Tesla's second-quarter revenue soared, investing $5.8 billion in the AI and robotics field. The company's stock price fell over 4% after hours.

In order to focus on the future driven by AI and robotics technology, Tesla's spending in the second quarter increased to $5.8 billion, leading to its free cash flow turning negative for the first time in two years, despite a significant increase in revenue for the quarter. "This year is a big year for capital expenditures, but I believe that all of the projects we are investing in will generate incredible returns," CEO Elon Musk told investors on a conference call on Wednesday. Despite Musk's confidence, Tesla's stock price still dropped over 4% in after-hours trading on Wednesday. The financial report shows that Tesla's free cash flow was negative $1.1 billion in the second quarter, with a 5% decrease in net profit. The company's earnings per share for the quarter were 33 cents, lower than Wall Street's expectations. Overall, Tesla's revenue for the quarter increased to $28 billion, a 26% increase compared to the same period last year. Despite facing the dual challenges of weak demand in the United States and increased competition, the core automotive business revenue still increased by 23% year-on-year.