“Officials at multiple federal agencies have raised concerns about the safety and reliability of Elon Musk’s xAI artificial-intelligence tools in recent months, highlighting continuing disagreements within the U.S. government about which AI models to deploy,” the Wall Street Journal reports.“The warnings preceded the Pentagon’s decision this week to put xAI at the center of some of the nation’s most sensitive and secretive operations by agreeing to allow its chatbot Grok to be used in classified settings.”