A young researcher who spent three years at the frontier of artificial intelligence has walked away from Anthropic, offering a rare and unguarded account of what he believes is known inside these organizations but rarely spoken aloud in public. Jacob Coxon, 27, is not the first to leave such a company citing safety concerns, but his departure carries a particular weight: he claims the very people building these systems privately fear they may be building something that ends human civilization, even as they continue to build it. His resignation is less a career decision than a moral statement —