What is Runway and what is it used for?
Runway is an AI image and video creation platform built on generative models: the user describes a scene, or starts from an image, to generate clips, and can also transform footage that already exists.
According to the developer models page, Gen-4.5 accepts text and image as input and generates videos of 2 to 10 seconds. Aleph is described as the in-context video editing model, with keyframe-guided control. Act-Two does performance capture: the help center says it costs 5 credits per second, with a 3-second minimum and a duration of up to 30 seconds, on the web version.
Use in the app is metered in credits. Each plan renews a monthly allowance, and each generation spends credits depending on the model used.
The same models reach applications through a developer API, priced per second of generated video.






