https://techcrunch.com/2023/04/28/openai-funding-valuation-chatgpt/ > OpenAI, the startup behind the widely used conversational AI model ChatGPT, has closed its new funding round of over $10.3 billion, TechCrunch has learned. > VC firms including Tiger Global, Sequoia Capital, Andreessen Horowitz, Thrive and K2 Global are in the round, according to documents seen by TechCrunch. A source tells us Founders Fund is also investing. Altogether the VCs have put in just over $300 million at a valuation of $27 billion – $29 billion. This is alongside a big investment from Microsoft announced earlier this year, a person familiar with the development told TechCrunch. The size of Microsoft’s investment is believed to be around $10 billion, a figure we confirmed with our source.