Move reported by the FT would make Japanese group the largest financial backer of US startup behind ChatGPT

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The Japanese investment group SoftBank is reportedly in talks to invest up to $25bn (£20bn) in OpenAI in a deal that would make it the biggest financial backer of the startup behind ChatGPT.

The lender is considering putting a sum of between $15bn and $25bn into the San Francisco-based company, according to the Financial Times.