ChatGPT's global market share drops below 50% for first time

ChatGPT's share of AI assistant usage fell to 46.4% by end of May 2026, down from over 50% in January, according to Sensor Tower's State of AI Report. Gemini rose to 27.7%, Claude to 10.3%, and Grok, Perplexity, DeepSeek, and Meta AI each remained under 5%. ChatGPT still leads with 1.1B monthly users versus Gemini's 662M and Claude's 245M. Users are increasingly willing to switch assistants on news events. OpenAI's February DoD deal triggered a measurable spike in uninstalls, while Gemini benefits from Google ecosystem integration and Claude has built a developer-heavy following around its coding strength.

View full digest for June 17, 2026