ChatGPT's Dominance Eroding as Claude and Gemini Gain Share — Comscore, Inc.

Event summary

ChatGPT's share of AI prompt volume fell from 70% to 50% between January and June 2026 as Claude and Gemini gained ground.
Claude's share of AI prompt volume grew more than fivefold, from 2% to 11%, in the same period.
Gemini's share of AI prompt volume increased from 17% to 30%, nearly doubling its market presence.
AI assistant reach expanded, with 35% of desktop users and 29% of mobile users visiting an AI assistant in June 2026.
AI overviews in search grew, with Google's AI overviews increasing from 25.8% to 39.4% and Bing's Copilot Search from 11.8% to 17.3%.

The big picture

The AI assistant market is experiencing a significant shift as ChatGPT's dominance wanes and competitors like Claude and Gemini gain traction. This fragmentation reflects broader trends in consumer behavior, where users are increasingly diversifying their AI tool usage. The expansion of AI overviews in search and the growing reach of AI assistants highlight the evolving landscape of digital interaction and the potential for AI to influence brand visibility and monetization strategies.

What we're watching

Market Fragmentation: How the rapid diversification of AI assistant usage will impact brand strategies and consumer engagement.
Mobile Growth: Whether the pace of mobile AI adoption will continue to outpace desktop, reshaping user behavior.
Monetization Trends: The extent to which AI will evolve as a brand discovery and monetization channel, particularly in sectors like fashion and travel.