OpenAI’s valuation has surged to $500 billion after a $6.6 billion secondary stock sale, briefly making it the world’s most valuable startup ahead of SpaceX and ByteDance. The Associated Press reports: Current and former OpenAI employees sold $6.6 billion in shares to a group of investors, pushing the privately held artificial intelligence company’s valuation to $500 billion, according to a source with knowledge of the deal who was not authorized to discuss it publicly….

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