ChatGPT (OPENAI) Reaches 1 Billion Monthly Users in May 2026

OpenAI's ChatGPT recorded one billion monthly active users (MAUs) as of May 2026, making it the fastest app to achieve this milestone within 3.5 years of its November 2022 launch, according to Sensor Tower. In contrast, Google Maps took about five years to reach the same figure. Although ChatGPT maintains a significant user base, competition is intensifying with Anthropic's Claude and Meta AI experiencing year-on-year usage spikes of 640% and 973%, respectively. OpenAI is also moving towards a public offering, having submitted its IPO filing recently, highlighting growing investor interest despite mixed public sentiment toward AI.