ChatGPT App Reaches 1 Billion Monthly Users in Record Time

• ChatGPT surpassed apps like Google Maps and TikTok to reach 1 billion MAUs fastest, while Claude has 56 million MAUs with 640% year-over-year growth compared to ChatGPT's 62%
• U.S. users who installed Claude spent 5% less time on ChatGPT one month after installation, indicating meaningful competitive impact
• Anthropic filed for a U.S. IPO on Monday, with OpenAI expected to file in the coming weeks as both companies compete for AI market dominance

Summary:

OpenAI's ChatGPT has achieved a milestone of 1 billion global monthly active users (MAUs) as of May, becoming the fastest app ever to reach this threshold. The achievement came approximately three years after launch, surpassing the growth pace of major apps including Google Maps and TikTok, according to market intelligence firm Sensor Tower.

Key Competitive Dynamics:

The milestone occurs amid intensifying competition between OpenAI and Anthropic in the artificial intelligence market. Anthropic's Claude app has demonstrated significant momentum, reaching 56 million global MAUs in Q2 with year-over-year growth of approximately 640%, substantially outpacing ChatGPT's 62% YoY growth. Notably, U.S. ChatGPT users who installed Claude in Q1 2026 reduced their ChatGPT usage by 5% one month after installation compared to their prior eight-month average.

Market Implications:

Both companies are positioning for public markets, with Anthropic filing for a U.S. IPO on Monday and OpenAI reportedly preparing to file in the coming weeks. These IPO plans signal the maturing AI sector's transition from venture-backed startups to publicly-traded entities.

Investment Considerations:

The data reveals a rapidly expanding AI application market with ChatGPT maintaining dominance in absolute user numbers while facing growing competitive pressure from Claude's accelerating user acquisition. The significant disparity in growth rates (640% vs. 62%) suggests potential market share shifts, though ChatGPT's massive user base advantage remains substantial. Investors should monitor user engagement metrics and retention rates as key indicators of competitive positioning ahead of both companies' public offerings.