ChatGPT's sizable lead in the world of AI assistants is slipping, bit by bit.
Analytics firm Sensor Tower released its annual State of AI report (as cited by TechCrunch) this week, which contained the news that OpenAI's flagship chatbot no longer has a majority of market share in the AI space. As recently as January, ChatGPT still had more than 50 percent of total AI market share, but now, it's down to 46.4 percent, per Sensor Tower.
Let's put it this way: In a multi-candidate election, ChatGPT would still win by a landslide, but this is a sign that other AI tools are gaining momentum. Namely, Google Gemini is up to 27.7 percent, while Anthropic's Claude is up to 10.3 percent. Earlier this year, Anthropic even reported it was seeing a million new users every day. Other AI chatbots, including Grok and Meta AI, has less than 5 percent market share.
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Even with its slight dip from majority to plurality, ChatGPT seems to be doing quite well. Sensor Tower said it has 1.1 billion monthly users, with Gemini fairly far behind it in that metric, with 662 million monthly users. As Gemini starts working its way into everyday devices and services, like Apple's new Siri AI coming later this year, that number could grow even further.
In another troubling sign for OpenAI, Microsoft recently indicated it may go with the lower-cost Chinese model DeepSeek to power some enterprise AI tools.
Lastly, don't forget that OpenAI is prepping for a possible IPO later this year. Declining market share is unlikely to improve its prospects in the market.
Disclosure: Ziff Davis, Mashable’s parent company, in April 2025 filed a lawsuit against OpenAI, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.