ChatGPT Market Share 2026: Now Below 50% for First Time

ChatGPT market share in 2026: the short version

ChatGPT market share in 2026 dropped below 50% for the first time, landing at 46.4% of the global AI assistant market by the end of May, according to Sensor Tower's State of AI 2026 report. Google Gemini climbed to 27.7% and Anthropic's Claude reached 10.3%. ChatGPT is still the runaway leader by raw size, with more than 1.1 billion monthly active users, but its share of the category has been sliding for a year and a half. The story isn't a collapse. It's the end of a near-monopoly and the start of a real three-way race.

Last updated: June 22, 2026

For two years, "AI assistant" basically meant ChatGPT. That shorthand is breaking. The report Sensor Tower published on June 16, 2026 puts a number on a shift plenty of people had already felt: the field now has three serious contenders, and the gap between first place and the chasing pack is closing faster than at any point since ChatGPT launched.

What the numbers actually say

First, a precision check, because this story gets garbled fast. The 46.4% figure is Sensor Tower's True Audience metric, a deduplicated count of unique users across mobile apps, mobile web, and desktop web, limited to AI assistant apps. It is not website-visit share, not revenue, and not a quality ranking. Trackers that count only web traffic report higher ChatGPT numbers, often above 50%, because they measure a different thing. When you see an AI market-share stat, the two questions that matter are which metric and which month.

With that settled, here is the global AI assistant market as of the end of May 2026.

ProviderMarket share (May 2026)Change vs prior periodMonthly active usersChatGPT (OpenAI)46.4%Down from 52.8% (Dec 2025)~1.1 billionGemini (Google)27.7%Up from 18.2% (Dec 2024)662 millionClaude (Anthropic)10.3%Up from ~3% (Dec 2025)245 millionGrok (xAI)3.3%Rising~50–64 millionDeepSeek3.2%Volatile—Perplexity2.8%Rising~45 millionMeta AI2.5%Flat (standalone app)—Microsoft Copilot1.6%Flat—

A few things jump out of that grid.

ChatGPT's decline is gradual, not sudden. Its share was 65.3% in December 2024, 52.8% in December 2025, and 46.4% by May 2026. It crossed under the 50% line in March 2026 and has stayed there. So this is a slow erosion measured over 18 months, not an overnight drop.

The top three own almost everything. ChatGPT, Gemini, and Claude together account for roughly 84% of the assistant market. By time spent rather than users, concentration is even tighter: ChatGPT, Gemini, and DeepSeek made up nearly 90% of all time spent across AI assistant apps in Q1 2026. After the leaders, no one holds more than about 3.3%.

And "losing share" does not mean "losing users." ChatGPT is still growing in absolute terms. It became the fastest app in history to reach one billion monthly active users, hitting the milestone in roughly three years, faster than TikTok, Instagram, or YouTube. Its slice of the pie is shrinking only because the pie is growing faster than ChatGPT can capture, and rivals are catching the new growth. Global time spent on generative AI apps is on track to more than double year over year, from about 17.2 billion hours in the first half of 2025 to roughly 36 billion hours in the first half of 2026.

Why Gemini is gaining on ChatGPT

The ChatGPT vs Gemini market-share gap narrowed for one reason above all others: distribution. Gemini went from 533 million monthly users in December 2025 to 662 million in May 2026, a gain of 129 million in five months. That is not mainly a story about a smarter model. It is a story about where the model already lives.

• Android at the OS level. Gemini now sits inside the operating system on the world's most-used mobile platform, taking over the slot Google Assistant used to fill. On a planet with billions of Android phones, that is default placement no rival can buy.
• The Google ecosystem. Gemini is wired into Search, Gmail, Google Docs, and Workspace. For people who already live in those apps, using Gemini is a tap, not a download. That kind of integration is an architectural advantage, not a feature a competitor can bolt on.
• Pricing and reach. A capable Gemini tier ships free to a vast Google account base, and the assistant is expanding fastest in markets where Android dominates, including parts of Europe and Asia. Where most phones are Android, Gemini gets in front of users essentially for free.

None of this requires Gemini to be "better" than ChatGPT in a head-to-head. It just has to be good enough and already present. For a default-driven product category, present usually wins.

Where Claude fits: small share, outsized influence

Claude market share looks modest at 10.3%, but the trajectory is the loudest signal in the report. Claude was around 3% at the end of 2025 and grew to 10.3% by May 2026, a 452% year-over-year jump that makes it the fastest-growing major assistant of the year. In the US specifically, its share roughly tripled, from about 4.4% to nearly 14%.

The more interesting part is who uses it and how much they pay. Claude built its reputation on coding and long-document work, and it shows up disproportionately among developers and enterprise teams. Sensor Tower pegs Claude's paid conversion rate near 13%, the highest of any assistant it tracks and well above the 2 to 5% typical for consumer software. In the US, Claude's mobile average revenue per user climbed from under $0.50 in September 2025 to $2.76 by May 2026, roughly 1.5 times ChatGPT's figure.

That combination, a smaller but heavily monetized and technically skewed user base, is why Claude punches above its 10.3%. It is the assistant people pay for and the one professional tooling tends to build on, even if casual users still reach for ChatGPT or Gemini first.

It also explains why Claude's strategy looks different from Google's. Google is chasing reach through defaults; Anthropic is chasing depth through developers. A lot of Claude's real volume never touches the consumer app at all, flowing instead through enterprise API usage on platforms like Amazon Bedrock and Google Cloud's Vertex AI. So the 10.3% consumer-assistant share understates Claude's footprint in the parts of the market where money and code actually move. That is a useful reminder that share of attention and share of value are not the same chart.

The smaller players, in context

Below the top three, the market fragments into single digits, and the headline numbers can mislead if you don't read them carefully.

• Grok (xAI), ~3.3%. Grok is tightly bound to X and leans into a less-filtered, more conversational style. It is growing, but its footprint is still a fraction of the leaders.
• DeepSeek, ~3.2%. The Chinese open-weight challenger remains a heavyweight by time spent, which is why it appears in the top three on that specific metric even with a small user share. Its usage skews regionally and can swing month to month.
• Perplexity, ~2.8%. Perplexity competes more as an answer engine than a chatbot, with citations and live web results. It has a devoted base of around 45 million monthly users but a niche overall share.
• Meta AI, ~2.5%. This is the trickiest line in the table. Meta AI reaches well over a billion people through WhatsApp, Instagram, Facebook, and Messenger, but most of that is incidental, baked into apps users opened for other reasons. As a standalone assistant, its share is small.
• Microsoft Copilot, ~1.6%. Copilot is everywhere in Windows and Microsoft 365 and counts hundreds of millions of touchpoints plus a fast-growing base of paid enterprise seats. In the consumer assistant category measured here, though, it ranks last among the named players.

The lesson: distribution inflates reach but not necessarily category share. Meta AI and Copilot prove you can put an assistant in front of a billion people and still hold a low single-digit slice of the standalone market, because availability is not the same as the deliberate choice to open an assistant.

What this means for you

The practical takeaway is not "abandon ChatGPT." It is that the era of one obvious default is over, and that is good for anyone who uses these tools.

• More competition means better free tiers. Three well-funded rivals fighting for share tend to give away more, not less. Expect stronger free options and faster feature releases as the leaders trade blows.
• Match the tool to the job. Gemini is the natural pick if you live on Android and inside Gmail, Docs, and Search. Claude is the one to try for coding, technical work, and long documents. ChatGPT remains the broad all-rounder with the deepest ecosystem of plugins and integrations. You no longer have to commit to just one.
• "Best" is now contested, which helps you. When no single assistant is the default answer, you can shop on quality and price for your specific use case instead of defaulting to whatever everyone else uses.

If your interest in this race is practical rather than academic, the most useful move is to actually put these models to work. Drafting blog posts, summaries, and outlines is one of the most common everyday jobs people hand to an AI assistant, and you can do it on RunFreeTools without juggling logins across providers. Our free AI Blog Writer turns a topic into a structured draft in your browser, and once you have content, the AI Content Detector helps you check how it reads. For the wider set of free AI utilities, the AI tools category groups writing, summarizing, and other assistants by the task you are trying to finish.

What to watch next

A market this dynamic does not sit still, so a few things are worth tracking through the rest of 2026. Whether ChatGPT stabilizes near 46% or keeps sliding as Gemini's distribution compounds. Whether Claude's growth curve holds or cools as the easy enterprise wins get harder. And whether any smaller player, Grok especially, breaks out of the single-digit pack. Sensor Tower updates these figures regularly, so treat the May 2026 snapshot as a frame in a film, not the final scene.

Key takeaways

• ChatGPT market share in 2026 fell below 50% for the first time, to 46.4% in May, down from 52.8% in December 2025 and 65.3% in December 2024 (Sensor Tower True Audience metric).
• Gemini reached 27.7% (662 million users) on the back of Android and Google ecosystem distribution; Claude hit 10.3% (245 million users), up 452% year over year.
• ChatGPT is still the leader by far, with over 1.1 billion monthly active users, and became the fastest app ever to one billion. It is losing share, not users.
• The top three control roughly 84% of the assistant market; below them, no player holds more than about 3.3% (Grok, DeepSeek, Perplexity, Meta AI, Copilot).
• Always check the metric: 46.4% is unique-user share of AI assistant apps, which differs from web-traffic or revenue figures.
• For users, the upshot is more competition, better free tiers, and the freedom to match the tool to the task instead of defaulting to one provider.