A recent market analysis by Sensor Tower has identified OpenAI's ChatGPT as the dominant player in the global consumer artificial intelligence landscape. According to the findings, the platform now accounts for 63% of all-app purchase (IAP) revenue generated by generative AI applications — the money users spend on subscriptions and premium features inside mobile apps.

One key factor behind ChatGPT's success is its $20 monthly subscription model. That pricing strategy has allowed OpenAI to convert a surge of user interest into a steady and lucrative revenue stream. Despite the emergence of numerous alternative tools on app stores such as the App Store and Google Play, ChatGPT stands out for its ability to turn casual users into paying subscribers — a conversion few rivals have matched at scale.

ChatGPT's popularity is also evident in its engagement metrics. As of May 2026, the application had reached more than 1 billion monthly active users, making it the fastest mobile software to hit that milestone. It crossed the billion-user threshold in just three years, surpassing previous record-holders such as TikTok and Instagram.

The growth trend is not limited to ChatGPT alone, as the broader consumer AI market continues to boom. In-app purchases for generative AI platforms are expected to exceed $4 billion in the first half of 2026, marking a 36% increase compared with the previous six months. The momentum points to a rapidly expanding sector that shows no signs of slowing down — and to a consumer base that is increasingly willing to pay for AI tools as part of its regular app habits.

In 2026, however, the landscape of AI chat platforms is shifting. ChatGPT, once seen as the undisputed leader, has seen its share of unique active users drop below 50% for the first time. The change underscores the intensifying competition in the market, where several new players are gaining ground. The contrast with its 63% revenue share is telling: ChatGPT still commands where consumers spend their money, even as its hold on where they spend their time loosens.

One significant competitor is Anthropic's Claude, which has recorded a 452% increase in active users over the past year. Google Gemini, meanwhile, has been expanding its reach into international markets, drawing in more users and strengthening its presence. Notably, the average time users spend on Claude has risen from less than 40 minutes to about two hours per user — a sign that the assistant has captured the attention and loyalty of professional and enterprise audiences. Whether that engagement eventually translates into subscription revenue at a scale comparable to ChatGPT's remains one of the market's open questions.

Despite this fragmentation, a handful of companies still dominate overall user engagement. Together, ChatGPT, Google Gemini, and DeepSeek account for nearly 90% of all time users spend on AI assistant software worldwide — a reminder that even in a fragmenting market, the leading assistants still hold a tight grip on user attention, leaving a long tail of smaller apps to compete for the remainder.

As alternatives continue to enhance their features and improve their monetization strategies, the consumer market is evolving. The industry is moving from a scenario in which one platform holds the majority toward a highly competitive landscape in which multiple players vie for user attention — a shift that points to a future in which users have a broader range of options. How quickly challengers close the monetization gap — and whether ChatGPT can hold its revenue lead as its user share erodes — will be among the key dynamics to watch in the sector's next phase.