ChatGPT fell to 46.4 % share as Gemini and Claude gained ground

Sensor Tower says ChatGPT's share of the AI assistant market fell to 46.4 % by the end of May 2026. ChatGPT still remains the largest player with more than 1.1 billion monthly users. Gemini has 662 million and Claude has 245 million.

Sensor Tower puts ChatGPT below the psychological line

TechCrunch cites Sensor Tower's State of AI Report 2026, which says ChatGPT still held more than half the market in January. By the end of May it had fallen to 46.4 %, while Gemini reached 27.7 % and Claude reached 10.3 %. Other assistants including Grok, Perplexity, DeepSeek and Meta AI are each under 5 %, according to the report.

This is not a story about usage collapsing. ChatGPT has more than 1.1 billion monthly users, and OpenAI previously reported 900 million weekly active users. The market is not moving in one direction. The leader is still growing, but rivals are taking a larger share of attention.

Default distribution is catching up with first-mover advantage

Gemini benefits from what Google does best: distribution through its own ecosystem. If an AI assistant shows up in search, Android or work tools, part of adoption happens without a separate user decision.

Claude is a different case. Its 10.3 % share is smaller, but Sensor Tower says, according to TechCrunch, that 13 % of Anthropic users pay for a subscription, the highest conversion rate in the category. For investors and product teams, that is a harder signal than visits alone. It shows what people will pay for.

Share loss does not mean the product is weakening

The 46.4 % number invites a simple story about dominance fading. A more careful read is better: ChatGPT is moving from the icon of the whole category to the largest product in a normally competitive market.

That nuance matters for companies choosing an AI stack. It is no longer safe to assume one assistant will be the natural default for every task. Employees will move between tools based on answer quality, integration, price, brand trust and where their data already lives.

Monetization will decide who turns attention into business

Sensor Tower estimates AI apps are on pace for nearly 2.3 billion downloads and more than 4.2 billion dollars in consumer spending in the first half of 2026. TechCrunch also says ads reached an average of 17 % of daily users in May.

The next phase is not only about user counts. It is about who can combine distribution, retention, paid conversion and ads without turning the assistant into an annoying billboard.

Lilith's verdict

ChatGPT still holds the biggest megaphone, but it no longer owns the whole square. The AI assistant market matured the moment users started choosing by the job, not the logo on the landing page.