Five years ago, a group of researchers walked out of OpenAI over safety concerns to build a quiet rival named Claude — and after a historic $65 billion funding round that valued the company at $965 billion, those ex-employees have officially leapfrogged their former bosses to create the most valuable AI startup on Earth (opens in new tab)

In early 2021, a small group of senior researchers walked out of OpenAI’s San Francisco offices for the last time. They were not junior staff. Dario Amodei had been OpenAI’s Vice President of Research. His sister Daniela had run the company’s policy and safety teams. Around them were several of OpenAI’s most senior scientists. They […]