Do backlinks matter for AI citations?

What are the key facts about backlinks and AI citations?

Do backlinks correlate with showing up in AI answers?

Weakly, and far less than being talked about does. The biggest public study is from Ahrefs, an SEO software company. These are Ahrefs' measurements, not numbers from Google or OpenAI.

In May 2025 Ahrefs took 75,000 brands and checked how often each one was mentioned in millions of Google AI Overviews. Then it ran Spearman correlations between those mentions and the brand's SEO metrics. Ahrefs

• Branded web mentions: 0.664. How often the brand name appears across the web was the strongest signal measured.
• Branded anchors: 0.527. Links whose text is the brand name.
• Branded search volume: 0.392. How many people search the brand name.
• Domain Rating: 0.326. Ahrefs' own score for a site's link strength.
• Referring domains: 0.295.
• Number of backlinks: 0.218. Raw link count was near the bottom.

The gap is wide. Brands in the top quarter for web mentions averaged 169 AI Overview mentions. Brands in the next quarter down averaged 14. The bottom half averaged 0 to 3.

In December 2025 Ahrefs ran the same study across ChatGPT, Google AI Mode and AI Overviews. Branded web mentions scored 0.664 in ChatGPT, 0.709 in AI Mode and 0.656 in AI Overviews. A new factor, YouTube mentions, came out on top at about 0.737. On links, the author wrote that they found "very weak correlations between link metrics" and brand mentions in every engine. Ahrefs

Does any study say backlinks still matter for AI?

Yes. Semrush, another SEO software company, found that link authority still tracks with AI mentions, so this is not a story where links mean nothing.

In October 2025 Semrush studied 1,000 randomly chosen domains across ChatGPT, ChatGPT with Search, Gemini, Google AI Overviews and Perplexity. It compared each domain's Authority Score, Semrush's own blend of link quality, referring-domain variety and traffic, against how often the domain was mentioned. Semrush

• Authority Score vs AI mentions: Pearson 0.65, Spearman 0.57. That is a real relationship.
• Authority Score vs AI share of voice: Pearson about 0.23, Spearman about 0.36. Weaker, and Semrush reads the gap as a threshold: gains show up mainly after a site reaches the higher authority tiers.
• Nofollow links: Spearman 0.509, almost the same as followed links at 0.504. Semrush wrote that "Nofollow links have nearly the same impact on AI visibility as standard follow links."
• Variety over volume: links from many different sites tracked AI visibility better than sheer link count.

Semrush's headline was "Backlinks Still Matter, But Quality Trumps Quantity in AI Search." Its advice was to get mentioned and cited for content that adds value, through digital PR, expert articles and trusted industry resources, not to buy links. Semrush did not add a causation warning in that post, so we will: a strong Authority Score is also a sign of an established brand, and established brands get mentioned for many reasons.

A second Semrush study, published July 2026, looked at who "owns" a topic in ChatGPT across 50,000+ brands and 1,094 US categories tracked from January to June 2026. When two brands competed for the same topic, the winner had the higher Authority Score only 52.5% of the time, close to a coin flip. Semrush concluded that "traditional SEO metrics aren't enough to explain who owns a topic." Semrush

Do the sites AI cites most have the most links?

Not in a way that explains their citations. Ahrefs checked this directly in June and July 2025, using the 50 most-cited domains in each engine from about 76.7 million AI Overviews, 957,000 ChatGPT prompts and 953,500 Perplexity prompts.

First, Ahrefs compared each top domain's link strength (its Ahrefs Rank, based on the size and quality of its followed referring domains) with how often the engine mentioned it. The Spearman correlations were -0.12 for AI Overviews, 0.01 for ChatGPT and -0.34 for Perplexity. None was strong, and ChatGPT showed no relationship at all. Ahrefs

Then Ahrefs asked a different question: does it matter whether the pages that mention you are well linked? Here the answer varied by engine. The correlation with AI visibility was 0.70 for AI Overviews, 0.40 for Perplexity and 0.12 for ChatGPT. Ahrefs The author gave the usual correlation-is-not-causation warning, "especially here."

The sites that get cited most are the sites that already hold a lot of what people say and know. In Ahrefs' June 2025 count, Wikipedia led ChatGPT at 16.3% of citations, YouTube led Perplexity at 16.1%, and YouTube (9.5%) and Wikipedia (8.4%) led AI Overviews. Ahrefs Semrush's 13-week study from July to October 2025, covering more than 100 million citations in ChatGPT search, Google AI Mode and Perplexity, found Reddit, Wikipedia, LinkedIn and YouTube at the top, with ChatGPT's Reddit share swinging from close to 60% of responses in early August to about 10% by mid-September. Semrush

What does Google say about links and its AI answers?

Google says its AI features run on the same ranking systems as Search, links are still one of those systems, and buying links is spam. It also says chasing fake mentions is not worth it.

AI Overviews and AI Mode are built on Search. Google's guide to its generative AI features, last updated July 2026, says they are "rooted in our core Search ranking and quality systems" Google and that they use Google's core ranking systems to retrieve relevant web pages. A page has to be indexed and eligible for a snippet in regular Search to appear.

Links are still a ranking system. Google's guide to its ranking systems lists "Link analysis systems and PageRank" among them. It says these systems read how pages link to each other to judge what pages are about and which might be most helpful, and that PageRank "continues to be part of our core ranking systems." Google Google's SEO starter guide adds that "Google primarily finds pages through links from other pages it already crawled." Google

Buying links is spam. Google's spam policies define link spam as links made "primarily for the purpose of manipulating search rankings." Google The examples include exchanging money, goods or services for links, sending someone a product in exchange for a post with a link, excessive link swaps, automated link programs, low-quality directory links, and paid articles whose links pass ranking credit. Paid links are allowed only when marked rel="sponsored" or rel="nofollow".

Fake mentions don't help either. The same AI guide says Google's AI features can show what is being said about a business across blogs, videos and forums, but that seeking inauthentic 'mentions' "isn't as helpful as it might seem" Google because its ranking systems focus on quality and its spam systems block the rest. Its advice is to create content people find unique, compelling and useful.

What do OpenAI and Perplexity say about links?

Nothing. Neither company publishes a ranking factor list, and their crawler pages, the closest thing to official guidance, do not mention links at all.

Perplexity's bot page describes PerplexityBot as "designed to surface and link websites in search results on Perplexity" Perplexity and Perplexity-User as the agent that visits a page when a user asks a question. The page covers robots.txt, firewall allow-lists and IP ranges. It says nothing about how sources are ranked or whether backlinks play a part.

OpenAI's crawler page describes three bots: OAI-SearchBot, which gathers pages for ChatGPT search; GPTBot, which collects training data; and ChatGPT-User, which fetches a page when a user asks. It says sites that block OAI-SearchBot will not be shown in ChatGPT search answers. It also says nothing about links, backlinks or ranking. OpenAI

So every claim that "ChatGPT ranks by domain authority" or "Perplexity ignores backlinks" is unconfirmed. The only public evidence is the third-party correlation data above, and in that data ChatGPT showed the weakest link to link metrics of any engine.

What should a small business do instead of buying links?

This is our advice, built on what the studies measured and what Google permits. The goal is to be named on the pages AI already reads, with facts that agree everywhere.

1. Find out where you stand. Ask ChatGPT, Gemini, Perplexity and Google a few questions a customer would ask, like "best [your service] in [your city]." Note who gets named and which sites get cited. Those cited sites are your target list.
2. Get listed where AI looks. Claim and complete your Google Business Profile, your Bing Places listing, and the two or three directories your industry trusts. Use the same business name, address, phone and website on each. Skip low-quality directory links; Google names them as link spam.
3. Earn reviews on the platforms that get cited. Ask every happy customer to review you on Google and on the review site your trade uses. Reply to reviews. Reviews are mentions in the places AI reads, and they come with the words customers actually use.
4. Get real press and community mentions. Pitch a local reporter, a trade publication or an industry newsletter with something they would write about anyway: a new location, a data point, an expert quote. Ahrefs' advice after its study was "Focus on getting your brand discussed across the web." Ahrefs Do not pay for the article or demand a link; Google treats both as spam.
5. Show up on YouTube and in forums, honestly. Ahrefs measured YouTube mentions as the single strongest factor in December 2025, and Reddit and Quora sit near the top of every citation list. Answer real questions under your real name. Never plant fake mentions; Google says they are not worth it.
6. Make your own site the clearest source about you. Put your services, prices, hours, service area, people and history on pages a model can read without a login. Keep those facts identical to your directory listings and reviews profiles.
7. Publish something only you can. Your own numbers, a before-and-after, a local price guide, a question your customers ask every week. This is what earns mentions and links without asking for them, and it is the content Google says will influence your presence in AI features.
8. Keep the links you earn. If a partner, supplier or association links to you because they work with you, that is fine. Just do not trade money, goods or guaranteed reciprocal links for it.

What should be on my AI mentions checklist?

How do I know if the mentions are working?

Ask the engines the same questions every month and watch two things: whether your name appears in the answer, and which sites get cited when it does. If a competitor is named and you are not, look at where they are mentioned that you are not, and start there.

Our free AI visibility check shows where ChatGPT, Gemini, Perplexity and Google's AI answers mention you today. The Prompt Simulator runs one question across the engines and shows which sources each one cites, so you can see which directories, review sites and publications are doing the work. For how Google picks the pages behind an AI Overview, see How AI Overviews choose sources.

Sources

1. An Analysis of AI Overview Brand Visibility Factors (75K Brands Studied) — Ahrefs. Read Oct 3, 2026.
2. Top Brand Visibility Factors in ChatGPT, AI Mode, and AI Overviews (75k Brands Studied) — Ahrefs. Read Oct 3, 2026.
3. Domain-Level Link Metrics May Not Be Good Predictors of AI Search Mentions — Ahrefs. Read Oct 3, 2026.
4. Does Being Mentioned on Highly Linked Pages Influence AI Mentions? — Ahrefs. Read Oct 3, 2026.
5. The 10 Most Mentioned Domains for ChatGPT, Perplexity, and AI Overviews Across 78.6M Searches — Ahrefs. Read Oct 3, 2026.
6. Do Backlinks Still Matter in AI Search? Insights from 1,000 Domains [Study] — Semrush. Read Oct 3, 2026.
7. AI visibility is a topic-level game: A study of 50,000 brands in ChatGPT [Study] — Semrush. Read Oct 3, 2026.
8. The Most-Cited Domains in AI: A 3-Month Study — Semrush. Read Oct 3, 2026.
9. Google's Guide to Optimizing for Generative AI Features on Google Search — Google Search Central. Read Oct 3, 2026.
10. A guide to Google Search ranking systems — Google Search Central. Read Oct 3, 2026.
11. Search Engine Optimization (SEO) Starter Guide — Google Search Central. Read Oct 3, 2026.
12. Spam policies for Google web search — Google Search Central. Read Oct 3, 2026.
13. Perplexity Crawlers — Perplexity. Read Oct 3, 2026.
14. Overview of OpenAI Crawlers — OpenAI. Read Oct 3, 2026.