Jacob Coxon AI researcher whose work focused on pretraining at OpenAI and Anthropic. In 2026 he left the AI industry and publicly raised concerns about the race toward increasingly capable systems.
Jacob Coxon AI researcher whose work focused on pretraining at OpenAI and Anthropic. In 2026 he left the AI industry and publicly raised concerns about the race toward increasingly capable systems.
Career
Member of Technical Staff at OpenAI from 2023 to 2026-07 in San Francisco Bay AreaCosigns Received
Ethan PerezAlignment Team Lead at Anthropic
Jacob was a senior researcher who joined Anthropic in May. My Anthropic colleagues and I had been trying to recruit him for ~2 years, because we knew he was a strong researcher at OpenAI. Before he left, I pitched him to stay and join my team, and I was sad he decided to leave, as are many of my colleagues. 100% agree with him that AI poses serious risks to society, and I'm glad he's speaking out!