ChatGPT drew 56.4% of global AI chatbot website visits in September 2026, or about 5.9 billion visits, according to a Visual Capitalist ranking built on Similarweb data. That lead remains large, but it has narrowed sharply from 88% at the end of 2024 and 71.8% in October 2025. Total visits across the tracked chatbot sites reached roughly 10.5 billion for the month.

Google's Gemini ranked second with 25.0% of visits, or about 2.6 billion, up 11.4 percentage points from 13.6% a year earlier. Together, ChatGPT and Gemini accounted for more than 80% of AI chatbot web traffic. Gemini's monthly visits rose roughly 2.5 times over the past year, from 1.1 billion to 2.6 billion, following Google's launch of Gemini 3 in late 2025.

Anthropic's Claude posted the biggest relative gain. Its share more than quadrupled from 2.3% in October 2025 to 9.6% in September 2026, moving it from fifth place to third with about 1.0 billion visits. Claude now draws more visits than DeepSeek at 3.4%, Grok at 2.3%, Microsoft Copilot at 1.5% and Perplexity at 0.9% combined. Those four platforms saw their combined share fall from 11.4% to 8.1%.

ChatGPT's falling share does not reflect shrinking traffic. Its site drew about 5.9 billion visits in September, up from 5.7 billion in January, while rivals grew faster. The figures cover desktop and mobile web visits only and exclude app use, API traffic and AI built into other products, so Copilot's count does not include its presence in Windows and Office. For marketers working on generative engine optimization, the data shows brand visibility in AI answers increasingly depends on more than one platform.

Source: Visual Capitalist - https://www.visualcapitalist.com/most-used-ai-chatbots-by-web-traffic-2026/