Short answer: These engines barely agree on anything. One 2026 analysis of around 680 million citations found that only 11% of domains cited by ChatGPT were also cited by Perplexity. Treating AI visibility as one channel is the mistake. Each engine rewards a different kind of presence.
Key Takeaways
- Only about 11% of domains cited by ChatGPT are also cited by Perplexity.
- In one dataset, just 29 of 31,128 citations were shared by all three engines, around 0.09%.
- Perplexity cites far more sources per answer than ChatGPT, roughly four times as many.
- Perplexity rarely cites a business's own website, preferring third-party comparisons and community discussion.
- Winning on one engine tells you almost nothing about the others, so measure them separately.
How Little They Overlap
The intuition most people have is that AI assistants broadly surface the same well-known sources. The data says otherwise. Across a very large sample of citations, the overlap between ChatGPT and Perplexity domains sat at around 11%, and the proportion of individual pages cited by all three engines was a fraction of one percent.
This has a direct consequence. An agency reporting that you are "visible in AI search" without naming the engine is reporting almost nothing. Visibility is per engine, and so is the work.
What Each Engine Leans On
The patterns are consistent enough to plan around, provided you treat them as tendencies rather than rules.
| Engine | Leans on | What that rewards |
|---|---|---|
| ChatGPT | Wikipedia heavily, plus established publishers and retail sources. Browsing draws on the Bing index. | Being indexed in Bing, and being described on established reference and news sites. |
| Perplexity | Reddit, Q&A sites, LinkedIn, reference works and research databases. Crawls continuously and cites many sources per answer. | Third-party discussion and comparison content. Your own site is unlikely to be the source. |
| Gemini | YouTube and Google properties, plus substantive published articles it can quote from. | Having written something detailed enough to quote, and video where it fits. |
The Perplexity row is the one most businesses find uncomfortable. It frequently does not cite a company's own website when answering questions about that category, drawing instead on roundups, comparison articles, and community threads. No amount of on-site optimisation changes that directly.
What This Means in Practice
Three things follow, and they are not the usual advice.
First, Bing indexing is not optional. ChatGPT browsing reads the Bing index rather than Google's. A page Bing has not indexed is generally not available for ChatGPT to cite, regardless of its Google ranking. Most businesses have never opened Bing Webmaster Tools. We cover this in getting crawled and cited by AI search.
Second, your own site has a ceiling. On-site work makes you reachable, consistent, and quotable, which is necessary. But the engines that lean on third-party sources will keep citing third parties. Being present in the comparison articles, directories, and discussions of your category is a separate programme of work, and it is slower.
Third, write things worth quoting. The engines that quote published articles reward substance, not keyword coverage. A page with a specific, defensible claim and real detail is quotable. A page assembled to cover a topic is not.
A Worked Example: What We Do Here
On the technical side we have removed every reason an engine could fail to retrieve this site. Pages are prerendered to real HTML, so nothing depends on JavaScript running. Every page is also served as plain markdown to clients that ask for it, which removes the parsing step entirely. New URLs are submitted to Bing through IndexNow on publication rather than waiting to be discovered, which matters specifically because of the ChatGPT and Bing relationship.
What we will not claim is that this makes us appear in any given answer. It makes us retrievable and consistent, which is the part under our control. The third-party half is slower, less controllable, and more honest to describe as ongoing than as delivered.
That split is worth insisting on when anyone sells you AI visibility. Ask which half they are doing. The technical half can be shipped in weeks. The other half cannot be bought credibly.
How to Act on This
- Measure each engine separately. A blended "AI visibility" score hides the only useful information. The method is in how to measure share of model.
- Verify Bing has indexed your important pages. This is the fastest available fix and it is usually neglected.
- Find the third-party pages already being cited for your category, and work out how to be legitimately present in them.
- Check what the engines currently say about you for accuracy. Confident errors spread between engines.
- Re-measure monthly. These systems change, and a tactic that worked last quarter may not survive this one.
Our GEO service covers both halves, and the baseline audit is free. For the on-page structure that makes content quotable in the first place, see our AEO service. Build work starts from $500 for a website and $1,500 for a web application on our pricing overview, with final cost depending on scope.
Frequently Asked Questions
Frequently Asked Questions
If I optimise for one AI engine, do the others follow?
Mostly no. Research found only around 11% domain overlap between what ChatGPT and Perplexity cite, so strong presence on one is weak evidence about another. The technical foundations of being crawlable and consistent do help everywhere, but the sources each engine prefers differ enough that you should measure and work on them separately.
Why does Perplexity cite Reddit and forums so often?
It leans heavily on community discussion and third-party commentary rather than company-owned pages, and it cites many more sources per answer than other engines. For businesses this means your own website is unlikely to be the source it quotes, and presence in genuine community and comparison content matters more than another landing page.
Does Bing indexing really affect ChatGPT citations?
Yes, for answers where ChatGPT browses the live web, since it draws those results largely from the Bing index rather than Google. A page Bing has not indexed generally cannot be retrieved and cited, whatever its Google ranking. Checking Bing Webmaster Tools coverage is one of the quickest wins available.
How often do these citation patterns change?
Often enough that any specific breakdown should be treated as a snapshot rather than a constant. The engines change retrieval sources, index partners and ranking behaviour regularly. The durable advice is structural: stay retrievable, keep your facts consistent, and build third-party presence, then re-measure rather than assuming.
Is it worth creating YouTube content for AI visibility?
It can be, given how heavily Gemini draws on YouTube, but only if video suits what you are explaining and you will keep it up. A thin video made solely for citation purposes is unlikely to be quoted. Treat it as a channel decision first and an AI visibility benefit second.