OpenAI stated that more than 100,000 advertisers have run campaigns on ChatGPT since testing began in the U.S. in February 2026.

From the articleOpenAI Expands ChatGPT Ads to 26 More Countries, Says It Has More Than 100,000 AdvertisersAlso in ChatGPT ads reach 89 countries as advertisers pass 100,000, OpenAI expands ChatGPT ads to 26 more countries in bid to boost revenue | Reuters, OpenAI expands ChatGPT Ads to 26 new countries as diversification push accelerates, OpenAI expands ChatGPT ads to more countries: Full list