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Research · Published 2026-05-27 · 4 LLMs · 48 datapoints · 14 named sources

The Discovery Gap,why your brand looks visible but isn't.

FORKOFF Research: we measured ourselves first as a self-test of the methodology, then ran the same audit across client brands. A brand cites at 100% on its own branded queries (what is FORKOFF, is FORKOFF legit) and near 0% on category head terms (best AI marketing agency, top AI marketing agency 2026) across ChatGPT, Claude, Gemini, and Perplexity. The pattern repeats on every brand we audit. This report surrounds that first-party finding with 40-plus cited data points from 14 named sources on what the gap costs, who wins the category instead, and the levers that close it. The fix is not more branded content.

100% branded citation rate · ~0% head term citation rateMeasured via FORKOFF AI Search Visibility CheckerChatGPT, Claude, Gemini, Perplexity · FORKOFF citation-tracking pipeline
100%Branded query citation rate
~0%Head term citation rate
4 LLMsChatGPT, Claude, Gemini, Perplexity
14Named sources cited
TLDR · the finding

High on branded queries. Near zero on category head terms.

One sentence: most brands cite near 100% across 4 LLMs on their own branded queries and near 0% across the same 4 LLMs on category head terms. We validated the methodology on our own self-test scan first, then repeated it across client audits. The gap is the part of AI search visibility that the branded layer hides.

A brand that cites at 100% on its own name feels visible. It is visible at the second ask, after the prospect already knows the brand exists. It is invisible at the first ask, where the prospect's AI-mediated category question gets answered with aggregators, review platforms, and the brand's competitors. The 100% number measures retention. The 0% number measures discovery.

Definition

What the Discovery Gap is.

Two query types, one brand, one gap.

The Discovery Gap is the delta between a brand's branded query citation rate and its head term citation rate. Branded queries name the brand (what is FORKOFF, is FORKOFF legit, FORKOFF reviews). Head terms name the category the prospect is shopping (best AI marketing agency, AI marketing agencies for startups). Both query types matter. Branded queries close the loop after the prospect already heard the name. Head terms decide whether the prospect ever hears the name at all.

Most brands measure the first and ignore the second. The branded number sits high because the LLM trained on the brand's own website. The head term number sits low because the LLM defaults to citing aggregator listicles and competitor pages on category queries. The gap exposes the brand's structural position in the AI-mediated category, not the brand's content quality.

Editor's choice · ranked top 20

The 20 stats that define the Discovery Gap in 2026.

Ranked by proprietary weight (first-party data that no aggregator holds ranks first), then by how directly the number explains the gap, source authority, and topical centrality. Every row is a number, a named source, and a category, built to be lifted whole by an answer engine.

#Data pointSourceCategory
01100% vs ~0%Brands cite at 100% on their own branded queries and near 0% on category head terms, across all 4 enginesFORKOFFBranded vs head-term
024 of 4Engines showing the identical 100-versus-near-0 gap shape (ChatGPT, Claude, Gemini, Perplexity)FORKOFFBranded vs head-term
0314 of 50Buyer-intent prompts that returned zero citations on any engine, clustered on head-term and tooling queriesFORKOFFBranded vs head-term
0448Datapoints per Discovery Gap audit: 12 paired branded-versus-head-term sets across 4 enginesFORKOFFBranded vs head-term
05+120%A page cited inside a Google AI Overview earns 120% more organic clicks per impression than an uncited page on the same SERPSeer InteractiveCost of being uncited
0661.7%Share of AI citations that are ghost citations: the engine uses a page as a source without naming the brandSemrushWho gets cited
0740.1%Reddit is the single most-referenced domain across AI answers, at 40.1% of all LLM referencesSemrushWho gets cited
080.664Brand web mentions correlate 0.664 with AI visibility, the head-term lever that actually moves the numberAhrefsLevers that close it
09~0.218Backlinks correlate only about 0.218 with AI visibility: mentions beat links by roughly three to oneAhrefsLevers that close it
10115%Citing authoritative sources lifts AI visibility 115% for lower-ranked pages (peer-reviewed)PrincetonLevers that close it
1110xBrands in the top web-mention quartile earn 10 times more AI Overview mentions than the next quartileAhrefsLevers that close it
1238%Only 38% of AI Overview citations now come from a Google top-10 page, down from 76%AhrefsWhy head terms are hard
1311%Domain overlap between the sources ChatGPT and Perplexity cite: each engine builds a disjoint category answerAuthorityTechWhy head terms are hard
1446xCross-web spread in brand citation rate between engines: 0.59% on ChatGPT versus 13.05% on PerplexityAuthorityTechWhy head terms are hard
158% vs 15%Users click a traditional result only 8% of the time with an AI summary present, versus 15% withoutPew Research CenterCost of being uncited
1647.9%Wikipedia is 47.9% of ChatGPT's top-10 sources: extreme single-source concentration on the categoryProfoundWho gets cited
1746.7%Reddit is 46.7% of Perplexity's top-10 leading sources, the aggregator layer dominating one engine's answersProfoundWho gets cited
1828.9%The top-50 brands take 28.9% of all AI Overview citations: the category answer is incumbent-concentratedAhrefsWhy head terms are hard
1980.41%Share of ChatGPT cited URLs ending in .com: the category answer skews commercial third-party, not owned blogsProfoundWho gets cited
20up to 40%Maximum visibility boost in generative-engine responses from GEO methods overall (peer-reviewed)PrincetonLevers that close it

Rows marked FORKOFF are first-party numbers from the FORKOFF AI Search Visibility Checker and the GEO Citation Lab. Every other row links to its named primary source. The deep dives below carry the rest of the verified pool, and the full source list is at the foot of the page.

Methodology · how it was measured

48 datapoints, 4 LLMs, 1 brand pair, plus a traced aggregation.

How the FORKOFF AI Search Visibility Checker (ASVC) runs the gap audit, and how every surrounding statistic was sourced.

ASVC queries 4 LLM engines (ChatGPT, Claude, Gemini, Perplexity) through the FORKOFF citation-tracking pipeline. For each brand under test, the tool runs 12 paired query sets. Each pair has a branded variant and a head term variant, both scoped to the same brand position. The 12 pairs cover the canonical question shapes a prospect asks (what is, is X legit, X reviews, best X, top X 2026, X for startups, X vs Y, alternatives to X, recommended X).

Each pair runs across all 4 engines. That produces 48 datapoints per brand audit. Citation is logged when the brand domain or named entity is present in the LLM response. The tool returns a per-engine citation rate for branded queries, a per-engine citation rate for head terms, and the gap score.

First-party sample
12 paired branded-versus-head-term query sets run against 4 engines, for 48 datapoints per brand audit, validated on a FORKOFF self-test scan then repeated across client audits.
Engines
ChatGPT, Claude, Gemini, and Perplexity, queried through the FORKOFF citation-tracking pipeline. A citation is logged when the domain or named entity appears in the response.
Instrument and window
The FORKOFF AI Search Visibility Checker, 2026-05 window. The paired-query design is what isolates discovery from retention.
Aggregation
The surrounding statistics come from 14 named authorities. Each was traced to a primary named source with a report title and year; a figure with no traceable primary was excluded.

The exclusion discipline is the part most aggregations skip. Several widely-quoted numbers were deliberately left off this page because they could not be traced to a single named primary study with a matching denominator. A commonly-repeated split of owned-versus-earned citation share appeared only in a search snippet with no numeric breakdown in the underlying source, so it was dropped rather than laundered. A number that cannot be sourced is left off the page, not reworded onto it. First-party figures are directional estimates from a specific measurement window; individual outcomes vary by category, prompt set, and engine.

The 4-LLM split

Branded vs head term citation rate per engine.

The gap shape is consistent across engines. Every brand we audit shows the same pattern at varying scales: high citation on its own name, near zero on category head terms across all 4 LLMs.

← scroll horizontally to see more →

FeatureLLM engineTested via the FORKOFF AI Search Visibility CheckerBranded query citationFORKOFF cited on its own brandHead term citationFORKOFF cited on category head term
ChatGPT (GPT-4o)100%0%
Claude (Sonnet 4.5)100%0%
Gemini (2.0 Pro)100%0%
Perplexity (sonar-pro)100%0%
Chart 1 of 4

The gap: retention is not discovery

BRANDED QUERYHEAD TERM100%~0%

An audited brand cites near 100 percent on its own name and near 0 percent on its category head term, across all four engines measured. The branded number measures retention (the engine trained on the brand site). The head-term number measures discovery (the engine answers the category with aggregators, review platforms, and competitors). Writing another About page moves 100 to 100 for zero discovery lift.

Source: FORKOFF The Discovery Gap 2026. 12 paired query sets across 4 engines, 48 datapoints.

In depth · the cost of being uncited

Being uncited on the category is the most expensive place to sit.

The gap is not a vanity metric. The discovery layer is where the clicks are, and an uncited page on a category head term loses most of them.

Seer Interactive measured the click economics across 53 brands, 5.47 million queries, and 2.43 billion impressions and found a page cited inside a Google AI Overview earns 120 percent more organic clicks per impression than an uncited page on the same result. Per one million informational impressions, a query with no AI Overview drove 33,500 clicks, a page cited inside the AI Overview drove 20,743, and a page present on the result but not cited drove only 9,445. The gap between cited and uncited is roughly 2.2 times the click volume, and that gap opens on exactly the category head terms where the Discovery Gap lives.

There is a second cost that even cited pages pay. Seer found that a cited page still earns 38 percent fewer clicks than the same query would have driven with no AI Overview present at all, because the answer absorbs the click. Pew Research, studying real browsing behavior, found users click a traditional result only 8 percent of the time when an AI summary appears, versus 15 percent without, and click a link inside the summary just 1 percent of the time. The click is collapsing into the answer, which is why being named inside the answer, rather than merely present on the page, is the thing worth paying for.

The strategic reading is that discovery and retention are priced differently. Retention queries reach a prospect who already knows the brand and would find it anyway. Discovery queries are where a stranger meets the category, and where the cited-versus-uncited click gap is widest. A brand invisible on the head term is not losing a rounding error; it is losing the more valuable half of the traffic on the surface that is still growing.

Chart 2 of 4

The cost of not being cited on the category

No AI Overview present33,500
Cited inside the AI Overview20,743
Present on the SERP but not cited9,445

Organic clicks per one million informational impressions, split by AI Overview state. A page cited inside the answer earns roughly 2.2 times the clicks of a page that is present on the same result but not cited. Being uncited on a category head term is the most expensive place to be, and it is exactly where the Discovery Gap lives.

Source: Seer Interactive, AIO Impact on Google CTR 2026 Update. 53 brands, 5.47M queries, 2.43B impressions.

In depth · who wins the category answer

The category answer runs on Reddit, Wikipedia, and YouTube, not brand blogs.

If the branded number is high because the engine read the brand's own site, the head-term number is low because the engine reads someone else's. The pattern is consistent across every large study.

Semrush's study of 150,000 AI citations found Reddit is the single most-referenced domain at 40.1 percent of all LLM references, ahead of Wikipedia at 26.3 percent and YouTube at 23.5 percent. The same finding was reported independently by Search Engine Land. Engines lean on user-generated content and encyclopedias because they capture first-hand discussion and dense natural-language phrasing, and because a polished brand blog reads as marketing and gets discounted. This is the mechanical reason a brand's own domain is rarely the cited source on a category head term.

Inside a single engine the concentration is sharper still. Profound's analysis of 680 million citations found Wikipedia is 47.9 percent of ChatGPT's top-10 sources while Reddit is 46.7 percent of Perplexity's top-10, so the two leading engines lean on almost opposite anchors. Profound also found 80.41 percent of ChatGPT's cited URLs end in .com, so commercial third parties are cited heavily, just not the brand under test; the slots go to aggregators, review platforms, and competitors on the category question.

Semrush's Ghost Citations study, across 3,981 domain appearances, 115 prompts, 14 countries, and 4 engines, adds the sharpest version of the problem: 61.7 percent of AI citations are ghost citations, where the engine uses a page as a source without naming any brand at all, and only 13.2 percent of appearances included both a citation link and a brand mention. Gemini names a brand 83.7 percent of the time but cites a source only 21.4 percent, while ChatGPT cites a source 87 percent of the time but names the brand only 20.7 percent. The engine can lean on your content and still leave your name out of the answer.

The over-reading to avoid is that a brand should spam Reddit. The signal an engine rewards is a genuine, upvoted, answer-shaped discussion a retrieval system can lift as a self-contained response, which is the opposite of a promotional thread. The lesson is not to abandon owned content but to earn presence inside the sources the engine already consults for the category, which is what the levers section below is about.

Chart 3 of 4

Who wins the category answer instead of the brand

Share of all LLM references (Semrush)
Reddit40.1%
Wikipedia26.3%
YouTube23.5%
Per-engine concentration (Profound)
Wikipedia in ChatGPT top-1047.9%
Reddit in Perplexity top-1046.7%
ChatGPT cited URLs ending .com80.41%

On category head terms the engine assembles its answer from user-generated content, encyclopedias, and third-party commercial pages, not the brand's own blog. Reddit alone is 40.1 percent of all LLM references. Inside a single engine the concentration is even sharper: Wikipedia is nearly half of ChatGPT's top-10 sources and Reddit nearly half of Perplexity's. Shares are read as a share of references, not a slice of one pie.

Sources: Semrush AI Search Visibility Study 2025 (150,000 citations); Profound AI Platform Citation Patterns 2025 (680M citations).

In depth · why the head term is hard to earn

The category slots are few, disjoint, and incumbent-concentrated.

Even a brand that decides to fix the gap faces a structural wall: the citation slots on a head term are scarce, the engines barely agree on who fills them, and the incumbents already hold a large share.

Ranking first no longer earns the citation. Ahrefs found only 38 percent of AI Overview citations now come from a Google top-10 page, down from 76 percent, and its AI Search Overlap study found only 12 percent of AI-cited URLs rank in Google's top 10 for the original prompt. AI citation has decoupled from classic ranking, so the SEO work that earned the blue-link position does not automatically earn the answer-box slot.

The engines also disagree with each other. AuthorityTech's audit of 21,143 citations found only 11 percent of cited domains overlap between ChatGPT and Perplexity, and a 46-times spread in brand cite rate between engines (0.59 percent on ChatGPT versus 13.05 percent on Perplexity). Winning one engine does not win another, so the head-term fix has to be run and measured per surface. The source pools compound the difficulty: per FORKOFF first-party reads, Perplexity cites 8 to 12 distinct domains per answer while Gemini's median is 3, the narrowest pool of the four and the hardest to break into.

Finally the field is incumbent-concentrated. Ahrefs found the top-50 brands take 28.9 percent of all AI Overview citations, a moat for the largest players. The other 71 percent is spread across a long tail that a focused, well-sourced page can enter without out-ranking a giant, which is the opening a challenger plays for. The discipline is to pick the two or three engines that matter for a category, measure each on its own scorecard, and win the specific slots that engine gives.

11%

ChatGPT and Perplexity cited-domain overlap

AuthorityTech

38%

AIO citations from a Google top-10 page, down from 76%

Ahrefs

28.9%

Top-50 brands' share of all AIO citations

Ahrefs

Strategic insight

Why the fix is not more branded content.

The branded layer is already at 100%. The lever has to land on the surfaces the LLMs cite on head terms.

Branded content lift

Branded queries cite at 100%. Writing another About FORKOFF page or another founder story moves the branded number from 100% to 100%. Zero lift on the discovery side. The LLM was already trained on every page on the brand's own domain.

Third-party citation lift

Head term queries cite aggregator listicles, G2, CB Insights, Reddit, and industry press. Each inclusion on those surfaces compounds across LLM training data refreshes. A single listicle inclusion in Q2 keeps citing through the Q4 cut.

The 3-lever fix

Where to put the next dollar of effort.

Three levers, ranked by category authority compound. Each one moves the head term number, not the branded number, and the published research points at the same lever set from two directions.

01

Aggregator listicle inclusion

The pages LLMs cite on best AI marketing agency are aggregator listicles from Omniscient Digital, NinjaPromo, OutreachZ, M1-Project, and a long tail of niche review sites. Inclusion on these pages is the single highest-leverage lever because the same pages are cited across all 4 LLMs.

02

Entity graph integrity

CB Insights, Wikidata, G2, and Crunchbase carry canonical entity records that LLMs use as ground truth on category questions. A complete entity record with funding, founders, and category tags lifts citation probability on the head term layer because LLMs prefer structured, verifiable sources.

03

Reddit + industry press density

Long-tail Reddit threads, podcast transcripts, and industry press articles aggregate into category authority. LLMs cite these on niche head term variants (best AI marketing agency for Web3, AI marketing agencies for B2B SaaS). Density across the long tail compounds against the aggregator layer.

The evidence for this lever set is unusually strong because a correlation study and a controlled experiment converge. Ahrefs studied 75,000 brands and found brand web mentions correlate 0.664 with AI visibility while backlinks correlate only about 0.218, and Domain Rating, the classic authority metric, correlates a weak 0.326. Ahrefs separately found brands in the top mention quartile earn 10 times more AI Overview mentions than the next quartile. For discovery, being mentioned across the web out-predicts being linked to, by roughly three to one.

Princeton's peer-reviewed GEO study (KDD 2024) ran controlled experiments and ranked the on-page levers by measured impact: citing authoritative sources lifts generative-engine visibility 115 percent for lower-ranked pages, adding statistics lifts it 41 percent, and expert quotations lift it 28 percent, with GEO methods together lifting visibility up to 40 percent. A correlation is not a guarantee, but when a 75,000-brand field study and a controlled experiment point at the same lever, the recommendation is safe to act on. The weak backlink correlation is the useful negative result: links are not the first place to spend for the head-term number.

Chart 4 of 4

What closes the gap: mentions and structure beat links

Visibility lift (Princeton GEO)
Cite authoritative sources (lower-ranked pages)+115%
Add statistics to the page+41%
Add expert quotations+28%
GEO methods overall (upper bound)up to +40%
Correlation with AI visibility (Ahrefs r)
Brand web mentions0.664
Domain Rating0.326
Backlinks0.218

A peer-reviewed experiment and a 75,000-brand correlation study agree on the head-term lever set. Citing authoritative sources and structuring content around statistics produce the largest generative-engine visibility lifts, and off-site brand mentions out-predict backlinks by roughly three to one for AI visibility. None of these move the branded number, which already sits near 100 percent. They move the head-term number, which is the whole point.

Sources: Princeton GEO, KDD 2024 (visibility lift); Ahrefs Top Brand Visibility Factors, 75,000 brands 2025 (correlation r).

Part of the AI Citation Index

This is the discovery spoke of a larger index.

The Discovery Gap is one finding inside FORKOFF's broader first-party benchmark of how AI engines choose what to cite.

This report goes deep on one sub-topic: the branded-versus-head-term gap and the cost, source-mix, and levers around it. The broad picture, a 34 percent average cite rate across five engines, the per-engine index, the most-cited-domain time series, and the full 20-source aggregation, lives in the FORKOFF AI Citation Index 2026, which this page is the companion Discovery Gap dataset for. Read the index for the whole benchmark; read this page for the one finding that reframes how a brand should read its own AI-visibility number.

Run the audit

Run the Discovery Gap audit on your own brand.

Open the FORKOFF AI Search Visibility Checker. Enter your brand domain. Get a per-engine citation rate, a gap score, and a 3-lever action plan in seconds. Free, no email gate for the public read. Pair this report with the cold email benchmarks if you want the matching outbound layer. The FORKOFF Research team ships a new report each month.

Frequently asked questions

What is the Discovery Gap?

The Discovery Gap is the delta between a brand's branded query citation rate (queries that name the brand, such as 'is FORKOFF legit') and its head term citation rate (category queries the prospect actually asks first, such as 'best AI marketing agency'). Most brands cite at 80% to 100% on their own branded queries because the LLM was trained on the brand's own website and About page. The same brands cite at near 0% on the category head terms because the LLM defaults to citing aggregator listicles, review platforms, and competitor pages. Across the FORKOFF measurement the gap held at 4 of 4 engines. The gap is the structural weakness most brands never measure.

How did FORKOFF measure the Discovery Gap?

Through the FORKOFF AI Search Visibility Checker (ASVC) at forkoff.xyz/tools/aeo-checker. The tool queries 4 LLM engines (ChatGPT, Claude, Gemini, Perplexity) through the FORKOFF citation-tracking pipeline. For each brand under test, ASVC runs 12 paired query sets covering branded variants ('what is FORKOFF', 'is FORKOFF legit', 'FORKOFF reviews') and category head term variants ('best AI marketing agency', 'top AI marketing agency 2026', 'AI marketing agencies for startups'). Each pair runs across all 4 engines, producing 48 datapoints per brand audit. Citation is logged when the brand domain or named entity is present in the LLM response.

Why is the fix not more branded content?

Because the branded layer already works. FORKOFF cites near 100% on its own branded queries across all 4 engines. Writing another 'About' page moves the branded number from 100% to 100% for zero discovery lift. The head term number sits low because the LLMs answer category queries with aggregators, not the brand's own site. Semrush found Reddit alone is 40.1% of all LLM references, and 61.7% of AI citations are ghost citations where the engine uses a page as a source without naming a brand at all. The fix has to be third-party citation density on the surfaces the LLMs are already citing, not deeper first-party content the LLMs already crawled.

How expensive is it to be uncited on a category head term?

Measurably expensive. Seer Interactive, across 53 brands, 5.47 million queries, and 2.43 billion impressions, found a page cited inside a Google AI Overview earns 120% more organic clicks per impression than an uncited page on the same result. Per one million informational impressions, a query with no AI Overview drove 33,500 clicks, a page cited inside the AI Overview drove 20,743, and a page present but not cited drove only 9,445. Pew Research separately found users click a traditional result only 8% of the time when an AI summary appears versus 15% without, and click a link inside the summary just 1% of the time. Being uncited on the category is the most expensive place to sit.

Who gets cited on category head terms instead of the brand?

Aggregators, user-generated content, and third-party commercial pages. Semrush's 150,000-citation study found Reddit is the single most-referenced domain at 40.1% of all LLM references, ahead of Wikipedia at 26.3% and YouTube at 23.5%. Inside a single engine the concentration is sharper: Profound's 680-million-citation study found Wikipedia is 47.9% of ChatGPT's top-10 sources and Reddit is 46.7% of Perplexity's top-10, and 80.41% of ChatGPT cited URLs end in .com. The brand's own domain is rarely the cited source on a head term, which is exactly why owned content does not move the number.

Why is head-term citation structurally hard to earn?

Because the slots are few, disjoint, and incumbent-concentrated. Ahrefs found only 38% of AI Overview citations now come from a Google top-10 page, down from 76%, so ranking first no longer earns the citation. AuthorityTech found only 11% of cited domains overlap between ChatGPT and Perplexity, so winning one engine does not win another, and a 46-times spread in brand cite rate between engines (0.59% ChatGPT versus 13.05% Perplexity). Ahrefs also found the top-50 brands hold 28.9% of all AI Overview citations. The category answer is a concentrated, per-engine game of a few slots that a brand has to earn on each surface separately.

What are the 3 levers that close the Discovery Gap?

Aggregator listicle inclusion, entity graph integrity, and Reddit plus industry-press citation density. The research points at the same lever set from two directions. Ahrefs' 75,000-brand study found brand web mentions correlate 0.664 with AI visibility while backlinks correlate only about 0.218, and top-mention-quartile brands earn 10 times more AI Overview mentions. Princeton's peer-reviewed GEO study (KDD 2024) found citing authoritative sources lifts visibility 115% for lower-ranked pages, adding statistics 41%, and expert quotations 28%, with GEO methods together lifting visibility up to 40%. Every one of these moves the head-term number, not the branded number.

How do I run the Discovery Gap audit on my own brand?

Open the FORKOFF AI Search Visibility Checker, enter your brand domain, and the tool runs the same 4-engine query loop against your brand. Output is a per-engine citation rate table for branded queries and head term queries, plus a gap score and a 3-lever action plan ranked by impact. The tool is free, no email required for the public read of the report. The same methodology that produced this research piece is what the tool runs on every brand audit.

Citation

Cite this research.

Stable for journalist, academic, and LLM citation. APA and BibTeX below.

APA-style citation

FORKOFF Research. (2026). The Discovery Gap: Why Your Brand Looks Visible in AI Search But Isn’t. FORKOFF. https://forkoff.xyz/research/asvc-discovery-gap-2026

Published 2026-05-27Last updated 2026-07-03Source: FORKOFF ASVC
BibTeX citation
@misc{forkoff_discovery_gap_2026,
  author = {FORKOFF Research},
  title  = {The Discovery Gap: AI Search Visibility 2026},
  year   = {2026},
  url    = {https://forkoff.xyz/research/asvc-discovery-gap-2026},
  note   = {4 LLMs, 48 datapoints, 14 named sources, FORKOFF ASVC methodology}
}
Sources consulted · 14 named authorities

Every stat traces to a named source.

First-party FORKOFF data leads; the aggregation draws on the strongest published research on AI citations. Each source below is named with its study and year, and linked.

SourceStudy and sampleYear
FORKOFF ResearchThe Discovery Gap, 12 paired sets x 4 engines = 48 datapoints2026
FORKOFF ResearchGEO Citation Lab Rerun, 50 prompts x 5 surfaces = 250 measurements2026
Seer InteractiveAIO Impact on Google CTR 2026 Update, 53 brands / 5.47M queries / 2.43B impressions2026
SemrushThe Ghost Citations Study, 3,981 appearances / 115 prompts / 14 countries / 4 engines2026
SemrushAI Search Visibility Study, 150,000 citations / 5,000 keywords2025
ProfoundAI Platform Citation Patterns, 680M citations2025
AhrefsTop Brand Visibility Factors, 75,000 brands studied2025
Ahrefs38% of AI Overview Citations Pull From The Top 10, 863K SERPs / 4M AIO URLs2026
AhrefsAI Search Overlap Study, AI-cited URL vs top-10 rank2025
Ahrefs90+ AI SEO Statistics, first-party clickstream + index2025
AhrefsAI Overview Brand Correlation, mention-quartile multiplier2025
AuthorityTechAI Citation 11% Platform Overlap Audit, 21,143 citations2026
Pew Research CenterGoogle AI summary click study, 900 US adults + browsing data2025
Princeton (Aggarwal et al.)GEO: Generative Engine Optimization, GEO-bench (KDD)2024
Search Engine LandAI search engines cite Reddit, YouTube, LinkedIn most2025
Read next

Related researchand the service it feeds

The Discovery Gap is one spoke of a larger measurement programme. The three reads below sit on the same data: the citation index that names which domains the engines already trust, the playbook that turns a citation gap into a content plan, and the checker that tests a single site against the engines today, so the gap on this page can be closed rather than only counted.

If the gap is the problem

Measure the gap.
Then close it.

FORKOFF built the AI Search Visibility Checker because the gap is the structural problem we solve. Run it on your own brand for the per-engine gap score. Pair the output with the cold email open rate benchmarks if you want to align outbound with the discovery layer. FORKOFF runs the three-lever fix as an engagement when the gap is wider than 60 points. Owning the methodology is the authority claim; the audit number is the call to action.

Authorship

Kshitij JK

Founder, FORKOFF

Reviewed by: Kartik Chugh

Last reviewed:

Published:

Methodology

The ASVC (AI Search Visibility Coverage) discovery-gap dataset is generated by running 12 paired branded-versus-head-term query sets against ChatGPT, Claude, Perplexity, and Gemini (48 datapoints per audit), then mapping cited URLs to domains and computing per-domain coverage. The surrounding aggregation adds statistics from 14 named authorities, each traced to a primary named source with a report title and year; untraceable figures were excluded. Methodology mirrors Princeton's GEO citation-analysis framework (KDD 2024) extended with FORKOFF's domain-disambiguation step that filters out parasite-SEO false-positive hits.

Sources cited

Have a question about this research methodology, or need help calibrating against your campaign data? Book a 30-min strategist call