From Total Dominance to a Shrinking Slice of the AI Pie
ChatGPT’s market share decline refers to the shift from its former near-total dominance of consumer AI chatbots to a contested position, where faster-growing rivals like Gemini and Claude are eroding its share despite absolute user growth continuing to rise. OpenAI’s flagship assistant started at 100% of the market when it launched and became the fastest online service ever to reach 1 billion monthly users. Yet Sensor Tower’s latest State of AI Report shows its market share slipping to 46.4% by the end of May, the first time it has fallen below 50%. ChatGPT now serves more than 1.1 billion monthly active users, but those users are part of a wider, maturing AI chatbot ecosystem. As the overall pie grows, competing assistants are claiming larger slices, turning what was once a one-horse race into a crowded contest.
Gemini vs ChatGPT and Claude’s Steady Climb
The AI chatbot competition is now defined by accelerating gains for Gemini and Claude. Sensor Tower data shows Gemini holding 27.7% of the market with 662 million monthly users, while Claude has 10.3% and 245 million users. In January, ChatGPT still controlled more than half the market; by May, that advantage was gone. According to Sensor Tower’s State of AI Report, “ChatGPT’s market share dropped below 50% for the first time, falling to 46.4% by the end of May.” Gemini’s growth is helped by tight integration with Google’s wider suite of tools, keeping it visible in daily workflows. Claude has found a niche in productivity tasks and is closing in on ChatGPT’s user retention rate. Together, these shifts signal an AI dominance shift from a single preferred assistant to a portfolio of options users switch between for different needs.
Trust, Values, and the Cost of Missteps
ChatGPT’s market share decline is not only about features; it is also about trust and values. Sensor Tower’s report links a spike in ChatGPT uninstalls to OpenAI’s USD 200 million (approx. RM920 million) contract with the U.S. Department of Defense, suggesting that many users weigh ethical alignment alongside raw capability. At the same time, OpenAI has begun experimenting with ads. By May, an average of 17% of ChatGPT’s daily users were being shown advertising, and the service now includes referral links to retailers such as Target, Walmart, and Costco. Gemini and Claude, in contrast, are still mainly framed as tools, not ad platforms. This gap matters for heavy users who want stable, distraction-free environments. As users grow more selective, reputational hits and perceived commercialization can push them to try competing assistants that feel more neutral or focused.
Citation Accuracy and the New Battle for Reliability
As AI assistants spread into research, work, and decision-making, users are paying closer attention to citation accuracy and clear source attribution. This is one area where ChatGPT is widely seen as underperforming compared with its competitors, even as its underlying models improve. Gemini benefits from being tied into Google’s search and knowledge systems, which can surface links and sources in a more familiar, web-like format. Claude has built a reputation for careful reasoning and source-conscious responses in productivity and knowledge tasks, which helps explain its strong 13% subscription conversion rate among its 245 million users. Users who care about verifiable information are more likely to try alternatives when answers feel opaque or poorly sourced. In this context, better sourcing is not a minor feature; it is a core differentiator that shapes which assistant becomes the default for high-stakes queries.
Maturing Market: Slowing Growth, Rising Spend, and What Comes Next
Despite the AI dominance shift, all three leading chatbots still benefit from expanding demand. Total spending on AI assistants is set to reach USD 4.2 billion (approx. RM19.3 billion) in the first half of this year, up from USD 1.83 billion (approx. RM8.4 billion) in the first half of last year, while total hours spent in AI apps are projected to rise from 17.2 billion to about 36 billion. Yet download and spending growth rates are slowing, signs that the market is maturing. Users now treat AI assistants as interchangeable tools, switching between them based on task, trust, and features. For OpenAI, the risk is that a shrinking share today becomes a weaker position when the next big platform shift arrives. For Gemini and Claude, the challenge is to turn today’s momentum into long-term loyalty and revenue.
