President Donald Trump rejected joint artificial-intelligence development with China at a summit on September 26, saying the United States is leading by too wide a margin to risk diluting its advantage. Trump estimated the U.S. lead at least one year, while some assessments place it closer to two years. The countries agreed to establish a U.S.-China Super Intelligence (SI) Dialogue before November 2026 to discuss the risks and benefits of advanced AI systems, and created a bilateral channel for managing AI and superintelligence-related incidents. The summit produced no agreement on joint AI development, shared regulatory frameworks or technology transfers. The arrangement reflects a broader U.S.-China technology rivalry shaped by American semiconductor export restrictions and allegations that Chinese AI companies have copied or reverse-engineered U.S. models. While some technology executives and international organizations support regulatory cooperation because advanced AI risks cross borders, the administration favors limiting collaboration to avoid giving China a shortcut to capabilities. The SI Dialogue leaves a limited mechanism for handling incidents that create shared risks, and traders and investors are advised to monitor how it operates before its planned launch.