What Google AI Overviews Cite vs ChatGPT and Perplexity

1What did we run, and what came back?

Answer Radar asked the 21 approved buying questions on our own project of all five engines, geography United States, language English, one sample per question, with no steering. 105 samples were requested; 99 returned before the run stalled with 6 outstanding, and the numbers below are over those 99. The run id is de56db16 and the full per-question detail is in our dataset file.

Grounded means the engine searched and the answer carried enough to read a verdict from. Ungrounded means it answered from memory. Thin means it searched but named no product or attached nothing to verify. Absent means Google showed no AI Overview on a results page it parsed cleanly. Those grades are the reason every number in this post has a denominator beside it.

2What did Google do instead of citing?

It showed a normal results page. For 16 of our questions Answer Radar loaded a rendered desktop Google results page, found no AI Overview, and recorded the sample with status empty and reason not shown. Two searches failed at the provider and are counted on neither side. The appearance rate for this run is zero over sixteen.

Source: Linkeddit Answer Radar, run de56db16 and the two smoke checks of 6 September 2026; aggregate in the Google AI Overviews tracker.

This is not a parser failure and not a geography block. Google's Search Central documentation says Overviews appear only when its systems decide one is additive and that they often do not trigger. The shape of our questions, long vendor comparisons in a niche B2B category, is the shape that often does not. The same day, the generic query "best CRM for small business" triggered an Overview twice on single checks, with 12 and then 8 sources.

3What did ChatGPT and Perplexity cite for the same questions?

Everything Google declined to answer, the assistants answered. Perplexity attached exactly ten citations to every one of its 19 answers, across sixty-seven distinct domain votes; ChatGPT searched on 12 of 20 and attached 3.35 per answer across every measured answer. The domains they leaned on for our unbranded category questions were not the same.

Two patterns. First, ChatGPT answered the AI visibility and AEO questions from memory in five of six cases, so for those questions its recommendations (Semrush, Ahrefs, BrightEdge, Clearscope) reflect what it learned in training, not a page it read. Second, Perplexity cited reddit.com in two of these answers and Gemini in three, ChatGPT in two, Claude in none, the same ordering as our longer-run measurement, where 3 of 144 customer-project Perplexity citations were a Reddit page against 1 of 83 for ChatGPT.

A poster in r/SEO ran the same kind of check on their own category and reported the version of this most vendors feel:

Our own domain was cited in 4 of ChatGPT's 45 domain votes and 3 of Perplexity's 67, almost entirely on questions that named us. The per-question detail, including where we were absent and what was cited instead, is in how we track our own AI visibility.

4What does an AI Overview cite when it does appear?

Our two observed Overviews are two observations, so the honest source for this section is other people's larger samples, read with their denominators. SE Ranking analysed 100,000 US keywords across 20 niches after Google moved AI Overviews onto a newer model and posted the results in r/GeminiAI: Overview appearance fell from 60.85% to 55.21% of keywords, source-less Overviews rose from 0.11% to 10.63%, and the most cited domains were youtube.com at 9.40% of citations, reddit.com at 4.39%, then facebook.com, quora.com and indeed.com. That is a vendor's sample over general keywords, and it says so.

On overlap with organic results, Search Engine Journal reported analysis putting 54% of AI Overview citations inside the top twenty organic results, up from about a third at launch. Ahrefs, in the comparison we covered in AI Overviews versus AI Mode, found 11% of Overviews carried no citation at all.

When an Overview does appear for one of your questions, Answer Radar resolves each Google redirect link to its publisher and records whether the Overview named or recommended you, so the comparison in the title can be made row by row. For our category, on this day, the row was empty on the Google side.

5Why is the overlap between engines so small?

Because each engine reads a different slice of the web and decides differently whether to read at all. Google's surface starts from its own index and ranking and adds a trigger decision on top. ChatGPT starts from memory and searches only when it judges the question needs it. Perplexity searches every time through its own layer. Gemini grounds nearly every answer and cites barely more than half. Claude searches most of the time and attaches few sources. Four different instruments, plus one that sometimes does not switch on.

A practitioner in r/GEO_optimization who watched a new site sit at zero citations across six engines for three weeks drew the conclusion that applies here too:

For Google there is a third barrier before either of those: the surface has to appear. That is why Answer Radar reports an appearance rate in every Google AI Overviews segment and never pools it with the assistants. Pooling would turn sixteen absent Overviews into sixteen misses and send a team to fix pages Google never summarised.

6How do you measure this for your own category?

• 1. Ask the same questions of every engine on the same day. A comparison across days compares Google on Tuesday with ChatGPT on Thursday. Ours ran within seven minutes.
• 2. Read appearance before presence on Google. If the Overview appeared on 2 of 20 questions, the presence rate is over two answers, and the eighteen tell you Google is not the surface deciding those buys today.
• 3. Separate memory answers from searched ones on ChatGPT and Claude. A memory answer that names a competitor is a fact about training data, not about a page. Eight of ChatGPT's twenty answers in our run were memory answers.
• 4. Resolve Google's redirect links. When an Overview does appear, its sources are often opaque google.com links until followed. Without resolving them the comparison in this post's title is a list of google.com against a list of publishers.
• 5. Keep the question set frozen and re-run. Google confirmed in late August 2026 that some Overviews now expand into a fuller AI Mode style answer by default, which will change what appears and what is cited. A frozen set is the only way to see it.

The help guides on tracking Google AI Overviews and reading the appearance rate walk through the rows. The ranking side, for when an Overview does appear on your questions, is in how to show up in Google AI Overviews.

Frequently asked questions