U.S. stocks slide as OpenAI halt hits AI trade, bond rout deepens

U.S. stocks ended lower on Monday, September 28, 2026, as a halt in OpenAI training weighed on the artificial intelligence trade, while a bond market rout extended. The decline in equities was driven by renewed fears of an AI slowdown, which also impacted Asian chip stocks. Concurrently, a firmer dollar, the bond selloff, and expectations of Federal Reserve rate hikes pushed gold down 4% to below $4,200. These market moves follow strong durable goods and AI spending data that have kept the U.S. growth story running hot. Fed Chair Warsh has delivered a fresh perspective, while analysts note surging bond yields are impacting stocks, gold, and the dollar.