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Research/ChatGPT Search vs Google AI Mode: same brands, different sources

ChatGPT Search vs Google AI Mode: same brands, different sources

The two newest AI search surfaces do not read the same web. On the same 18,206 prompts, ChatGPT Search and Google AI Mode share only 6.2% of cited sources per prompt, while sharing 27.6% of named brands.

By Dimitry Apollonsky · July 8, 2026 · updated September 7, 2026 · 8 min read

Overlap on matched prompts
  • Named brands27.6%
  • Cited sources6.2%
The engines are much closer on the brands they name than on the sources they cite.
▸Contents
  • The engines agree more on brands than on sources
  • Google AI Mode is the source-heavy surface
  • The top sources are different lists
  • YouTube is an AI Mode source, not a ChatGPT Search source
  • AI Mode leans into social platforms and video
  • What we stopped counting: Google's own result pages and redirect wrappers
  • ChatGPT Search leans more toward vendor and specialist pages
  • The top brands mostly overlap anyway
  • The gap in how much each engine cites held every week
  • The new surfaces split sources harder than the old pair
  • The operating rule: split source work by surface
  • Get the data
  • Sources
  • Related research
Contents
  • The engines agree more on brands than on sources
  • Google AI Mode is the source-heavy surface
  • The top sources are different lists
  • YouTube is an AI Mode source, not a ChatGPT Search source
  • AI Mode leans into social platforms and video
  • What we stopped counting: Google's own result pages and redirect wrappers
  • ChatGPT Search leans more toward vendor and specialist pages
  • The top brands mostly overlap anyway
  • The gap in how much each engine cites held every week
  • The new surfaces split sources harder than the old pair
  • The operating rule: split source work by surface
  • Get the data
  • Sources
  • Related research

We compared 18,206 matched prompts, meaning the same prompts run on both ChatGPT Search and Google AI Mode, from May 24 to June 25, 2026, covering 221,278 answers, 1,845,188 citations, and 35 industry groups, with search-engine redirect wrappers and links back into Google's own result pages excluded.

6.2%
average cited-source overlap per prompt
27.6%
average named-brand overlap per prompt
13.3 vs 3.7
references cited per answer
AI Mode vs ChatGPT Search
18,206
matched prompts

The engines agree more on brands than on sources

ChatGPT Search and Google AI Mode do not read the same set of sources. On identical prompts, the average cited-source overlap is just 6.2%. The average named-brand overlap is 27.6%.

Overlap here is the share of a prompt's combined set that both engines have in common, averaged over the 18,206 matched prompts. That means the engines often arrive at a similar shortlist through different evidence. Optimizing for AI search as one blended channel misses the real difference: brand presence and source presence are diverging.

6.2%
Cited-source overlap
27.6%
Named-brand overlap
2.9
Shared domains per prompt

Takeaway

The split is not only ChatGPT versus Google. The two engines agree on the answer and disagree on the evidence.

Google AI Mode is the source-heavy surface

Google AI Mode cited at least one source in 98.7% of answers and averaged 13.3 references per answer. ChatGPT Search cited in 65.7% of answers and averaged 3.7 references. Per prompt, AI Mode exposed 42.2 distinct domains versus 11.9 on ChatGPT Search.

  • AI Mode: references per answer13.3
  • ChatGPT Search: references per answer3.7
  • AI Mode: domains per prompt42.2
  • ChatGPT Search: domains per prompt11.9
How much each surface cites.

The top sources are different lists

ChatGPT Search starts with Reddit, then tech-review, academic, news, encyclopedia, and developer sources. Google AI Mode starts with YouTube, Reddit, LinkedIn, Facebook, Medium, and Instagram. Reddit is the only source in both top three.

Top cited sources by surface
1reddit.com faviconreddit.com7.11youtube.com faviconyoutube.com5.32
2techradar.com favicontechradar.com1.34reddit.com faviconreddit.com4.37
3arxiv.org faviconarxiv.org1.03linkedin.com faviconlinkedin.com1.1
4forbes.com faviconforbes.com0.6facebook.com faviconfacebook.com1.08
5en.wikipedia.org faviconen.wikipedia.org0.52medium.com faviconmedium.com1
6github.com favicongithub.com0.32instagram.com faviconinstagram.com0.7

YouTube is an AI Mode source, not a ChatGPT Search source

The largest individual split is YouTube. It supplies 5.3% of Google AI Mode citations and only 0.11% of ChatGPT Search citations, about a 50x lean toward AI Mode. Facebook shows an even larger lean, while TechRadar and arXiv lean hard toward ChatGPT Search.

Sources with the largest surface lean
facebook.com faviconfacebook.com0.0161.077Google AI Mode~66x1
techradar.com favicontechradar.com1.3420.025ChatGPT Search~54x2
youtube.com faviconyoutube.com0.1065.315Google AI Mode~50x3
arxiv.org faviconarxiv.org1.0280.105ChatGPT Search~10x4
linkedin.com faviconlinkedin.com0.1311.097Google AI Mode~8x5
en.wikipedia.org faviconen.wikipedia.org0.5190.074ChatGPT Search~7x6

AI Mode leans into social platforms and video

Google AI Mode's most-cited source is YouTube, at 5.3% of its citations. Everything Google owns, YouTube included, reaches 5.5%, against 0.51% on ChatGPT Search. Its social-platform group reaches 13.0%, versus 7.7% on ChatGPT Search.

  • Google AI Mode13.0%
  • ChatGPT Search7.7%
Share of citations from social platforms.

What we stopped counting: Google's own result pages and redirect wrappers

A search engine sometimes returns a link on its own host in place of the page it is citing. Two shapes appear in Google AI Mode answers: a link back into a Google results page, and a wrapper that redirects to the real page without naming it. Neither is a source, so neither is counted here.

Almost every google.com reference Google AI Mode returned in this window was one of the two. An earlier version of this study counted them, which made google.com the second most-cited source on Google AI Mode at 4.92% of its citations. Counted properly, google.com is 0.009% of its citations and ranks 962nd.

google.com's share of Google AI Mode citations
  • Counting them4.92%
  • Not counting them0.009%
Same prompts, same window; the only difference is whether result-page links and redirect wrappers count as citations.

Takeaway

A link into an engine's own results page is navigation, not a citation. Counting it put Google second on its own source leaderboard.

ChatGPT Search leans more toward vendor and specialist pages

ChatGPT Search sends 32.1% of citations to vendor or SaaS pages, compared with 22.3% for Google AI Mode. It also leans more toward editorial review pages and academic sources. That makes owned technical and product pages more important on ChatGPT Search than the social-heavy AI Mode source mix implies.

What kinds of sources each surface cites
Vendor/site32.0922.27
General web22.2528.56
Social7.7413.03
Editorial7.584.71
Directory3.422.31
Academic1.170.3

The top brands mostly overlap anyway

Despite the evidence split, the top brand lists are similar. Microsoft and Google take the top two places on both, and 12 of each surface's top 15 brands overlap, including Amazon, Salesforce, HubSpot, Notion, AWS, GitHub, Slack, LinkedIn, Microsoft Azure, and Google Workspace.

12 of 15
top brand names overlap across the two surfaces

Takeaway

The engines often agree on who belongs in the answer while disagreeing on why.

The gap in how much each engine cites held every week

The gap in how much each engine cited was not one unusual week. Across five full weeks, ChatGPT Search stayed between 3.4 and 4.3 references per answer, while Google AI Mode stayed between 11.5 and 17.7.

References cited per answer, by week
Jun 13.6413.93
Jun 83.3811.53
Jun 153.5412.77
Jun 224.3113.22
May 253.9617.7

The new surfaces split sources harder than the old pair

Classic ChatGPT and Google AI Overviews shared 10 of their top 25 sources in the earlier study of matched prompts. ChatGPT Search and Google AI Mode share only 7. Brand overlap moved the other way, rising from 16.4% on the older pair to 27.6% here.

  • Classic ChatGPT + AI Overviews10 shared
  • ChatGPT Search + AI Mode7 shared
Top-25 source overlap by engine pair.

The operating rule: split source work by surface

If you need Google AI Mode coverage, YouTube, social platforms, and broad web aggregation matter more than the ChatGPT Search evidence mix suggests. If you need ChatGPT Search coverage, vendor pages, specialist editorial, developer sources, and academic sources matter more.

A single AI-search checklist is too coarse. Track the sources separately from the brands, and measure each surface on the sources it actually reads.

Get the data

Dataset CSVHeadline figures behind the source, brand, and citation-count comparisons.

Sources

  1. Companion analysis: ChatGPT Search vs Google AI Mode sources
  2. Semrush: most-cited domains in AI search
  3. Profound: AI platform citation patterns

Related research

When ChatGPT and Google recommend the same top brand, do they cite the same page?
Almost never. When both engines chose and cited the same top brand, they shared a cited page for it in 309 of 8,612 matched answer pairs.
ChatGPT vs Google: same winner, different shortlist
The popular line is that AI engines disagree about who wins. They don't. Across 1,655 buyer categories ChatGPT and Google AI Overviews pick the same #1 brand 93% of the time. What they disagree about is everyone else on the list.
AI citation volatility by industry: one-shot checks miss the signal
Ask the same AI question again and the cited sources usually change. Across repeated runs, ChatGPT answers shared only about 21% of their cited sources, and every industry showed high churn.
Which domains AI cites most in its answers
A source-domain view of AI answers: which domains supply the evidence behind AI recommendations, and why community platforms are not a side channel.
Do AI-cited pages actually mention the brand?
Not always. In 80,623 of 209,116 reviewed citations, the cited page did not mention the brand attached to the citation.
Does AI make brands sound better than cited sources?
AI often does. Across 512,650 brand-citation tone pairs, positive shifts outnumbered negative shifts 207,858 to 41,615.
How often do AI citations lead to broken pages?
Rarely. Of 152,313 AI-cited pages checked at or after their latest recorded citation, 1,015 returned 404 or 410.
Does AI change its mind when comparing brands?
Sometimes. On the same prompt and criterion, one AI engine picked a different brand winner in 383 of 2,438 repeated matchups.
How often do AI-cited pages block access?
Rarely. Of 154,986 pages checked after their latest recorded citation, 2,435 returned 401, 403, or 429.
How often does AI cite a brand's own website?
Often. Of 1,060,513 page citations tied to ranked brand recommendations, 288,629 pointed to the recommended brand's own website.
Is Reddit's share of AI citations growing?
No, not in this window. Reddit's share fell from 4.9% to 3.8% on the same 15,769 prompts while YouTube rose from 3.9% to 5.2%.
Do AI engines cite their own websites?
Google's does, on most answers. Google AI Mode cited a Google-owned page on 15,100 of 18,350 matched prompts. ChatGPT Search cited one on 2,032, or 11.1%.
Do ChatGPT and Google cite the same page?
Usually not. When both engines cited the same website for the same question, they landed on at least one identical page in 19,323 of 53,032 cases.
How often does AI cite a competitor's website?
About one in twenty. Of 136,478 reviewed links between cited pages and recommended brands, 6,965 came from a different brand in the same market.
How often does AI cite PDFs?
Rarely. Of 3,954,548 citations in ChatGPT Search and Google AI Mode answers, 16,075 pointed to identifiable PDFs.
Does AI cite sources for its top brand recommendation?
Only about half. Of 215,349 top-ranked brand recommendations, 113,609 had at least one citation attached to that brand in the same AI answer.
Does AI cite the same website more than once?
In nearly six in ten answers with at least two cited pages. AI cited multiple pages from the same website in 251,446 of 423,921 such answers.
Do ChatGPT and Google recommend the same top brand?
Only about one in three times. ChatGPT Search and Google AI Mode chose the same top brand in 29,616 of 81,800 matched same-prompt answer pairs.
How old are the pages AI cites?
Much younger than page age suggests. Among 116,379 citations with a measurable server-reported modification date, the median page was modified 3 days before the answer that cited it.
What happens when ChatGPT searches the web?
The brand answer changes. Across 43,757 matched answer pairs, ChatGPT's searched answer named the same first brand as its no-search answer only 35% of the time.
The AI engine report card
Close on which brands to name, far apart on everything else. On the same 17,083 prompts, 7 of 10 report-card metrics split by 2.6 times or more between ChatGPT Search and Google AI Mode.

About this research

Dimitry Apollonsky

Founder, Parse

I built Parse to track where AI answers really come from: the sources they cite and the brands they name. DM me on LinkedIn to talk shop.

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