The 1-year return on $SPY is 26%, or 67% better than your GPT-4 return (https://www.google.com/finance/quote/SPY:NYSEARCA?window=1Y). I think you've been fooled by randomness over very short intervals.
I am comparing SPY's return with the GPT return for the exact timeframe during which a particular position was recommended by the GPT Investor. For example, some positions were held for only 7 days, while others were held for 3 months, etc. I generated 19 different sets of recommendations with varied timeframes and at different points in the last year. This link, where I track everything, should clarify any confusion: https://www.gptinvestor.co/the-gpt-investor/