ChatGPT Dips Below Half Market Share as AI Assistant Market Expands

ChatGPT's market share fell below 50% in June 2026 despite reaching 1.1 billion monthly users—faster adoption than any prior application. Google Gemini captured 662 million users, ending single-vendor dominance. The market expanded faster than any competitor's growth rate, leaving room for rivals leveraging distribution advantages like Android defaults and Search integration.