Priority 01
Accessibility beats cleverness
The highest-evidence AI citation factor is simply whether the URL can be reached and previewed. In Cyrus Shepard’s May 2026 meta-analysis of 54 studies, URL accessibility scored 9.5/10 and preview control 9.2/10, meaning a page blocked by robots.txt, returning a non-200, sitting behind a paywall, or suppressing snippets via nosnippet is excluded before any content quality is assessed.
Google adds a second gate that is easy to miss: to be eligible for generative AI features, a page must be indexed, eligible to appear with a snippet, and the site must be included in Search generative AI features in Search Console.
Sources: Zyppy AI Citation Ranking Factors, May 2026. Google Search Central, AI optimisation guide, updated 10 July 2026.
Priority 02
Classic ranking is still the base layer
Search rank scored 9.4/10, the second-highest factor, so AEO does not replace SEO, it compounds it. In the organic-only analysis, Ahrefs’ analysis of 863,000 SERPs and 4 million AI Overview URLs found only 37.1% of cited URLs rank in the organic top 10, with 26.2% ranking 11 to 100 and 36.7% outside the top 100 entirely. These scores are the author’s assessments in an evidence review, not official ranking weights or proof of causation.
These findings help form hypotheses and choose checks; they do not establish the effect of a particular change on your site. Compare repeated observations on the agreed prompt set, record implementation changes and limitations, and investigate alternative explanations. Report an association rather than claiming that an intervention caused the change.
Sources: Ahrefs, AI Overview citations and top 10, 2026. Zyppy, May 2026.
Priority 03
Fan-out means clusters, not keywords
Google’s documentation confirms AI features use query fan-out: a set of concurrent related queries generated to fetch additional results before an answer is composed. Fan-out rank scored 9.3/10 and topic-cluster ranking 8.9/10 in the same evidence review, the strongest content-strategy signals measured. These scores are the author’s own assessments of the collected evidence, not official ranking weights or proof of causation.
So AEO content planning starts from a question map, not a keyword list. Google also warns against the obvious abuse of this: spinning up a page per fan-out variant is scaled content abuse under its spam policies, and it does not work.
Sources: Google Search Central, AI features and AI optimisation guides. Zyppy, May 2026.
Priority 04
Mentions outperform links
In Ahrefs’ 26 May 2025 study of 75,000 selected brands, branded web mentions correlated 0.664 with AI Overview visibility, against 0.218 for raw backlink counts, roughly 3 times stronger. Branded anchor text at 0.527 and branded search volume at 0.392 also had higher correlations than Domain Rating at 0.326. These are observational correlations, not evidence that buying mentions causes an improvement.
These findings help form hypotheses and choose checks; they do not establish the effect of a particular change on your site. Compare repeated observations on the agreed prompt set, record implementation changes and limitations, and investigate alternative explanations. Report an association rather than claiming that an intervention caused the change.
Source: Ahrefs, 26 May 2025, 75,000-brand AI visibility correlation study.
Priority 05
Structure, then freshness
Answer-near-the-top scored 8.8/10, AI-ready structure 8.6/10, self-contained passages 8.0/10 and freshness only 7.0/10. Ahrefs’ 28 July 2025 study analysed 16.975 million cited URLs and observed differences in cited-page age across platforms. Its narrative and organic-SERP table use inconsistent comparison values, so this page does not treat the reported difference as a precise universal benchmark. Content age is not the same measure as the effect of an update. These scores are the author’s assessments in an evidence review, not official ranking weights or proof of causation.
For the widely repeated 4.3-times claim, we could not trace a primary study for this figure. ChatGPT does skew freshest of the major engines at about 958 days.
Sources: Zyppy, May 2026. Ahrefs content-freshness study, 28 July 2025, 16.975M cited URLs.
The honest part
Three things I will not sell you
No guaranteed AI citations. Nobody controls what a model quotes, and AI Overviews are probabilistic. The same query can return different sources hours apart.
No llms.txt as a ranking factor. Google states plainly that Google Search does not use llms.txt, and it scored lowest of 23 factors at 2.0/10. I will implement one if you want it for other crawlers. I will not bill it as AEO. These scores are the author’s assessments in an evidence review, not official ranking weights or proof of causation.
No AEO instead of SEO. Google’s position and the citation data agree: generative features are grounded in core Search systems. Anyone selling AEO as a replacement for SEO is selling you half a strategy.
Sources: Google Search Central AI optimisation guide, updated 10 July 2026. Zyppy, May 2026.