OpenAI has reportedly reached a valuation of $500 billion, overtaking Elon Musk‘s rocket company SpaceX to become the world’s largest startup.Current and former employees of the company behind ChatGPT sold about$6.6 billion worth of shares to investors, including Softbank Group, Thrive Capital, Dragoneer Investment Group, Abu Dhabi’s MGX, and T. Rowe Price, according to media reports on Thursday. The company had authorized sales of $10-billion-plus worth of stock on the secondary market, Reuters reported.T ...