OpenAI closes $6.6 billion funding haul with investment from Microsoft and Nvidia ReutersAmid upheaval, SF tech startup closes whopping $6.6 billion fundraise SFGATEThe Cynic’s Guide to OpenAI’s Megaround The InformationOpenAI Nearly Doubles Valuation to $157 Billion in Funding Round The Wall Street JournalOpenAI is now worth more than 87% of the S&P 500. It faces a tough test ahead. MarketWatch