> 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/astra/astra-2.md).

# Astra 2

### Model Overview

**Astra 2** is an advancement in creative diffusion-based upscaling for GenAI video, building on Astra 1 with expanded control over detail generation and stylization. It transforms AI-generated footage by adding new, dynamic detail and texture, with adjustable creativity and sharpness controls and prompt-based guidance for more precise creative direction.

Astra 2 performs best on stylized and GenAI sources, as well as wide shots and large-scale scenes where additional detail can be creatively inferred. It enhances clarity, richness, and visual complexity, and is optimized for expressive, stylized workflows.

### Key Capabilities

* Creatively transform GenAI sources with new detail and textures
* Expanded control with adjustable creativity and sharpness levels, plus prompt-based guidance
* Strong performance on stylized content, wide shots, and detail-sparse scenes

### Pricing

| Frames Per Credit — 1080p | Frames Per Credit — 4k |
| ------------------------- | ---------------------- |
| 10                        | 6                      |

### Getting Started

**Endpoint**

* [https://api.topazlabs.com/video/](<https://api.topazlabs.com/video/&#xA;>)
  * `model` — `"ast-2"`

**Model-Specific Parameters**

* `creativity` — decimal from 0.0 to 1.0, required
* `prompt` — string, optional
* `input_frame_count` — integer, optional; maximum 9000 *without* prompt | 450 *with* prompt
* `input_frame_rate` — integer
* `input_height` — integer
* `input_width` — integer
* `output_height` — integer
* `output_width` — integer
* `realism` — decimal from 0.0 to 1.0, optional
* `sharp` — decimal from 0.0 to 1.0, optional, default 0.5
  * Pre-enhance sharpness (0.0: Gaussian blur, 0.5: passthrough, 1.0: USM sharpening)

### 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="/files/ZA7fCILFSifSNUTO8i2R">/files/ZA7fCILFSifSNUTO8i2R</a></td><td><a href="https://compare.topazlabs.com/share/video?src1=https://downloads.topazlabs.com/web-assets/model-examples/video_12.mp4&#x26;src1label=Before&#x26;src2=https://downloads.topazlabs.com/web-assets/model-examples/video_12_ast2_C4_S3.mp4&#x26;src2label=After&#x26;zoom=1.0">https://compare.topazlabs.com/share/video?src1=https://downloads.topazlabs.com/web-assets/model-examples/video_12.mp4&#x26;src1label=Before&#x26;src2=https://downloads.topazlabs.com/web-assets/model-examples/video_12_ast2_C4_S3.mp4&#x26;src2label=After&#x26;zoom=1.0</a></td></tr><tr><td align="center">Click to view</td><td><a href="/files/pvbzlmg4fPTQWf4ZID6k">/files/pvbzlmg4fPTQWf4ZID6k</a></td><td><a href="https://compare.topazlabs.com/share/video?src1=https://downloads.topazlabs.com/web-assets/model-examples/video_15.mp4&#x26;src1label=Before&#x26;src2=https://downloads.topazlabs.com/web-assets/model-examples/video_15_ast2_C4_S3.mp4&#x26;src2label=After&#x26;zoom=1.0">https://compare.topazlabs.com/share/video?src1=https://downloads.topazlabs.com/web-assets/model-examples/video_15.mp4&#x26;src1label=Before&#x26;src2=https://downloads.topazlabs.com/web-assets/model-examples/video_15_ast2_C4_S3.mp4&#x26;src2label=After&#x26;zoom=1.0</a></td></tr><tr><td align="center">Click to view</td><td><a href="/files/cWOxhqdMzMR4vVjftyhk">/files/cWOxhqdMzMR4vVjftyhk</a></td><td><a href="https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo_18.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo_18_ast2_C4_S3.mp4&#x26;src2label=After&#x26;zoom=1.0">https://compare.topazlabs.com/share/video?src1=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo_18.mp4&#x26;src1label=Before&#x26;src2=https%3A%2F%2Fdownloads.topazlabs.com%2Fweb-assets%2Fmodel-examples%2Fvideo_18_ast2_C4_S3.mp4&#x26;src2label=After&#x26;zoom=1.0</a></td></tr></tbody></table>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://developer.topazlabs.com/video-models/astra/astra-2.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.