Meet Jacob Coxon, Ex-Anthropic Researcher Who Sparked A Debate On AI Safety
Jacob Coxon, who graduated from Cambridge in 2020, led to a debate with his warning about how AI labs were "gambling" with the lives of people.
Jacob Coxon, a 27-year-old researcher at OpenAI and Anthropic, resigned from his positions at both AI labs in September 2026, igniting a fierce debate around the speed and safety of AI development. Rather than announcing a major breakthrough, Coxon accused both companies of recklessly racing toward self-improving superintelligence, a gamble he claimed could spell human extinction.
His resignation thread on X, written from a San Francisco park bench, quickly went viral, prompting senior researchers at rival labs to voice their own concerns over the pace of AI advancement. Despite spending his career training AI models, Coxon's resignation did not come as a surprise to many in the field. Both OpenAI and Anthropic credit Coxon as a key contributor to their most advanced models, including GPT-4o and Claude.
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