AI tools now beat search engines at every stage of the purchase journey — discovery, research, and buying. The data from Similarweb is unambiguous: the consumer funnel has shifted, and search is losing at the top where it used to dominate.
Similarweb’s US Market Research Panel (January 2026) asked people who use both AI tools and search engines: at which stage of the purchase journey is each most useful?
AI wins at every stage — but the gap is largest where it matters most:
Discovery — AI Wins 2.6x
35% vs 13.6% — The Top of Funnel Has Moved
“Discovering / getting initial ideas” — the stage where search engines built their entire business — now belongs to AI. 35% of users prefer AI tools for discovery vs. 13.6% for search. That’s a 2.6x gap at the exact point where Google’s ad revenuemodel depends on being the first touch.
Research — AI Wins 1.5x
30% vs 20% — Comparison Shopping Is AI-Native Now
“Researching / comparing options” — the mid-funnel where affiliate sites, review blogs, and SEO content thrived. AI tools synthesize comparisons in seconds. The 10-tab comparison research session is being replaced by a single prompt.
Buying — Nearly Tied
24.3% vs 22.1% — The Transaction Layer Is Contested
“Finding where to buy / the best price” — search still has Amazon, Google Shopping, and price comparison built in. But AI is closing even here, at 24.3% vs 22.1%. When AI agents start transacting directly, this gap widens fast.
The key insight: AI doesn’t just win at discovery — it wins by 2.6x. The top of the purchase funnel, where Google built a $300 billion advertising business, is the stage where AI’s advantage is most decisive. This is not a threat to Google’s future. It is a threat to Google’s present.
The Structural Read
This data explains everything happening in the content economy right now. Less than a third of Google searches send a click. FWMBA’s traffic dropped from 128K to 45K sessions. Affiliate revenue is collapsing across the industry. The reason is in this chart: consumers have moved the discovery and research stages of their purchase journey to AI tools.
The implications cascade across every business that depends on search traffic:
SEO CONTENT IS LOSING ITS BUYER
The entire SEO content industry was built on capturing people during discovery and research. If 35% of discovery now happens in AI and only 13.6% in search, the addressable market for SEO content has contracted by more than half at the top of the funnel.
THE NEW DISCOVERY CHANNEL IS AI CITATIONS
If consumers discover products and ideas through AI, the brands that get cited by ChatGPT, Claude, and Perplexity are the ones that capture the top of funnel. This is why AI citation optimization — being the source AI models reference — is the new SEO.
GOOGLE’S AD MODEL IS STRUCTURALLY THREATENED
Google’s advertising revenue depends on being the first touch in the purchase journey. If AI now owns first touch at 35% vs 13.6%, Google is losing the auction before it starts. AI Overviews are Google’s attempt to recapture this — but the data suggests consumers prefer standalone AI tools.
The Bottom Line
The purchase funnel has moved. AI tools beat search at discovery (2.6x), research (1.5x), and even buying (1.1x). For any business built on search traffic — publishers, affiliate sites, e-commerce, SaaS with SEO-driven acquisition — this is the structural shift to plan around. The consumer didn’t stop researching before buying. They just stopped using Google to do it.
Business Engineer Framework
The AI Supercycle — How Distribution Shifts When AI Owns Discovery
Gennaro is the creator of FourWeekMBA, which reached about four million business people, comprising C-level executives, investors, analysts, product managers, and aspiring digital entrepreneurs in 2022 alone | He is also Director of Sales for a high-tech scaleup in the AI Industry | In 2012, Gennaro earned an International MBA with emphasis on Corporate Finance and Business Strategy.
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