OpenAI is exploring a secondary stock sale that could value the company at $500 billion, up from $300 billion earlier this year. This move would allow employees to cash out equity amid intense talent competition in the AI sector. The valuation surge is driven by impressive growth metrics: 700 million weekly ChatGPT users, $13 billion in annual recurring revenue, and a business subscriber base that grew from three to five million recently. Despite projecting substantial losses, OpenAI's rapid expansion continues to attract major investors as the company builds extensive AI infrastructure and competes with tech giants making multi-billion dollar AI investments.