From Santa Monica, Rabbit has released OS3, a cloud-based operating system that places AI agents in direct command of up to five personal devices at once. The system marks a quiet but consequential threshold in human-computer relations: rather than tools that assist, OS3 is designed to act — receiving a stated goal and independently choosing how and where to execute it. As with many such crossings, the convenience is immediate and the implications arrive more slowly, carried in the fine print of data flows, unspecified guardrails, and skills installed without review.