# Starlight Fast 2

### Model Overview

**Starlight Fast 2** is a second generation diffusion-based video enhancement model designed for improved speed and quality. It delivers significantly faster results than Fast 1 while producing more realistic outputs and sharper details.

Fast 2 balances performance and quality, making it well suited for high volume processing, rapid turnaround workflows, and scenarios where speed is critical but visual fidelity still matters.

### Key Capabilities

* Up to 2× faster performance compared to Starlight Fast 1
* Produces more realistic results and sharper detail than previous model
* Ideal for high volume and time sensitive workflows that require speed with improved quality

### Pricing

| Frames Per Credit — 1080p | Frames Per Credit — 4k |
| ------------------------- | ---------------------- |
| \~52                      | \~24                   |

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For more accurate estimates we recommend checking out our [Credit Calculator](https://developer.topazlabs.com/credit/calculator).
{% endhint %}

### Getting Started

**Endpoint**

* <https://api.topazlabs.com/video/>
  * `model` — `"slf-2"`

**Model-Specific Parameters**

* `input_frame_count` — integer, optional; maximum 9000
* `start_idx` — integer, default 0
* `end_idx` — decimal, default 1000000.0
* `upscaling_factor` — decimal, default 1.0
* `low_sharpness` — boolean, default false
* `keep_original` — boolean, default false
* `ffmpeg_encoding` — string, optional
* `wm_path` — string, optional
* `ffmpeg_preproc_filters` — string, default `""`

### Examples

<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%2FtJ6UpzLD7BqYlDHmG2Xi%2FStarlight_Fast_2_slider.jpg?alt=media&#x26;token=fb24656a-3977-46d4-a8bb-e2e95de7ed9e">Starlight_Fast_2_slider.jpg</a></td><td><a href="https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2FWorldsFair0001-before.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2FWorldsFair0001-before_Precise_Starlight_Fast_2.mp4&#x26;src2label=After&#x26;zoom=1">https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2FWorldsFair0001-before.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2FWorldsFair0001-before_Precise_Starlight_Fast_2.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%2FAIAo6hVxXq2t86eS3FrK%2FStarlight_Fast_2_-_6429487_Woodpecker_Bird_Autumn_Telephoto_By_Edwin_Haighton_Artlist_4K_slider.jpg?alt=media&#x26;token=1936fc48-a0ab-4330-a1e3-a9faa4deff61">Starlight_Fast_2_-_6429487_Woodpecker_Bird_Autumn_Telephoto_By_Edwin_Haighton_Artlist_4K_slider.jpg</a></td><td><a href="https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2F6429487_Woodpecker%20Bird%20Autumn%20Telephoto_By_Edwin_Haighton_Artlist_4K.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2F6429487_Woodpecker%20Bird%20Autumn%20Telephoto_By_Edwin_Haighton_Artlist_4K_slf.mp4&#x26;src2label=Starlight%20Fast%202&#x26;zoom=1">https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2F6429487_Woodpecker%20Bird%20Autumn%20Telephoto_By_Edwin_Haighton_Artlist_4K.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2F6429487_Woodpecker%20Bird%20Autumn%20Telephoto_By_Edwin_Haighton_Artlist_4K_slf.mp4&#x26;src2label=Starlight%20Fast%202&#x26;zoom=1</a></td></tr></tbody></table>