The S&P 500 (^GSPC 0.52%) has more than recovered its losses from earlier this year and is now up nearly 4.4% year to date.Many mega-cap tech-focused companies have posted sizable gains -- including "Magnificent Seven" members Meta Platforms (META 1.04%), Microsoft (MSFT -0.28%), and Nvidia (NVDA 1.74%). But investors may be souring on Tesla (TSLA -0.67%), Apple (AAPL 0.04%), and Alphabet (GOOG 2.30%) (GOOGL 2.70%) due, in part, to their apparent lack of artificial intelligence (AI) achievements.Here's what ...