U.S. stocks experienced a downturn on Tuesday, with the S&P 500 falling by 34.81 points (0.49%) to close at 7,139.10 and the Nasdaq Composite dropping 222.37 points (0.89%) to end at 24,664.73. The decline was largely attributed to renewed concerns regarding the artificial intelligence sector, particularly after OpenAI reportedly missed internal targets for users and revenue, raising questions about its spending capabilities. As major tech firms prepare to announce their quarterly results, investors are cautious, especially with five of the 'Magnificent Seven' AI-related companies set to report this week, which collectively account for about 44% of the S&P 500's market capitalization. Meanwhile, General Motors saw its shares rise after exceeding profit estimates and updating its earnings forecast, while United Parcel Service's shares fell due to reaffirmed revenue targets amid rising fuel costs. The Federal Reserve's upcoming meeting is also in focus, as analysts speculate on the potential for interest rate changes in response to inflation driven by soaring crude oil prices, particularly in light of geopolitical tensions.