Runway ML

This page is auto-generated from model configurations. Last updated: 2026-03-13.

This reference lists all available Runway ML video generation models and their parameters. Use these parameter names when calling the Generation API.

Runway Aleph
Runway Gen4 Turbo
Runway Gen4.5

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.