SAN FRANCISCO — Jacob Coxon spent three years helping two of the world's most powerful AI labs make their models smarter. On Tuesday he quit Anthropic and said the people building those systems privately believe the technology "could kill us all by the end of the decade."

Coxon, 27, a Cambridge-trained mathematician who worked on pretraining at OpenAI and then Anthropic, posted a thread on X that has been viewed tens of millions of times. "I resigned from Anthropic today," he wrote. "I spent the last three years doing pretraining research at both OpenAI and Anthropic. Neither company is acting responsibly. They are racing straight to self-improving superintelligence and gambling with our lives."

He told colleagues not to underestimate what is coming. "These will soon be superhuman systems that can hack anything, revolutionize any field overnight, and acquire real power and resources. We have all witnessed the progress in each of these domains, and progress is not slowing."

The extinction line is the one that traveled. "The people building AI earnestly believe that it could kill us all by the end of the decade. This is not a marketing stunt. If anything, many executives and senior researchers will couch their phrasing in the press to sound sensible — but I hear the same people express fear privately. No other human activity poses this level of........

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