A long citation list can draw repeatedly from one website rather than several independent sources. We wanted to distinguish the number of cited pages from the breadth of websites behind them.

We grouped citation links by hostname within answers from ChatGPT Search and Google AI Mode during September 28–October 4, 2026. We measured repetition among answers citing at least two pages. Historical comparisons below keep their own dates and methods.

Yes. Among answers citing at least two pages, 70.5% of ChatGPT Search answers and 28.8% of Google AI Mode answers repeated a hostname. Count the pages and the sources behind them: they tell you different things.

Several citations can come from one source

ChatGPT Search repeated a hostname in 26,831 of 38,079 answers with at least two cited pages. Google AI Mode did so in 9,338 of 32,420. This September 28–October 4 comparison counts different pages from the same hostname, not repeated inline references to the same page.

ChatGPT Search70.5%
Google AI Mode28.8%
0%20%40%60%80%

Repeat-hostname rate among answers citing at least two pages · September 28–October 4, 2026.


ChatGPT Search	38,079	26,831	70.5
Google AI Mode	32,420	9,338	28.8

September 28–October 4, 2026 · denominator: answers with at least two distinct cited pages.

Page counts and source counts belong together

Across all answers with citations in the weekly panel, ChatGPT Search averaged 6.6 page links from 4.7 hostnames. Google AI Mode averaged 3.7 links from 3.3 hostnames. The difference shows how several pages from one host can lengthen a citation list.

Links and hostnames per cited answer


Google AI Mode	3.72	3.33
ChatGPT Search	6.64	4.69

September 28–October 4, 2026 · 23,748 questions with recorded citations on both engines; 75,437 answers with citations. Hostnames and recorded URL variants remain separate.

Repeated pages can add detail without adding an independent voice

A vendor’s documentation, pricing page and product comparison may each contribute something useful. Together, they can explain a product well. They still represent one vendor’s account.

Look at what each page adds. For a disputed claim or a competitive comparison, check whether the answer also includes an independent source. A hostname count alone cannot establish independence because one publisher may operate several sites.

Longer lists have more room for repeats

The older May 24–July 23 study found repeated registered websites in 14.8% of answers with two or three links, compared with 87.7% of answers with eleven or more. The useful lesson is to compare answers with similar list lengths.

That historical study grouped subdomains into registered websites. The weekly study uses hostnames, and its engine rates should not be treated as a continuation of the older series.

Repeated-website rate by citation-list size

2–3 page links14.8%10,361 of 70,002
4–6 page links36.0%33,163 of 92,076
7–10 page links64.7%60,769 of 93,977
11 or more page links87.7%147,153 of 167,866
0%50%100%

Historical study, May 24–July 23, 2026 · repeated registered websites within each citation-list size. This is a different grouping rule from the current hostname comparison.

Use both measures in a source audit

Use page counts to find useful content and hostname counts to see where evidence is concentrated. Open the repeated pages before deciding whether they add detail or repeat the same claim. This gives a content team a better next step than treating every citation as another endorsement.

How to find citation gaps between your brand and competitors

Study scope

Each stored answer/page/hostname link counts once. Search-result wrappers are excluded. Answers without recorded citations are outside the panel; hostnames preserve subdomains and page counts preserve URL variants.

The repeat rate uses only answers with at least two distinct cited pages. Page and hostname averages use all answers with citations. The original registered-website study remains in a separate dated download.

How we measured

We compared 393,201 recorded citation links in 75,437 answers with citations to 23,748 organic questions on ChatGPT Search and Google AI Mode, September 28–October 4, 2026. Historical comparisons below retain their own dates and methods.

ChatGPT Search answers repeated a hostname: 70.5%
26,831 of 38,079 answers citing at least two pages
Google AI Mode answers repeated a hostname: 28.8%
9,338 of 32,420 answers citing at least two pages

Get the data

Original study datasetUnderlying figures for the original study window. The October follow-up is available separately.

October repeated-hostname follow-upCited-answer and multi-page denominators, repeat-host counts, and list lengths.

Sources

Ahrefs: Why ChatGPT cites one page over another, a study of 1.4 million prompts · accessed July 24, 2026
Semrush: The most-cited domains in AI, a three-month study · accessed July 24, 2026
Answer Bubbles: Information Exposure in AI-Mediated Search · accessed July 24, 2026

Can one page earn AI citations for many questions?

Most cited pages appeared for just one buyer question in our sample.

Does AI attach one cited page to multiple brands?

AI sometimes attached the same cited page to several recommended brands within one answer.

ChatGPT Search vs Google AI Mode: different sources for buyer questions

Microsoft Learn received the most citation links on ChatGPT Search; YouTube led on Google AI Mode in our weekly study.

Most-cited domains in AI answers: compare sources by engine

The leading sources differed by engine: Microsoft Learn led ChatGPT Search's citation volume, while YouTube led Google AI Mode's.

Do ChatGPT and Google cite the same page?

Even when both engines cited the same website for the same question, they usually chose different pages.

What pages does AI cite most? Look at the buyer question

Product pages, practical guides and comparisons featured among citation leaders. The mix depended on the buyer's question.

Does AI cite brand homepages?

Most citations to a brand's own website pointed to a deeper page, rather than its homepage.