The global AI assistant market is becoming more competitive than ever. While OpenAI’s ChatGPT continues to lead the segment by a comfortable margin, rivals such as Google’s Gemini and Anthropic’s Claude are steadily gaining ground. According to the latest Sensor Tower State of AI 2026 report, ChatGPT remains the world’s most popular AI assistant, but its dominance is no longer as overwhelming as it once was.
The report reveals that ChatGPT achieved a historic milestone by becoming the fastest mobile app ever to reach one billion monthly active users in May 2026. However, it also highlights an important shift in the AI landscape. For the first time, ChatGPT’s share of unique AI assistant users dropped below 50%, indicating that more users are exploring alternative AI platforms.
ChatGPT Still Leads, But Competition Is Growing
According to Sensor Tower, ChatGPT reached one billion monthly active users in just three years, making it the fastest mobile application to achieve the milestone.
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Despite this remarkable growth, the report notes that OpenAI‘s share of unique AI assistant users fell below 50% in March 2026 for the first time. The decline does not necessarily indicate that ChatGPT is losing users. Instead, it reflects the rapid growth of competing AI assistants as consumers increasingly use multiple AI platforms for different tasks.
The findings suggest that the AI assistant market is evolving into a competitive ecosystem rather than one dominated by a single platform.
Gemini And Claude Continue To Gain Momentum
Among ChatGPT’s biggest challengers, Google Gemini has strengthened its position through deep integration with Android smartphones and Google’s broader ecosystem of services.
With Gemini becoming the default AI assistant across many Android devices, Google has significantly increased its reach among smartphone users worldwide. The seamless integration gives Gemini a major advantage by making AI features instantly accessible without requiring users to download a separate application.
Meanwhile, Claude, developed by Anthropic, has emerged as one of the fastest-growing AI assistants across several global markets. Its focus on natural conversations, coding assistance, document analysis, and enterprise use cases has helped attract both individual users and businesses looking for reliable AI solutions.
The growing popularity of Gemini and Claude reflects how quickly competition is intensifying in the generative AI industry.
AI Is Changing The Way People Shop Online
The report also highlights the growing influence of AI assistants on online shopping decisions. Consumers are increasingly using AI to research products, compare specifications, and receive personalised buying recommendations before making purchases. Categories such as consumer electronics, fashion, and home goods have witnessed particularly strong growth in AI-assisted shopping.
Sensor Tower notes that GenAI referral traffic to online retailers has increased significantly over the past year. Retailers including Walmart and Target have integrated AI assistants into their shopping platforms and reportedly recorded more than a 1.5% increase in GenAI referrals. Amazon, on the other hand, has seen comparatively lower AI referral growth due to its more closed ecosystem and limited crawler access.
Interestingly, shoppers using AI-powered assistants like Amazon Rufus are converting at nearly twice the rate of customers who do not use AI tools, suggesting that artificial intelligence is improving both product discovery and purchase decisions.
AI Is Becoming A New Advertising Platform
Beyond shopping, AI assistants are also emerging as a new channel for digital advertising. According to the report, platforms like ChatGPT are gradually becoming spaces where brands can reach users through AI-powered recommendations and sponsored experiences.
OpenAI reportedly began testing advertisements on ChatGPT in early 2026, and ad impressions grew sevenfold by May 2026. Although overall advertising penetration remains relatively low, the rapid increase indicates growing interest from marketers exploring AI as the next major digital advertising platform.
The report also notes that AI has become a mainstream marketing theme across the internet. More than 200,000 mobile applications now mention AI in their app descriptions, while AI-related advertising creatives generated over $1.3 billion in global ad spending during the first quarter of 2026.
The AI Battle Is Just Getting Started
The latest findings underline how quickly the AI industry is evolving. Instead of relying on a single assistant, many users are now switching between ChatGPT, Gemini, Claude, and other AI tools depending on their specific needs. Some prefer ChatGPT for creativity and writing, Gemini for integration with Google’s services, and Claude for long-form analysis and coding tasks.
As AI models continue improving and companies invest heavily in new capabilities, competition is expected to become even more intense over the coming years.
Conclusion
The Sensor Tower State of AI 2026 report paints a clear picture of an AI industry entering its next phase of growth. ChatGPT continues to lead the global AI assistant market and has achieved the remarkable milestone of reaching one billion monthly active users faster than any mobile app before it. However, the rapid rise of Gemini and Claude shows that users are increasingly embracing multiple AI platforms instead of depending on just one.
The report also highlights AI’s growing impact beyond conversations. From online shopping and product recommendations to digital advertising, artificial intelligence is rapidly reshaping how consumers interact with technology. As the competition between leading AI companies intensifies, users can expect faster innovation, smarter features, and even more capable AI assistants in the years ahead.
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