Sam Altman has supplanted long-time rival Elon Musk as President Donald Trump’s leading private-sector adviser on artificial intelligence, according to a Wall Street Journal report released late Thursday. The article, based on accounts from technology executives and other people familiar with the matter, says Altman built the relationship gradually, attending meetings and offering policy guidance until he emerged as the administration’s preferred AI ally. Musk, who had previously enjoyed direct access to Trump, has seen his influence wane as Altman assumed the informal advisory role.