ChatGPT’s market share slips below 50% for first time as users flock to Gemini and Claude

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ChatGPT’s market share slips below 50% for first time as users flock to Gemini and Claude

More than three and a half years after its initial release, ChatGPT remains the world’s most popular AI assistant — but its dominance is no longer absolute. According to analytics firm Sensor Tower’s State of AI Report for 2026, ChatGPT’s market share has dipped below 50% for the first time, settling at 46.4% by the end of May. The shift reflects a rapidly maturing market where users are increasingly willing to switch between assistants based on trust, integration, and specific use cases.

Market share shifts and user migration

Sensor Tower’s data shows that ChatGPT commanded over 50% market share until January 2026. By May, it had fallen to 46.4%, while Google’s Gemini rose to 27.7% and Anthropic’s Claude reached 10.3%. Other assistants, including xAI’s Grok, Perplexity, DeepSeek, and Meta AI, each hold less than 5% market share. The report highlights that specific events accelerate user migration. For example, OpenAI’s deal with the U.S. Department of Defense in February triggered a measurable spike in ChatGPT uninstalls, suggesting that brand trust and values alignment matter to users as much as features.

Gemini’s momentum is largely attributed to its deep integration with Google’s broader ecosystem of tools. Meanwhile, Claude has built a strong reputation for productivity use cases and is closing in on ChatGPT’s user-retention rate. The top three assistants — ChatGPT, Gemini, and Claude — command 89% of total time spent on AI assistant apps.

Download and spending trends signal market maturation

In the first half of 2026, people are on pace to download nearly 2.3 billion AI apps and spend over $4.2 billion on them, according to Sensor Tower estimates. That compares to $1.83 billion in spending in H1 2025 — a jump that suggests the industry is shifting from pure growth toward monetization. However, both download and spend growth rates have decelerated, indicating the market may be maturing even as absolute numbers climb.

Regionally, Asia recorded its first download decline of 3.3% in Q1 2026, driven by dips in China and India. Despite leading globally in total downloads, Asia trails North America and Europe in in-app spending — a split that matters for companies deciding where to invest in premium features and monetization strategies.

Monetization and advertising take center stage

OpenAI began experimenting with ads in ChatGPT in February 2026. By May, an average of 17% of daily users were being served ads. Software and shopping are the largest advertiser categories so far, followed by media and entertainment and food and dining. As ChatGPT deepens its shopping integrations, it is increasingly sending referral traffic to retailers like Target, Walmart, and Costco. Amazon, which has blocked ChatGPT’s web crawlers, has seen stagnant referral traffic from the platform as a result, creating an opening for competitors.

Walmart has embedded its own AI assistant, Spark, which has been gaining ground. Sensor Tower also noted that Amazon shoppers who used its Rufus assistant spent more time in the app and converted at higher rates than those who did not, hinting that on-platform AI can meaningfully influence purchasing behavior when users actually engage with it.

User engagement and retention metrics

Across platforms, average revenue per user has grown industry-wide, but Claude stands out. Thirteen percent of Anthropic’s users are paying for a subscription plan — a conversion rate that leads the field. This metric will be worth watching for investors evaluating which AI businesses are building lasting revenue. Sensor Tower estimates that hours spent on AI apps will increase from 17.2 billion hours in H1 2025 to roughly 36 billion hours in H1 2026.

Meanwhile, adjacent categories like AI companions and AI content-generation apps remain fragmented and wide open to competition, representing both a risk and an opportunity depending on which players move first.

Conclusion

The AI assistant market is entering a new phase characterized by intense competition, user migration, and a focus on monetization. ChatGPT’s slipping market share is not a sign of decline but rather a natural evolution as alternatives like Gemini and Claude carve out their own niches. For users, this means more choice and better features. For companies, the challenge is no longer just about building a better chatbot — it is about earning and keeping user trust while building sustainable revenue models.

FAQs

Q1: Why did ChatGPT’s market share drop below 50%?
Sensor Tower’s report indicates that users are increasingly switching between AI assistants based on trust, integration with existing tools, and specific use cases. Events like OpenAI’s DoD deal also triggered uninstalls.

Q2: Which AI assistant is growing the fastest?
Google’s Gemini has seen significant growth, reaching 27.7% market share, largely due to its integration with Google’s ecosystem. Claude has also gained ground, especially for productivity tasks.

Q3: How are AI companies making money?
OpenAI has started showing ads in ChatGPT, with 17% of daily users seeing ads by May. Subscription plans are also key — Claude leads with a 13% conversion rate to paid plans. In-app spending is expected to reach $4.2 billion in H1 2026.

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