OpenAI has officially closed its latest funding round with $122 billion in committed capital, marking the largest single funding round in Silicon Valley history and cementing the ChatGPT maker's position as the most valuable private AI company in the world. Announced on March 31, 2026, the round values OpenAI at $852 billion post-money, a staggering figure that surpasses the market capitalizations of most S&P 500 companies. The funding was anchored by major investors including SoftBank, NVIDIA, and Amazon, with continued participation from Microsoft and Andreessen Horowitz (a16z). Notably, the round also includes $3 billion from retail investors through a unique structure that allows public market participation ahead of OpenAI's anticipated IPO. The capital infusion comes as the company prepares for a potential blockbuster public offering targeted for Q4 2026, with analysts speculating about a $1 trillion valuation target. Despite the massive funding and growing monthly revenue, OpenAI remains unprofitable, raising questions about the sustainability of the AI investment boom.

Elon Musk has filed a lawsuit against OpenAI and Microsoft, seeking damages between $79 billion and $134 billion. He alleges that OpenAI abandoned its original non-profit mission to benefit humanity after forming a deep partnership with Microsoft for profit, constituting "fraud" and "unjust enrichment" from his foundational contributions. A jury trial is set for April 2026.