ChatGPT's AI Market Share Drops Below 50% for the First Time

Summary: According to Sensor Tower's State of AI 2026 report, ChatGPT's share of global AI assistant users slipped to 46.4% in May — the first time OpenAI's chatbot has held less than half the market.

Key Facts

• ChatGPT share: 46.4% as of May 2026 (first dipped below 50% in March 2026)
• Rivals closing fast: Gemini at 27.7%, Claude at 10.3%
• Absolute users still at record highs: ChatGPT 1.1B MAU, Gemini 662M, Claude 245M
• The 18–29 cohort is abandoning ChatGPT's lead most rapidly

Why It Matters

The 50% threshold is more than symbolic — it marks the end of OpenAI's near-monopoly on AI assistants. That absolute user numbers keep rising while share falls signals the overall market is expanding fast enough for rivals to capture new demand without having to steal existing users. For enterprise buyers and developers picking an AI platform, a genuinely contested market means better pricing, more leverage, and real choice.

Read More

• ChatGPT's market share slips below 50% for first time — TechCrunch
• Gemini, Claude Surge as ChatGPT Drops — TechTimes