Report: Claude, Gemini gain ground on ChatGPT
September 23, 2026



Comscore, a specialist in measuring and analysing consumer behaviours, has released its Q2 2026 AI Intelligence Report, which shows that consumers are rapidly diversifying which AI assistants they use even as the overall category keeps expanding.

According to Comscore panel data, Claude’s share of total AI prompt volume grew from 2 per cent in January 2026 to 11 per cent in June 2026, while Google’s Gemini nearly doubled, from 17 per cent to 30 per cent, over the same period. ChatGPT remains the clear category leader but has seen its share of AI prompt volume fall from 70 per cent to 50 per cent as the competitive field widened. The report also found that the rate of growth on mobile is now outpacing desktop, with adoption of AI assistant up 12 per cent and 25 per cent respectively since the start of 2025.


“As competition among AI assistants intensifies and prompt volume shifts across platforms, brands and publishers can no longer assume that a single AI experience defines the market,” said Smriti Sharma, Chief Analytics and Technology Officer at Comscore. “Understanding where consumers are turning with their questions, which sources AI cites in response, and how those interactions convert into measurable business outcomes is becoming essential to any brand’s growth strategy in this new era of AI-influenced discovery.”

The report offers a panel-based view of how AI usage, AI-powered search, and brand visibility inside AI responses are evolving together. As prompt volume fragments across a growing set of platforms and AI overviews become a fixture of everyday search, the data offers marketers, publishers, and platforms a clearer picture of where consumer attention is migrating.

Key Findings:

ChatGPT remains the category leader, but its share is eroding. ChatGPT reached 168 million desktop conversations in June 2026 and grew its multiplatform visitation to 99 million from 59 million a year earlier, yet its share of total AI prompt volume fell from 70 per cent to 50 per cent between January and June 2026 as consumers spread their usage across a wider range of tools.
Claude’s share increased more than fivefold during time. Claude’s share of the AI prompt volume rose from 2 per cent to 11 per cent between January and June 2026. Desktop conversations increased from 1.1 million in October 2025 to a high of nearly 40 million in April 2026 before plateauing at 22.3 million in June — still about 20 times the levels in October 2025, even as growth slowed through the summer months.
Gemini’s share of AI prompt volume increased from 17 per cent to 30 per cent from January to June 2026, with desktop conversations rising from 8 million to 89 million over the past year despite a similar early-summer slowdown.
AI assistant reach continues to expand. In June 2026, 35 per cent of desktop users and 29 per cent of mobile users visited an AI assistant, compared to 25 per cent and 12 per cent, respectively, in January 2025.
Women are still the biggest users of AI assistants on mobile. Female mobile index scores for ChatGPT, Copilot and Gemini (110, 119 and 115 respectively) continued to outperform male usage on mobile in June 2026 despite men over-indexing on desktop on the same platforms.
Major social platforms have experienced significant uplift in visitors using AI assistants between June 2025 and June 2026. TikTok grew from 32 per cent to 53 per cent, Meta from 32 per cent to 47 per cent and YouTube from 30 per cent to 39 per cent.
AI overviews continue to grow their presence in search. Google desktop searches with an AI overview grew from 25.8 per cent in July 2025 to 39.4 per cent in Jun 2026, and Bing’s Copilot Search increased from 11.8 per cent to 17.3 per cent in the same time period.
AI is emerging as both a brand discovery and monetisation channel. Fashion brand mentions in AI responses grew 123 per cent and Health/Beauty brand mentions grew 150 per cent between January and March 2026, while sponsored ads began appearing inside AI travel search results — rising from 6 per cent of hotel-related prompts with source links in March 2026 to 24 per cent by May 2026.