One Billion Users Is Not Enough: ChatGPT Falls Below 50%, Gemini and Claude Gain Ground

ChatGPT continues to be the benchmark of the chatbot industry, but its market share is no longer above 50%. For the very first time, in fact, OpenAI's chatbot has fallen below this threshold, as confirmed by the new State of AI Report 2026 from Sensor Tower.

More than one billion users but less than 50% of the total

ChatGPT is currently the market leader and boasts over 1 billion active users on a monthly basis. However, its market share is no longer above 50%. Updated data at the end of May 2026 confirms a drop to 46.4%.

The primary growth is seen among the two strongest competitors at the moment, namely Gemini, which has reached 27.7%, and Claude, which has hit 10.3%. Under 5%, we also see Grok, Perplexity, DeepSeek, and Meta AI finding their place.

According to Sensor Tower, the agreement between OpenAI and the U.S. Department of Defense has led to a wave of ChatGPT uninstalls, linked to a real boycott associated with the many political conflicts that characterize American society at this time.

Interestingly, Claude has recorded the highest rate of subscribed users overall, with a 13% share, allowing Anthropic to better monetize user growth. The race for leadership in the AI sector continues, and all companies involved are seeking ways to keep growing. OpenAI retains its leadership, although its share may continue to decline.