JPMorgan's AI agents beat 60/40 portfolios in backtests—but critical details are missing

Eight AI agents outperformed a traditional 60/40 portfolio in JPMorgan's historical backtests, according to reports published July 10, 2026. But the bank hasn't disclosed out-of-sample validation, transaction costs, turnover, or risk-adjusted metrics like Sharpe ratio. Without these details, the results could reflect curve-fitting rather than genuine forward-looking advantage. For institutional allocators, the distinction matters: beating a static benchmark in hindsight is a low bar.