The generative AI landscape has seen explosive growth over the past two years, with millions of users flocking to platforms that promise to revolutionize how we work, create, and communicate. SimilarWeb data from October 2025 reveals the current standings of the leading AI tools, with some clear winners emerging in the race for user adoption.
ChatGPT Dominates with 571.85 Million MAUs
OpenAI’s ChatGPT continues to reign supreme in the generative AI space, commanding an impressive 571.85 million monthly active users. The conversational AI platform, which allows users to engage in natural language dialogues for everything from answering questions to writing code and generating creative content, has become synonymous with AI for many consumers and businesses. ChatGPT’s combination of accessibility, versatility, and continuous improvements has solidified its position as the market leader by a significant margin.
Google Gemini Secures Second Place with 126.39 Million MAUs
Google’s Gemini platform has established itself as the second most popular generative AI tool with 126.39 million monthly active users. Integrated across Google’s ecosystem of products, Gemini serves as the company’s flagship AI assistant, offering capabilities that span text generation, image creation, coding assistance, and complex reasoning tasks. Its deep integration with Google Workspace and other Google services, along with viral releases like Gemini 3 and Nano Banana Pro, have helped it capture a substantial user base, though it still trails ChatGPT by a considerable distance.
DeepSeek Shows Strong Performance at 61.62 Million MAUs
Chinese AI startup DeepSeek has emerged as a notable player in the global AI race, attracting 61.62 million monthly active users. The platform offers advanced language model capabilities with a focus on reasoning and problem-solving tasks. DeepSeek’s strong performance, particularly in technical and research-oriented applications, demonstrates the growing diversification of the AI market and the rise of non-Western competitors in the space.
Perplexity Reaches 61.28 Million MAUs
Perplexity, which positions itself as an AI-powered answer engine, has reached 61.28 million monthly active users. The platform differentiates itself by combining conversational AI with real-time web search capabilities, providing users with cited, up-to-date information rather than purely generated responses. This approach has resonated with users seeking more reliable and verifiable AI-generated information, particularly for research and fact-checking purposes.
Grok Accumulates 39.57 Million MAUs
Grok, the AI chatbot developed by xAI (Elon Musk’s AI venture), has accumulated 39.57 million monthly active users. Integrated into the X platform, Grok offers users conversational AI capabilities with a distinctive personality and access to real-time information from the X platform. Its integration into a major social media ecosystem and its positioning as a more irreverent alternative to other AI assistants has helped it build a dedicated user base.
Claude Hits 17.57 Million MAUs
Anthropic’s Claude rounds out the top six platforms with 17.57 million monthly active users. Known for its emphasis on helpfulness, harmlessness, and honesty, Claude has carved out a niche among users who prioritize safety and nuanced reasoning in their AI interactions. The platform excels at complex analysis, coding tasks, and maintaining coherent long-form conversations, attracting professionals and researchers who require sophisticated AI assistance.
The Competitive Landscape
The October data reveals a highly concentrated market where ChatGPT commands nearly half of the total monthly active users among these top platforms. However, the presence of multiple viable competitors suggests the AI market is far from winner-take-all, with different platforms serving distinct user needs and preferences. As the technology continues to evolve and new players enter the market, these numbers will likely shift, but for now, the hierarchy of AI platform adoption is clearly established.