Gen-3 Alpha is the first in a new series of foundation models from Runway, designed to generate high-quality video clips with significant improvements in generation speed, fidelity, and control. It specializes in creating expressive human characters with a wide range of actions and emotions, ensures temporal consistency in scenes, and offers fine-grained control over structure, style, and motion. Built on a new infrastructure for large-scale multimodal training, Gen-3 Alpha powers Runway's Text-to-Video, Image-to-Video, and upcoming tools like Motion Brush and Director Mode.