ChatGPT’s growth continues to reshape the hierarchy of the world’s most-visited websites, with new data showing that conversational AI is no longer a niche category but a mainstream digital destination. According to Similarweb’s September 2025 figures, ChatGPT now ranks as the fifth most visited site globally, trailing only Google, YouTube, Facebook, and Instagram. This puts the platform ahead of major long-established hubs such as Amazon, X, Reddit, WhatsApp, and Wikipedia — a shift that illustrates how quickly chatbot usage has scaled since mid-2024.
Similarweb’s reporting shows that visits to leading AI chatbots increased 76 per cent year-on-year, while mobile sessions expanded at an even sharper rate, growing seven-fold. ChatGPT accounted for 6.3 billion of those visits in September, representing roughly three-quarters of all traffic directed at generative AI platforms. Google’s Gemini came a distant second with just over a billion visitors, or about 12.5 per cent of total traffic. Other entrants in the category held comparatively small slices: China’s DeepSeek drew around four per cent of visits, while X’s Grok and the AI-focused search engine Perplexity each captured just over two per cent.
Audience demographics have shifted alongside this expansion. In 2023, the majority of chatbot activity came from users aged 18 to 34, representing 61 per cent of total usage. By 2025, that share had fallen to 53 per cent as older users adopted AI tools in larger numbers. Visitors aged 45 and above now generate nearly 30 per cent of overall traffic, indicating that conversational AI is broadening beyond early adopters into a more general-purpose digital utility.
Despite its position at the top of the category, ChatGPT faces mounting competitive pressure. Reporting from The Wall Street Journal indicates that OpenAI CEO Sam Altman recently issued a “code red,” urging the company to accelerate improvements to the platform’s user experience. The call comes as rivals, including last month’s release of Google’s Gemini 3, continue to post strong benchmark results and attract increased attention.
The evolving landscape highlights both rapid user-driven growth and intensifying competition among AI providers. Even as ChatGPT maintains a substantial lead in traffic, the broader market is far from static, and the coming year is likely to test how effectively these platforms can improve quality, reliability, and usability at scale.
