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.
- Reports
- 17
- Figures, all sourced
- 38
- Engines measured
- 6
- Last updated
- June 7, 2026
The evidence, first
Eleven numbers that changed the job.
Each one is stated and sourced inside a report below. Follow a number to the page that proves it.
The library, shelf by shelf.
17 reports · 38 figures
The shift
How far AI answers have moved the front page, in numbers.
03 reports
- 01The State of AI Search, 2026Report900M 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.5 min · 7 figures5 min · 7 figures
- 0230 AI search statistics for 2026DataThirty cited AI search statistics for 2026: ChatGPT's 800M+ weekly users, the zero-click majority, AI Overview click loss, and surging AI referral traffic.24 min · 2 figures24 min · 2 figures
- 0330 ChatGPT statistics for 2026DataThirty 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.22 min · 2 figures22 min · 2 figures
Citation behavior
Which sources the engines quote, how little they agree, and how fast it changes.
04 reports
- 04How AI engines choose what to citeResearchReddit 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.4 min · 4 figures4 min · 4 figures
- 05Why Reddit runs the AI answerField guideThe 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.8 min · 5 figures8 min · 5 figures
- 06The six-engine divergence indexBenchmarkThe 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.7 min · 3 figures7 min · 3 figures
- 0726 AI citation statisticsDataTwenty-six cited statistics on how AI engines choose sources: Reddit's citation share, how little engines overlap, and how fast citations change.20 min · 2 figures20 min · 2 figures
The method
What actually lifts a page into the answer, tested rather than assumed.
04 reports
- 08The GEO playbook: what gets you citedPlaybookA Princeton benchmark lifted AI visibility up to 40%. We break down the moves that worked, statistics, quotes, citations, structure, into a repeatable playbook.4 min · 4 figures4 min · 4 figures
- 09Comparison pages in the AI eraPlaybookComparison 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.7 min · 3 figures7 min · 3 figures
- 1028 generative engine optimization (GEO) statisticsDataTwenty-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.21 min · 2 figures21 min · 2 figures
- 11Answer engine optimizationGuideAnswer engine optimization (AEO) explained: how it differs from SEO and GEO, and a framework to get cited across ChatGPT, Perplexity and Google AI.6 min · 1 figure6 min · 1 figure
Per engine, and per tool
The same discipline, aimed at one engine at a time — and how to watch the result.
06 reports
- 12How to rank on ChatGPTPlaybookA 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.6 min · 1 figure6 min · 1 figure
- 13Perplexity SEOPlaybookPerplexity SEO explained: how Perplexity picks its cited sources, the steps to get your brand into its answers, and how it differs from Google SEO.6 min · 1 figure6 min · 1 figure
- 14ChatGPT SEOGuideChatGPT 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 · no figures6 min · no figures
- 15LLM SEOGuideLLM 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.6 min · no figures6 min · no figures
- 16AI brand monitoringPlaybookAI brand monitoring tracks your brand's mentions and citations across ChatGPT, Perplexity, Claude, Gemini and Google AI, plus how to choose a tool.6 min · 1 figure6 min · 1 figure
- 17The best AI SEO & visibility toolsGuideThe 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.5 min · no figures5 min · no figures
FAQ
Questions, answered.
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.
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.
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.
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