Reactor has raised a $59 million funding round comprising seed and Series A capital, aimed entirely at democratising access to interactive world models. The massive investment round was led by Lightspeed Venture Partners, with strong institutional backing from a syndicate of notable firms including WndrCo, Amplify Partners, Sky9 Capital, FPV Ventures, and Abstract Ventures.
The size of the raise, which was completed right after the company went public, demonstrates the increasing demand from venture capitalists for fundamental infrastructure that can scale the next frontier of physical AI and generative video.
From Prompts to Living Environments
Until now, the world of generative video has been one of prompts and waits. Existing tools such as OpenAI’s Sora or Runway enable simple inputs of text, followed by a long pause and a static, non-editable video file. These outputs, while artful, are one-shot clips, static and cannot be interacted with.
Reactor is based on a radically different principle: world models. Instead of producing a single line of pixels, a world model creates a long-lasting whole world with its own rules (physics, space, logic, etc.) and not simply a movie to be observed but a place where the user and developer can literally go in and interact with the environment.
Source: Reactor
“World models are redefining what AI can do, moving from systems that generate content in isolation to ones that perceive and respond in real time,” said Alberto Taiuti, co-founder and CEO of Reactor, in the company’s launch statement. “We are building the critical layer between the model labs and the developers who want to create with them. This is about enabling a new form of media, one where experiences that weren’t previously possible are generated live, and anyone can build and distribute them.”
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Pedigree from Apple Vision Pro and Luma AI
The technical mountain Reactor is trying to climb requires rare expertise in spatial computing, real-time rendering, and low-latency systems. Fortunately, the startup’s founding duo possesses exactly that pedigree.
CEO Alberto Taiuti is a prominent figure in the 3D generative space, having previously served as the co-founder and Chief Technology Officer of Luma AI, where he designed the core infrastructure behind some of the market’s most popular 3D and video generation tools. Joining him as Chief Technology Officer is Bryce Schmidtchen. Both Taiuti and Schmidtchen previously worked alongside each other at Apple, where they served as core technical leads developing the Apple Vision Pro spatial computing headset.
Over the past several months, the co-founders have leveraged their network to quietly assemble an elite engineering roster. Reactor’s broader team pulls together researchers and systems experts from top-tier tech and entertainment giants, including Meta, Google, Netflix, Adobe, Microsoft, and Replicate.
The Strategic Ecosystem: Hollywood and AWS
The commercial implications of real-time world generation have already attracted heavy hitters from both entertainment and cloud computing. Veteran media executive Jeffrey Katzenberg, Founding Partner at WndrCo, has joined Reactor as a board observer.
“Every major shift in media has been driven by new tools that expand what creators can do,” Katzenberg noted. “AI is a transformative moment, but the real opportunity lies in making these technologies usable at scale. Reactor is building the platform that can enable a new generation of storytelling and interactive experiences.” The platform has already begun live deployments. Gaming and media studio Overworld is currently utilising Reactor infrastructure to create entirely interactive live entertainment environments.
To run the compute-heavy workloads, Reactor has also announced Amazon Web Services (AWS) as its preferred cloud vendor. The pact will try to heavily reduce the expense of live inference by utilising custom chips and optimised AI services so that running live AI worlds becomes affordable to most application programmers.
