The company started testing ads in ChatGPT U.S. earlier this year and has steadily expanded to add advertisers and tap into more markets, as it banks on advertising to boost overall revenue growth ahead of a potential IPO.

Two hundred days in, OpenAI has something Google and Facebook needed years to assemble: a billion-user surface, a self-serve pipe and a billion-dollar pace.

OpenAI's move to serve ads in ChatGPT earlier this year drew ridicule from its chief rival, Anthropic, in the form of a Super Bowl commercial.