OpenAI generated around $US4.3 billion in revenue in the first half of 2025. Photo: AP PHOTO

OpenAI, the company behind ChatGPT, has reached a valuation of $US500 billion ($A756 billion), following a deal in which current and former employees sold roughly $US6.6 billion worth of shares, a source familiar with the matter told Reuters.

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This represents a bump-up from its current valuation of $US300 billion, underscoring OpenAI's rapid gains in both users and revenue.

As part of the deal, OpenAI employees sold shares to a consortium of investors including Thrive Capital, SoftBank, Drag

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