Apple’s AI ambitions face a defining crisis as longtime AI chief John Giannandrea has stepped down, seven years after being hired to reinvent Siri and lead the company into a new era of intelligence. His departure exposes deeper troubles inside Apple, which has fallen behind rivals like Google and Microsoft in generative AI and delayed major updates to its Apple Intelligence platform. Insiders describe structural dysfunction, internal clashes with Tim Cook, and a massive talent exodus, with most top researchers leaving for competitors. Apple is now scrambling to rebuild under new AI chief Amar Subramanya as leadership uncertainty and mounting pressure intensify.