AI Search Engine Statistics 2026: Usage, Market Share and Adoption

ChatGPT reached 900 million weekly active users, up from 800 million weekly active users in October 2025. Over the same stretch, Google AI Overviews grew to more than 2 billion monthly users. The headline numbers point one way. The referral data points the other.

Key Takeaways

• ChatGPT crossed 900 million weekly active users, a jump of 100 million in roughly four months, according to OpenAI.
• Google AI Overviews reached over 2 billion monthly users, up from 1.5 billion the prior quarter.
• Gemini web visits grew roughly 9x between September 2024 and March 2026, against ChatGPT’s 84%, according to Similarweb.
• Searches showing an AI summary sent a click in about 8% of visits, nearly half the 15% rate without one, according to Pew Research.
• AI-referred traffic to US retail sites rose 393% year over year in the first quarter of 2026, according to Adobe.
• AI traffic converted 42% better than non-AI traffic in March 2026, reversing a 38% deficit a year earlier.
• Gartner projects traditional search engine volume will drop 25% by 2026 as answer engines absorb queries.

Editor’s Choice

• Perplexity processed 780 million queries in May, about 30 million per day.
• Gemini’s app monthly active users grew over 1,100% from September 2024 to March 2026.
• OpenAI reported 50 million paying ChatGPT subscribers alongside the weekly-user milestone.
• Only 1% of visits to a page with an AI summary included a click on a link inside that summary.
• AI Overviews are driving over 10% more queries globally for the query types that show them.
• AI-driven revenue per visit ran 37% higher than non-AI traffic in March.

AI Search Engine Usage Statistics

• OpenAI reported 50 million paying ChatGPT subscribers alongside its weekly-user milestone.
• ChatGPT‘s weekly user base climbed from 800 million in October 2025 to its current level in roughly four months.
• Google AI Overviews span more than 200 countries and territories and 40 languages.
• AI Overviews added roughly 500 million monthly users in a single quarter.
• Google is expanding Personal Intelligence in AI Mode to nearly 200 countries and 98 languages.
• Perplexity served about 30 million queries per day in May.
• Perplexity was growing more than 20% month over month at that point.

Source: OpenAI, Google, Alphabet, Perplexity (2025-2026)

Traditional query benchmarks set the baseline these AI surfaces are eroding, and our Google search statistics page tracks that blue-link volume in detail.

AI Chatbot Web Traffic Growth by Platform

• ChatGPT web visits grew 84% between September 2024 and March 2026.
• Gemini web visits grew roughly 9x across the same window.
• Claude web visits grew roughly 770% over the period.
• ChatGPT app monthly active users grew roughly 156% between September 2024 and March 2026.
• Gemini’s app monthly active users grew over 1,100% in the same span.
• Claude’s app monthly active users roughly tripled between January and March 2026 alone.

Source: Similarweb Generative AI Statistics 2026

Key finding: Similarweb data shows Gemini web visits grew roughly 9x and its app users over 1,100% between September 2024 and March 2026, dwarfing ChatGPT’s 84% web growth. Google’s native distribution across Search, Android, and Workspace, not a better chatbot, explains most of that gap.

Our AI benchmark coverage shows capability rankings shift often while public perception lags well behind. That same lag now shapes how people rate these search tools. Our Claude vs ChatGPT usage data tracks their adoption curves head to head.

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Recent Developments

• May 2026: Google announced at I/O that AI Mode had surpassed one billion monthly users.
• February 2026: OpenAI reported ChatGPT had reached 900 million weekly active users.
• March 2026: Adobe found AI-referred retail traffic converted 42% better than non-AI traffic.
• First quarter of 2026: Adobe measured a 393% year-over-year jump in AI traffic to US retail sites.
• March 2026: Similarweb reported ChatGPT web visits up 84% and Gemini up roughly 9x since September 2024.

Google AI Overviews and AI Mode Adoption

• AI Overviews reached over 2 billion monthly users across more than 200 countries.
• That figure rose from 1.5 billion users the previous quarter.
• AI Mode passed one billion monthly users about one year after its debut.
• AI Mode queries have been more than doubling every quarter since launch.
• AI Overviews are driving over 10% more queries globally for query types that show them.
• Google is bringing Personal Intelligence in AI Mode to nearly 200 countries and 98 languages.

Source: Google, Alphabet Q2 2025 earnings (2025-2026)

Two forces pull in opposite directions here. The same distribution that put AI answers in front of billions of people also decides whether they ever leave the results page.

AI Search Query Volume and Momentum

• Perplexity handled 780 million queries in May.
• That volume equated to about 30 million queries per day.
• Perplexity’s single-day volume was 3,000 queries on its first day in 2022.
• The company was compounding at more than 20% month over month.
• AI Mode queries have more than doubled every quarter since the feature launched.

Perplexity’s disclosed query figures date to mid-2025, before its later agent-product expansion.

Perplexity’s rise from a single day’s handful of queries to tens of millions daily shows how fast a pure answer engine can scale. That conversational-AI momentum echoes the adoption our Character AI statistics breakdown tracks across chatbot platforms.

How AI Overviews Change Click Behavior

• Pew Research analyzed the browsing data of 900 US adults across 68,879 unique Google searches in March 2025.
• Some 18% of all searches in the study generated an AI summary.
• About 58% of respondents ran at least one search that produced an AI summary.
• Of the searches studied, 12,593 produced an AI summary.
• Users ended their session on 26% of pages with an AI summary, versus 16% of pages without one.

By the numbers: Pew Research found that searches with an AI summary sent a click just 8% of the time, against 15% without one, while only 1% of AI-summary pages produced a click on a link inside the summary. Reach is scaling faster than referrals, which reshapes the economics for every publisher quoted without a visit.

AI Search Referral Traffic and Conversion

• AI-referred traffic to US retail sites rose 393% year over year in the first quarter of 2026.
• As of March, that traffic was up 269% over the previous 12 months.
• AI visitors spent 48% longer on retail sites than non-AI visitors.
• AI visitors browsed 13% more pages per visit.
• AI shoppers showed an engagement rate 12% higher than non-AI sources.
• AI-driven revenue per visit ran 37% higher than non-AI traffic as of March 2026.

Why it matters: Adobe Analytics found AI traffic converted 42% better than non-AI traffic in March 2026, a full reversal from March 2025 when the same traffic converted 38% worse. AI search visitors did not just grow more numerous; they arrived with sharper intent, which is why referral value rose even as raw click rates fell.

AI Shopping and Consumer Adoption

• In Adobe’s survey, 39% of people said they had used AI for online shopping.
• Among those users, 85% said AI improved their shopping experience.
• About 66% of respondents said they now believe AI tools return accurate results when shopping.
• AI traffic converted 42% better than non-AI traffic in March 2026.

Consumer trust and behavior move together across our coverage. The same engagement-over-growth pattern we document in social platform data now appears in AI shopping, where deeper sessions matter more than raw visit counts. Readers tracking how AI tooling spreads through consumer apps can compare this with our AI in social media tools statistics.

The Decline of Traditional Search Volume

• Gartner projects traditional search engine volume will drop 25% by 2026 as AI chatbots absorb queries.
• Gartner frames generative AI tools as substitute answer engines replacing queries once run on traditional search.
• The shift is visible in behavior, with link clicks nearly halving to about 8% from 15% when an AI summary appears.

Gartner’s Alan Antin argues that as answer engines spread, brands relying on search will need unique, expertise-led content that continues to demonstrate experience and trustworthiness. That advice tracks the browser-level shift our web browser usage statistics capture, where the entry point to the web keeps fragmenting.

Is AI search replacing Google?

AI search is reshaping Google rather than replacing it. Google’s AI Overviews reached over 2 billion monthly users. Its AI Mode has moved past one billion monthly users. So the query volume Gartner expects to leave traditional blue links is largely migrating into Google’s own AI features rather than away from the company.

Which AI search engine is growing fastest?

By growth rate, Gemini leads. Similarweb data shows Gemini web visits grew roughly 9x and app users over 1,100% between September 2024 and March 2026, against ChatGPT’s 84% web growth. Perplexity grew more than 20% month over month from a base of 780 million monthly queries.

Conclusion

AI search moved from novelty to mass channel this year. ChatGPT reached 900 million weekly users, Google AI Overviews passed more than 2 billion monthly users, and Gemini web traffic grew roughly 9x in eighteen months. The usage curve is no longer the interesting part.

The tension now sits between reach and referral. Pew’s finding that AI summaries nearly halve link clicks, to about 8% from 15%, collides with Adobe’s data that AI visitors who click convert 42% better than non-AI traffic. Publishers and retailers now face fewer AI-driven sessions of higher value. The practical read for the current year is to optimize for AI visibility and intent quality over raw click volume.