Comscore report shows ChatGPT share of AI prompt volume slips to 50% as Gemini, Claude gain ground

Comscore Q2 2026 AI Intelligence Report flagged accelerating fragmentation in AI assistant usage as Claude and Gemini gained prompt share.

• ChatGPT prompt share fell to 50% in June from 70% in January, despite 168 million desktop conversations.
• Gemini share rose to 30% from 17%, with desktop conversations increasing to 89 million from 8 million over 12 months.
• Claude share climbed to 11% from 2%; desktop conversations peaked near 40 million in April, easing to 22 million in June.
• AI assistant reach expanded to 35% of desktop users, 29% of mobile users in June; Google AI overviews reached 39.4% of desktop searches.