AI BriefingChatGPT Market Share Falls Below 50%
Key point
ChatGPT's market share dropped below 50% for the first time due to intensifying competition.
Details
According to Sensor Tower data, ChatGPT's market share fell to 46.4% as of the end of May 2026, breaking below the 50% mark for the first time.
As recently as January 2026, ChatGPT maintained a dominant position with over 50% share, but aggressive pursuit by competitors such as Google and Anthropic is dispersing market dominance.
However, despite the decline in share, ChatGPT still remains the largest individual service by scale, achieving 1.1 billion monthly active users (MAU) based on its mobile app.
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