US stocks ended mixed Tuesday, with the Nasdaq 100 rising 0.8% to a record 30,732 as renewed enthusiasm for artificial-intelligence infrastructure lifted chipmakers and related companies. Nvidia gained 0.7%, Micron rose 5% and Sandisk jumped 6.8% after Rosenblatt upgraded the stock. The AI trade received a fresh catalyst from the strong reception for Meta’s Muse AI agent, while Anthropic is releasing a lower-cost AI model designed for a broad range of business tasks ahead of its highly anticipated Wall Street debut. The S&P 500 closed flat after paring earlier losses following President Trump’s statement that US officials had a "very good" meeting with Iranian representatives. The Dow added 185 points, but bank stocks weighed on the index, with JPMorgan down 3.4% and Bank of America falling 3%. Applied Materials rose 1.8%, adding to gains among manufacturers.