fast 3** is priced per output frame. Credits = ceil(output frames ÷ frames per credit).

| Output resolution | Frames per credit |
| ----------------- | ----------------- |
| 1080p             | 26.0417           |
| 4K                | 11.9179           |

#### 1080p Output

| Duration | 24 fps | 30 fps | 60 fps |
| -------- | ------ | ------ | ------ |
| 5 s      | 5      | 6      | 12     |
| 10 s     | 10     | 12     | 24     |
| 30 s     | 28     | 35     | 70     |
| 1 min    | 56     | 70     | 139    |
| 5 min    | 277    | 346    | 692    |
| 10 min   | 553    | 692    | 1383   |

#### 4K Output

| Duration | 24 fps | 30 fps | 60 fps |
| -------- | ------ | ------ | ------ |
| 5 s      | 11     | 13     | 26     |
| 10 s     | 21     | 26     | 51     |
| 30 s     | 61     | 76     | 152    |
| 1 min    | 121    | 152    | 303    |
| 5 min    | 605    | 756    | 1511   |
| 10 min   | 1209   | 1511   | 3021   |

{% hint style="info" %}
These are estimates. For a quote on a specific file, use our [Credit Calculator](https://developer.topazlabs.com/credit-calculator) or create the request with `POST /video/`, which returns an estimate before processing starts.
{% endhint %}

### Example Request

{% tabs %}
{% tab title="cURL" %}

```bash
curl -X POST "https://api.topazlabs.com/video/express" \
  -H "X-API-Key: $TOPAZ_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "source": { "container": "mp4" },
    "filters": [ { "model": "slf-3" } ],
    "output": { "resolution": { "width": 3840, "height": 2160 } }
  }'
```

{% endtab %}

{% tab title="JavaScript" %}

```javascript
const payload = {
  "source": {
    "container": "mp4"
  },
  "filters": [
    {
      "model": "slf-3"
    }
  ],
  "output": {
    "resolution": {
      "width": 3840,
      "height": 2160
    }
  }
};

const response = await fetch("https://api.topazlabs.com/video/express", {
  method: 'POST',
  headers: {
    'X-API-Key': process.env.TOPAZ_API_KEY,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify(payload),
});

if (!response.ok) {
  throw new Error(`Request failed: ${response.status} ${await response.text()}`);
}

console.log(await response.json());
```

{% endtab %}

{% tab title="Python" %}

```python
import os
import requests

payload = {'source': {'container': 'mp4'},
 'filters': [{'model': 'slf-3'}],
 'output': {'resolution': {'width': 3840, 'height': 2160}}}

response = requests.post(
    "https://api.topazlabs.com/video/express",
    headers={"X-API-Key": os.environ["TOPAZ_API_KEY"]},
    json=payload,
)
response.raise_for_status()
print(response.json())
```

{% endtab %}
{% endtabs %}

### Helpful Resources

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><i class="fa-play">:play:</i></td><td><h4>Video Quickstart</h4></td><td>Quickly get started with our Video API.</td><td><a href="/getting-started/video-quickstart.md">Video Quickstart</a></td></tr><tr><td><i class="fa-file-brackets-curly">:file-brackets-curly:</i></td><td><h4>API Reference</h4></td><td>View our API reference to view the entire schema.</td><td><a href="https://app.gitbook.com/o/HctdcUHRfIWXBVA1egPp/s/dQjJSfrAUC693PLetlIA/">Reference</a></td></tr><tr><td><i class="fa-square-root-variable">:square-root-variable:</i></td><td><h4>Model Pricing</h4></td><td>Learn how we price our models.</td><td><a href="/getting-started/model-pricing.md">Model Pricing</a></td></tr></tbody></table>


---

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