As rivalry grows between Anthropic and OpenAI for dominance in artificial intelligence, the latter’s ChatGPT app has surpassed 1 billion monthly active users worldwide – the fastest an app has ever reached that milestone.
ChatGPT reached 1 billion global monthly active app users in May 2026, making it the fastest app ever to achieve the milestone.
OpenAI’s chatbot hit the mark in roughly three years, surpassing the growth rates of apps such as TikTok, Instagram, YouTube, and Google Maps.
The milestone comes amid an escalating race between OpenAI and Anthropic to dominate the booming AI sector, with Reuters reporting that OpenAI is preparing an IPO filing, following Anthropic’s own filing on June 1.
