Although ChatGPT remains the most popular generative artificial intelligence service, its market share has seen a notable reduction of 20% when compared to competitors Google Gemini and Anthropic's Claude, as revealed in the second quarter of 2026.
The data was presented in the latest edition of Comscore's AI Intelligence Report, which was based on information collected by the company's platforms regarding browsing habits on computers and mobile devices.
The survey confirmed that ChatGPT still leads the sector, but it observed a drop in its share, which fell from 70% in January to 50% in June 2026. Simultaneously, Google registered significant growth, with Gemini's share almost doubling, rising from 17% to 30% in the same period.
Claude also demonstrated considerable advancement; having only 2% market share at the beginning of the year, it reached 11% in June. Other monitored services include DeepSeek with 2%, Grok with 1%, and Perplexity with less than 1% in the second quarter of 2026.
The trend indicated by the report suggests that the decrease in ChatGPT's share is not linked to a perceived decline in service quality, but rather to increased competition, which allowed users to test and use other solutions more frequently.
It was found that Google is actively promoting Gemini among its users, utilizing the reach of its web search engine as a strategic pillar. Meanwhile, Anthropic has focused on positioning Claude as a sophisticated tool intended for more complex and professional tasks.
Despite the change in percentage share, OpenAI's service did not see its audience decrease; the same report indicates that ChatGPT's multi-platform audience grew from 59 million to 99 million between June 2025 and June 2026.
Given this competitive scenario, Comscore advises companies to adopt a comprehensive view of the market in their operational strategies, instead of focusing solely on a single solution. Smriti Sharma, Director of Analysis and Technology at Comscore, emphasizes that, with the intensification of the dispute between AI assistants and the redistribution of requests among platforms, brands, and publishers, one can no longer assume that a single AI experience defines the market.