It has been three and a half years since ChatGPT made its debut. At that time, many people realized for the first time that a dialog box could become the next-generation internet gateway. Today, it has long been the fastest application in human history to reach 1 billion monthly active users. Yet, at the same time, it has reached a symbolic turning point:
ChatGPT's global market share has fallen below 50% for the first time.
According to data analytics firm Sensor Tower's "State of AI 2026 Report," as of the end of May this year, ChatGPT's share of the global AI assistant market dropped to 46.4%. Before January this year, that figure was still above 50%. ChatGPT remains the world's largest AI assistant. But leading no longer equals monopolizing.
The AI assistant boom ignited by OpenAI has moved from awe, trial, and admiration into the stages of product comparison, ecosystem integration, paid conversion, and commercial realization.
Loyalty Is a False Proposition, Users Are All 'Heartbreakers'
In 2023, having a ChatGPT account still carried a certain identity of being an AI pioneer.
By 2026, AI assistants have increasingly become internet infrastructure, much like search, email, and office suites. The most noteworthy change in the Sensor Tower report is not just that ChatGPT still ranks first.
More importantly, users are becoming more willing to migrate. As long as another assistant is more convenient in a specific scenario, users will immediately allocate time to another product.
The main competitors pulling ChatGPT's share below 50% are Gemini and Claude.
As of the end of May, Gemini's global share reached 27.7%, and Claude reached 10.3%. Products like Grok, Perplexity, DeepSeek, and Meta AI each still hold less than 5%, but they are also constantly squeezing the remaining market.
Gemini's growth is easy to understand. It's backed by Google's complete ecosystem. Search, Gmail, Docs, Calendar, and Android are all natural entry points. When AI is embedded into tools users rely on daily, many average users have no need to specifically open another webpage to summon ChatGPT.
Especially after the release of Gemini 3.0, Google also achieved its first truly significant victory, officially securing a seat at the AI table and entering the mainstream user's view.
Claude's path is more like a victory for a productivity tool.
It lacks a distribution system like Google's, but has built a strong reputation in scenarios like writing, coding, long-text processing, and complex task collaboration. Sensor Tower states that Claude is approaching ChatGPT's user retention levels. For power users, AI assistants have shed their toy-like attributes and are genuinely beginning to impact work efficiency.
A more subtle change is that when users evaluate AI products, they no longer look solely at model capability. As AI assistants gradually take on more personalized interaction characteristics, users are also starting to discuss work, emotions, judgments, and decisions with them. Brand trust, value orientation, and institutional relationships can all become part of the user's choice.
A hint of public controversy can trigger a massive wave of uninstalls. OpenAI CEO Sam Altman has likely gained a deep understanding of this over the past year.
AI companies once believed that as long as the model was stronger, users would stay. The reality in 2026 is far more complex. Capability, ecosystem, price, use case, and brand trust are now collectively determining whether an assistant will be used consistently.
The Free Lunch Is Over, AI Apps Start Talking Money
Beyond market share, another set of data from the Sensor Tower report better illustrates the stage change in the industry: AI applications are still growing, but the growth logic has changed.
Sensor Tower estimates that in the first half of 2026, global AI app downloads will approach 2.3 billion, with in-app spending exceeding $4.2 billion. In comparison, AI app in-app spending was $1.83 billion in the first half of 2025.
Users are still downloading AI apps and are also willing to pay for AI.
However, the growth rates for both downloads and spending have slowed. Meanwhile, the industry has moved from a period of rapid expansion into a more realistic phase of competition.
Vendors can no longer just talk about user growth; they must also prove they can turn traffic into revenue. Regional differences are also emerging. Asia remains the market with the highest AI app downloads, but in Q1 2026, downloads declined for the first time by 3.3%, mainly affected by markets like India.
In contrast, North America and Europe are stronger in terms of in-app consumption. For AI companies, what truly determines the business model is often the ability to pay; install base only solves part of the problem. The trend in the US market is more pronounced. Users are starting to use AI assistants for productivity tasks and are more willing to pay for premium features.
Claude performs notably well here. Sensor Tower states that Anthropic has 13% of its users subscribing to a paid plan, a conversion rate ranking among the highest in the industry. This 13% subscription conversion rate explains why Claude can continue to expand its presence amidst competition from giants.
As long as AI can help users save time, complete code, organize documents, and handle complex tasks, monthly subscription fees ranging from twenty to even two hundred dollars are actually within an acceptable range. ChatGPT's commercialization path is more diverse and also more controversial. Sensor Tower states that OpenAI began testing ads in ChatGPT starting in February this year, gradually expanding the scale of ad displays and the proportion of users covered.
By May, an average of 17% of users were seeing ads daily. Software and shopping are currently the largest advertiser categories, followed by media & entertainment, and food & beverage.
From subscriptions to ads, ChatGPT is moving towards a more typical internet business model. Early users were familiar with a clean dialog box, an entry point imbued with the imagination of Artificial General Intelligence (AGI).
Unfortunately, even the smartest AI on this planet ultimately cannot escape the fate of becoming a shopping guide.
For OpenAI, ads and shopping have become necessary experiments to advance. Now, this entry point is also starting to carry ads, shopping guides, recommendations, and transaction conversions.
Model inference, training, and computing power expenses are extremely costly; relying solely on subscription revenue can hardly cover long-term investments. Advertising and shopping are becoming the next pieces of the puzzle for ChatGPT's commercialization.
As AI begins to penetrate core scenarios like shopping, office work, and search, the imagination of AI becoming a unified super-gateway is also encountering increasingly realistic platform boundaries. Sensor Tower estimates that in the first half of 2026, global AI app usage time will grow from 17.2 billion hours in the same period last year to approximately 36 billion hours.
Among them, the top three AI assistants account for 89% of the total usage time of AI assistant apps.
New players still have opportunities, but these opportunities exist more in fragmented scenarios, such as AI companions, AI content generation, and vertical industry tools. The main battlefield for general assistants is already mostly occupied by ChatGPT, Gemini, and Claude.
Stepping Down from the Altar, AI Goes Mainstream
ChatGPT's share decline occurs at a somewhat paradoxical time: OpenAI's revenue is still growing rapidly, its user base is still expanding, and its capital reserves far exceed those of most startups. According to a report by The Information, based on documents OpenAI disclosed to shareholders, OpenAI consumed $3.7 billion in cash in the first quarter, more than half of its $5.7 billion revenue.
Both cash burn and revenue tripled compared to the same period last year.
This is also a common challenge facing the current AI industry. Users and revenue continue to grow, yet massive capital investment is required to sustain model training, inference services, and infrastructure construction.
Furthermore, OpenAI expects cash burn could reach $25 billion in 2026, further rising to $57 billion in 2027. Even though OpenAI has confidentially submitted its IPO filing documents, the listing time may still be adjusted based on market conditions.
In other words, as one of the world's strongest AI brands, OpenAI still needs to answer a question: when models become increasingly expensive, competition grows fiercer, and users become more prone to migrate, how high can ChatGPT's business model's profit margin ultimately be.
Nevertheless, even as ChatGPT's share falls below 50%, it remains the world's largest AI assistant and is still the name most frequently mentioned when discussing AI. But this milestone is symbolic. The AI assistant market has moved beyond the era defined by a single product. In the past, ChatGPT was responsible for convincing the public that AI could change the internet.
Now, Gemini, Claude, Grok, DeepSeek, and various vertical AI assistants are collectively dividing up user time, usage scenarios, and commercial revenue.
User demands are also subtly changing.
By now, you likely no longer find satisfaction in just having AI write a poem or tell a silly joke. Instead, you start demanding it write code with fewer errors, process documents more accurately, collaborate in office work more conveniently, and offer more reasonable subscription prices, etc.
When a technology no longer elicits repeated amazement but instead begins to be criticized, compared, and replaced, it has truly started to enter mainstream life.
ChatGPT has lost half of its market dominance, but AI has truly begun to win over the world.
It's just that in this new world, there are no eternal kings, only us, forever ready to migrate for better tools.
