Runway ML

This page is auto-generated from model configurations. Last updated: 2026-06-15.

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 Aleph 2
• 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 Aleph 2

Edit any video using a text prompt, with optional reference images pinned to specific moments for precise, frame-level control.

Model ID: model_runway-aleph-2

Capabilities: video2video

LLM Markdown: https://app.scenario.com/api/models/model_runway-aleph-2/markdown

Parameter	Type	Required	Default	Min	Max	Allowed Values	Description
prompt	string	Yes	-	-	-	-	Describe how you want the video to look or feel after editing — style, atmosphere, visual changes. For example: ‘transform into a noir film with high contrast and rain-soaked streets’.
video	file	Yes	-	-	-	-	The source video to edit. Maximum 30 seconds and 16 MB. The model rewrites its visuals based on your prompt while preserving the original motion and structure.
keyframes	inputs_array	No	-	-	-	-	Pin reference images to specific moments in the video to guide the edit at those points. Add up to 5 keyframes. Use Seconds or Position to set each one’s timing.
promptImage	inputs_array	No	-	-	-	-	Alternative to Keyframes — pin reference images to moments in the output video. Cannot be used together with Keyframes. Add up to 5 images.
seed	number	No	-	0	4294967295	-	A number that locks in the randomness of the generation. Copy the seed from a result you liked to reproduce it exactly, or leave blank for a new result each time.

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.