Opinion: OpenAI is now worth more than 87% of S&P 500 companies. It faces a tough test ahead. MarketWatchAmid upheaval, SF tech startup closes whopping $6.6 billion fundraise SFGATEOpenAI Raises $6.6 Billion at $157 Billion Valuation BloombergOpenAI gets $6.6 billion in new funding, valuing company at $157 billion The Washington PostOpenAI closes funding at $157 billion valuation, as Microsoft, Nvidia, SoftBank join round CNBC