In the long arc of computing, intelligence has always migrated closer to the human hand — from mainframes to desktops to pockets. PrismML's Bonsai model, a 27-billion-parameter AI compressed to 3.9 gigabytes and capable of running free on an iPhone 17 Pro, marks another step in that migration, arriving at a moment when Apple's silicon is ready but its software ambitions remain unresolved. The release quietly challenges the assumption that serious AI requires a subscription and a distant server, and it places Apple at a crossroads between its identity as a hardware company and its aspirations i