ChatGPT Reaches Record 626.9 Million Monthly Active Users

ChatGPT, the artificial intelligence chatbot developed by OpenAI, reached a new peak of 626.9 million monthly active users in May 2026, according to tracking firm Similarweb. The figure reflects a 13% increase over April, cementing the platform’s position as the most heavily used consumer AI service globally.

Similarweb measures web traffic and app engagement across the internet, providing a widely cited benchmark for digital usage. The milestone underscores sustained demand for AI chat tools, even as technology companies accelerate efforts to capture market share with competing models and pricing strategies.