ChatGPT: ChatGPT Becomes the Most Popular AI App, Surpassing the 1 Billion User Mark; How Is Claude Faring?

ChatGPT MAU Record: According to market analysis firm Sensor Tower, ChatGPT has become the fastest app to achieve this milestone. However, this achievement comes at a time when the competition between OpenAI and Anthropic is continuously intensifying.

**1 Billion Users in Just Three Years**
According to Sensor Tower's estimates, ChatGPT reached the milestone of 1 billion monthly active users in May. With this, ChatGPT has broken the records previously set by popular apps such as Google Maps, TikTok, Instagram, and YouTube. Nevertheless, competition between OpenAI and Anthropic is rapidly escalating within the market, as both companies strive to strengthen their foothold in the AI ​​sector.

**How ​​Many Active Users Does Claude Have?**
According to Sensor Tower's report, by the second quarter of 2026, Anthropic's Claude app had accumulated 56 million monthly active users worldwide. Although Claude currently lags significantly behind ChatGPT in terms of total user count, its accelerating growth rate remains a cause for concern among its competitors.

While ChatGPT is growing at a steady year-over-year pace of 62%, the Claude app has recorded a staggering 640% year-over-year growth. This remarkable speed in acquiring new users clearly demonstrates how rapidly the Claude app is advancing to carve out a strong position for itself in the AI ​​market within a very short span of time.

**Will the Two Now Face Off in the Stock Market (IPO)?**
The battle between these two tech companies is not limited merely to users; it is now extending to Wall Street (the stock market) as well. Last Monday, Anthropic confidentially filed documents for its IPO (Initial Public Offering) in the U.S. market. On the other hand, according to a Reuters report, AI market leader OpenAI is not lagging behind either and is fully preparing to file its IPO in the coming weeks. It is evident that, in the days ahead, this commercial battle between these two companies is set to reshape the tech industry.

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