In November 2025, Anthropic, known to its employees as Ant, trained a model called Claude Opus 4.5 on warehouses of liquid-cooled processors, and on the day the worker ants released it, machines became agentic. That is to say, they no longer needed handholding. Before November, the machines had felt like eight-year-olds: eager, literal-minded, completing your sentences, getting it nearly ...