When Masayoshi Son and Sam Altman first met each other in 2017 at SoftBank’s offices in Tokyo, the younger entrepreneur lacked a project large enough to tempt the tech billionaire to get his cheque book out.
Over the next two years, as Altman’s OpenAI evolved into one of the world’s most potent artificial intelligence companies, Son tried to invest close to $1bn in the ChatGPT-maker.
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