The Mentionova research library

The new front page is an AI answer. We measure it.

Field reports on how AI search actually works, which engines cite which sources, where visibility is won and lost, and how fast buying behavior is moving. Numbers-forward, every claim sourced.

ReportLive

The State of AI Search, 2026

900M weekly ChatGPT users, a 25% drop in classic search, and a zero-click majority. The data behind the shift from ten blue links to one answer.

12 min · 9 charts
ResearchLive

How AI engines choose what to cite

Reddit drives 40% of AI citations; the WSJ doesn't crack the top 20. A teardown of citation behavior across ChatGPT, Perplexity, Gemini and Google AI, and why it swings overnight.

11 min · 7 charts
PlaybookLive

The GEO playbook: what gets you cited

A Princeton benchmark lifted AI visibility up to 40%. We break down the moves that worked, statistics, quotes, citations, structure, into a repeatable playbook.

13 min · 8 charts
Field guideLive

Why Reddit runs the AI answer

The community platform the models trust most, 40% of all AI citations. Why they trust it, what kind of thread gets cited, and the three reasons that trust is fragile.

9 min · 5 charts
PlaybookLive

Comparison pages in the AI era

Comparison content is the highest-cited format on ChatGPT (95%). Why "X vs Y" pages win the citation, how to structure one, and why owning it isn't enough.

8 min · 3 charts
BenchmarkLive

The six-engine divergence index

The same prompt, six different verdicts. Engines share just 11% of cited sources, how far apart ChatGPT, Perplexity, Gemini and Google AI really are about one brand.

10 min · 3 charts
PlaybookLive

AI brand monitoring

AI brand monitoring tracks your brand's mentions and citations across ChatGPT, Perplexity, Claude, Gemini and Google AI, plus how to choose a tool.

7 min · 1 chart
DataLive

26 AI citation statistics

Twenty-six cited statistics on how AI engines choose sources: Reddit's citation share, how little engines overlap, and how fast citations change.

9 min · 2 charts
DataLive

30 AI search statistics for 2026

Thirty cited AI search statistics for 2026: ChatGPT's 800M+ weekly users, the zero-click majority, AI Overview click loss, and surging AI referral traffic.

9 min · 2 charts
GuideLive

The best AI SEO & visibility tools

The best AI SEO and visibility tools in 2026: what each tracks, who it's for, and how to monitor your brand across ChatGPT, Perplexity and Google AI.

8 min
GuideLive

Answer engine optimization

Answer engine optimization (AEO) explained: how it differs from SEO and GEO, and a framework to get cited across ChatGPT, Perplexity and Google AI.

9 min · 1 chart
GuideLive

ChatGPT SEO

ChatGPT SEO explained: whether traditional SEO works on ChatGPT, how it differs from Google SEO, and how to optimize your brand in ChatGPT answers.

6 min
DataLive

30 ChatGPT statistics for 2026

Thirty cited ChatGPT statistics for 2026: 900M weekly users, $10B revenue, the fastest app ever to 1B downloads, and how much traffic it sends the web.

9 min · 2 charts
DataLive

28 generative engine optimization (GEO) statistics

Twenty-eight cited GEO statistics on what gets content cited by AI: Princeton study's per-method lifts, answer capsules, page length, and off-page signals.

10 min · 2 charts
PlaybookLive

How to rank on ChatGPT

A step-by-step playbook to get your brand cited in ChatGPT's answers: what the model reads, the seven moves that earn a mention, and how to track it.

7 min · 1 chart
GuideLive

LLM SEO

LLM SEO explained: how LLMs like ChatGPT, Claude and Gemini decide which brands to mention, how to optimize for them, and how to measure your visibility.

7 min
PlaybookLive

Perplexity SEO

Perplexity SEO explained: how Perplexity picks its cited sources, the steps to get your brand into its answers, and how it differs from Google SEO.

7 min · 1 chart
FAQ

Questions, answered.

What is AI search?+
AI search is when people get a synthesized answer from an engine like ChatGPT, Perplexity, or Google AI Overviews instead of a list of links. The engine reads many sources and writes one response, citing a handful of them.
How do AI engines decide what to cite?+
They weigh signals like content structure, the presence of statistics and quotations, third-party mentions, and source trust, and the weighting differs sharply by engine. Our citation research breaks the patterns down with data.
Where does Mentionova's research data come from?+
From running large sets of real buying questions across the major AI engines and measuring which brands and sources appear and get cited. The pieces here are numbers-forward and list their sources.