ChatGPT Hits 1 Billion Monthly App Users: Key OpenAI Statistics for Mid-2026

OpenAI's ChatGPT has solidified its position as the dominant consumer AI platform in mid-2026, with over 900 million weekly active users, 50 million paying subscribers, and a mobile app that became the fastest in history to reach 1 billion monthly active users. Behind the headline growth numbers, the company's business is undergoing a significant shift: enterprise revenue has crossed 40% of total sales and is on track to match consumer revenue by the end of the year.

This article compiles the key verified statistics for OpenAI and ChatGPT as of mid-2026, drawing on official OpenAI announcements, press reports, and third-party analytics. It also notes which frequently cited figures — such as specific market share percentages and IPO timing — could not be confirmed from the available sources.

900 Million Weekly Active Users — and Nearing 1 Billion

On February 27, 2026, OpenAI announced that ChatGPT had reached 900 million weekly active users, up from 800 million in October 2025 and more than double the 400 million reported in February 2025 . The company stated that subscriber momentum accelerated meaningfully at the start of the year, with January and February on track to be the largest months for new subscribers in its history .

As of mid-2026, the 900 million weekly figure has held steady, with no official update yet on crossing the 1 billion mark . However, multiple reports in July 2026 suggest ChatGPT is nearing 1 billion weekly active users, about seven months after initially targeting that milestone . To put the scale in context: roughly one in eight people on Earth interacts with ChatGPT every week .

Fastest App to 1 Billion Monthly Active Users

In a separate milestone, ChatGPT's mobile app crossed 1 billion monthly active users (MAUs) in May 2026, roughly three years after its November 2022 launch. According to market intelligence firm Sensor Tower, this makes ChatGPT the fastest application in history to reach that threshold, outpacing Google Maps (about five years), TikTok, Instagram, and YouTube . Sensor Tower estimated that ChatGPT's monthly active users grew approximately 62% year-over-year .

It is important to note that the 1 billion MAU figure comes from Sensor Tower, not from an audited OpenAI disclosure, and counts only mobile app usage (iOS and Android), excluding web traffic and API usage . That means total actual reach is even larger, but the precise number is not independently verifiable ahead of OpenAI's expected IPO filing.

50 Million Paying Subscribers and 9 Million Business Users

OpenAI confirmed in February 2026 that it had 50 million paying consumer subscribers across all ChatGPT tiers (Plus, Team, Pro, Enterprise) . This is a sharp increase from roughly 35 million in July 2025, equating to an average of approximately 433,000 new paying users per week over that period . More than 5% of weekly active users are paid consumer subscribers .

On the business side, OpenAI reported more than 9 million paying business users as of February 2026, up from over 1 million business customers previously . The company's enterprise customer base doubled to 2 million businesses in one year .

Revenue Growth: ~$25 Billion Annualized Run Rate

Sacra and other analysts estimated that OpenAI hit an annualized revenue run rate of approximately $25 billion in February 2026, up from about $20 billion at the end of 2025 . OpenAI itself reported generating roughly $2 billion per month in revenue as of March 2026 . For context, actual full-year 2025 revenue was approximately $13.1 billion .

Enterprise Now More Than 40% of Revenue

The most significant business shift at OpenAI in mid-2026 is the rise of enterprise. OpenAI Chief Revenue Officer Denise Dresser confirmed that enterprise now represents more than 40% of total revenue and is on track to reach parity with consumer revenue (50/50 split) by the end of 2026 .