Runway: Runway Act-Two API

Runway Act-Two is a next-generation AI motion capture and character animation engine built on the GWM-1 (General World Model) architecture. It specializes in the high-fidelity transfer of a "driving performance" (a video of a real actor) onto a "character reference" (a static image or an existing video). Act-Two excels at capturing micro-expressions, individual finger movements, and complex body physics without the need for traditional mocap suits or specialized hardware. In 2026, it is widely used by indie filmmakers and game developers to create emotionally resonant digital humans and stylized avatars with zero manual rigging or keyframing.

• Input: video
• Output: video
• File input: Supported
• Released: 2025-07-20
• Knowledge cutoff: 2026-01-31