Research

Original research on AI search and SEO

We measure how ChatGPT, Perplexity and Google's AI answers choose and cite sources, and what that means for AEO, SEO and traffic. Each study publishes its sample and method.

Question 1

How do AI engines choose their sources?

Where the evidence pointsOn Perplexity, a page's place in the retrieved list predicts citation more than anything on the page itself.

Study
Headline number
Key takeaway
Perplexity ranking factors
Published 18 Oct 2026
Headline number
89%
of sources retrieved first get cited, against 29% at tenth
Key takeaway

Getting into Perplexity's top retrieved results matters more than tuning the page.

AI engines studied
Perplexity
Perplexity, Sonar and Sonar Pro
Sample

1,282 answers and 12,805 sources, 16 brands, Sep to Oct 2026

Also found
48%
of top-three pages had a table, against 39% in the bottom three
66%
of government sites were cited when retrieved, against 53% overall
Question 2

Where does AI traffic show up in analytics?

Where the evidence pointsNot in Direct. The Direct growth we measured was bots, and real AI clicks arrive as referrals.

Study
Headline number
Key takeaway
Is AI hiding in Direct?
Published 22 Oct 2026
Headline number
0
of 489,920 Direct sessions carried an AI trace
Key takeaway

Don't read Direct growth as hidden AI traffic. Filter out bots before reading any trend.

AI engines studied
ChatGPT
Gemini
Claude
Perplexity
Copilot
ChatGPT, Gemini, Claude, Perplexity and Copilot, as referral sources
Sample

10 sites, GA4 and Search Console, Jan 2025 to Oct 2026

Also found
+164%
total Direct from August to September, while engaged Direct rose 15%
6.3%
of Direct is the most AI could be hiding, against Ramp's 30 to 40%
Question 3

Which platforms do AI answers lean on?

Where the evidence pointsIt depends on the engine. YouTube is a Google AI source and almost absent everywhere else.

Study
Headline number
Key takeaway
YouTube in AI answers
Published Oct 2026
Headline number
31%
of Google AI Overviews cite a YouTube video
Key takeaway

Video earns AI citations on Google's engines. Elsewhere it barely registers.

AI engines studied
Google
Gemini
Perplexity
ChatGPT
AI Overviews, AI Mode, Gemini, Perplexity and ChatGPT
Sample

6,684 AI answers across 5 engines

Also found
0
of 1,363 ChatGPT answers cite YouTube
97%
of cited videos come from third-party channels, not the brands discussed

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