Reactor raises total $74 million with Nvidia backing

The investment lands as world models draw growing attention and investment, with expectations that AI will move beyond screens into cars, robots and other objects. Within just the last week, AMD announced plans to acquire World Labs for $8.2 billion in stock and video AI startup Runway unveiled the first open-weight version of its world model. Reactor's bet is that, just as generative AI spawned an industry to train and run LLMs, world models will need their own infrastructure layer.

Reactor emerged from stealth in May and develops software to make world models run faster and cheaper while selling a cloud service that manages computing capacity. Its founders, Alberto Taiuti and Bryce Schmidtchen, both previously worked on Apple's Vision Pro, and Taiuti co-founded AI video generator startup Luma AI. Reactor says Hollywood studios, advertising platforms and streaming services have active projects on the platform, but the company sees robots as a major area of focus. Taiuti said building conventional simulations for robot testing can be time-consuming and costly, requiring developers to create three-dimensional objects and configure scenes, while world models could reduce that work by generating environments from prompts. Running models in the cloud gives developers access to more computing power without adding hardware to each robot and lets them upgrade the computers running the models without replacing hardware across a fleet.

Nvidia, which invested via its NVentures VC arm, has developed its own Cosmos world models, alongside Isaac tools for robot simulation and Jetson computers that run AI on robots. The outcome for Reactor is likely to hinge on whether its claim that similar models and workloads can run on the same core engine holds up in robotics, and on whether robot developers adopt generated environments over conventional simulation. For Nvidia, the stake extends its position across the infrastructure that runs interactive models, not just the hardware those models run on.