---
title: Runway ML | Scenario Docs
---

> This page is auto-generated from model configurations. Last updated: 2026-04-09.

This reference lists all available **Runway ML** video generation models and their parameters. Use these parameter names when calling the [Generation API](/api/postgeneratecustom/index.md).

- [Runway Aleph](#runway-aleph)
- [Runway Gen4 Turbo](#runway-gen4-turbo)
- [Runway Gen4.5](#runway-gen45)

---

## Runway Aleph

**Model ID:** `model_runway-gen4-aleph`

**Capabilities:** `video2video`

**LLM Markdown:** <https://app.scenario.com/api/models/model_runway-gen4-aleph/markdown>

| Parameter         | Type        | Required | Default | Min | Max | Allowed Values | Description                                                                                           |
| ----------------- | ----------- | -------- | ------- | --- | --- | -------------- | ----------------------------------------------------------------------------------------------------- |
| `prompt`          | string      | Yes      | -       | -   | -   | -              | Text prompt for video generation                                                                      |
| `video`           | file        | Yes      | -       | -   | -   | -              | Input video to generate from. Videos must be less than 16MB. Only 5s of the input video will be used. |
| `referenceImages` | file\_array | No       | -       | -   | -   | -              | Up to 3 reference images to influence the style or content of the output.                             |
| `seed`            | number      | No       | -       | -   | -   | -              | Use a seed for reproducible results. Leave blank to use a random seed.                                |

## Runway Gen4 Turbo

The Turbo version of Gen-4 delivers further enhanced speeds at a lower cost, and is a powerful model for quickly iterating ideas.

**Model ID:** `model_runway-gen4-turbo`

**Capabilities:** `img2video`

**LLM Markdown:** <https://app.scenario.com/api/models/model_runway-gen4-turbo/markdown>

| Parameter     | Type   | Required | Default    | Min | Max | Allowed Values                                                        | Description                                                            |
| ------------- | ------ | -------- | ---------- | --- | --- | --------------------------------------------------------------------- | ---------------------------------------------------------------------- |
| `prompt`      | string | Yes      | -          | -   | -   | -                                                                     | Describe your video                                                    |
| `image`       | file   | Yes      | -          | -   | -   | -                                                                     | Image used as the first frame of the video.                            |
| `aspectRatio` | string | No       | `1280:720` | -   | -   | `1584:672`, `1280:720`, `1104:832`, `960:960`, `832:1104`, `720:1280` | Aspect ratio of the video. Ignored if first frame is provided.         |
| `duration`    | number | No       | `5`        | 2   | 10  | -                                                                     | Duration in seconds                                                    |
| `seed`        | number | No       | -          | -   | -   | -                                                                     | Use a seed for reproducible results. Leave blank to use a random seed. |

## Runway Gen4.5

Gen-4.5 is state-of-the-art and sets a new standard for video generation motion quality, prompt adherence and visual fidelity.

**Model ID:** `model_runway-gen4-5`

**Capabilities:** `txt2video`, `img2video`

**LLM Markdown:** <https://app.scenario.com/api/models/model_runway-gen4-5/markdown>

| Parameter     | Type   | Required | Default    | Min | Max        | Allowed Values                                                                    | Description                                                                                                         |
| ------------- | ------ | -------- | ---------- | --- | ---------- | --------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------- |
| `prompt`      | string | Yes      | -          | -   | -          | -                                                                                 | Describe your video                                                                                                 |
| `image`       | file   | No       | -          | -   | -          | -                                                                                 | Image used as the first frame of the video.                                                                         |
| `aspectRatio` | string | No       | `1280:720` | -   | -          | `1584:672`, `1280:720`, `1104:832`, `960:960`, `832:1104`, `720:1280`, `672:1584` | Aspect ratio of the video. Ignored if first frame is provided. For Text to Video, only 16:9 and 9:16 are supported. |
| `duration`    | number | No       | `5`        | 2   | 10         | -                                                                                 | Duration in seconds                                                                                                 |
| `seed`        | number | No       | -          | 0   | 4294967295 | -                                                                                 | Use a seed for reproducible results. Leave blank to use a random seed.                                              |