Reactor is a San Francisco startup building real-time AI video generation infrastructure. Founded in August 2025 by CEO Alberto Taiuti and CTO Bryce Schmidtchen, the company focuses on generating video dynamically and continuously rather than rendering finished clips in advance. Its small team includes engineers from Apple, Netflix, Meta, Google, Adobe, Replicate, and Microsoft.
The core technical claim is that Reactor's time to first frame is effectively nil and that generated video can run unbounded, opening the door to interactive and live applications that traditional generative video pipelines cannot support. Reactor exposes this through a unified SDK and API designed so developers can build interactive video experiences with minimal code.
Reactor raised a $59 million Series A led by Lightspeed Venture Partners, with participation from Jeffrey Katzenberg's WndrCo, Amplify Partners, Sky9 Capital, and FPV Ventures. Katzenberg joined as a board observer through WndrCo's investment, signaling strong media-industry interest in real-time generative video.
The company is positioned at the frontier of generative media, where the shift from pre-rendered clips to real-time, interactive video could enable new categories of gaming, live experiences, avatars, and creative tools. Reactor is a developer-platform play, betting that infrastructure for instantaneous AI video will be foundational as interactive use cases mature.