Research company Sensor Tower recently released findings estimating that OpenAI’s ChatGPT had crossed 1 billion monthly active users (MAUs) on its app in May 2026. This news would make ChatGPT the fastest app in history to reach this number.
In its State of Mobile Report 2026, Sensor Tower found ChatGPT beat the pace set by other popular apps including Google Maps, TikTok, Instagram and YouTube in hitting the 1 billion threshold, a milestone coming three years after launch.
The number represents a win for OpenAI in the battle for AI chatbot supremacy, with ChatGPT competing with the likes of Anthropic’s Claude and X’s Grok.
In April, OpenAI revealed it hit 900 million weekly active users as of December 2025 and API usage is more than 15 billion tokens per minute. However, it has not revealed official statistics for 2026.
Source: Mobile World Live
Image Credit: ChatGPT
Source: Tahawul Tech