Industry report · CLX-GEO-2026-06
The 9 ranking signals AI search engines actually use, scored across ChatGPT, Perplexity, Claude, Gemini, Google AI Overviews, and Microsoft Copilot. Per-engine weighting, consensus signals, and the surface mechanics that change every few months.
Executive summary
Build for the 5 consensus signals first — complete schema, FAQPage structure, quotable sentences, named authors, third-party mentions. This is the highest-leverage GEO work because it benefits every engine simultaneously. Then layer engine-specific weighting on top.
The 9 signals
Signal 1 · Consensus
Engine-specific bots: GPTBot · ClaudeBot · PerplexityBot · Google-Extended · Applebot-Extended. Block any = invisible to that engine.
Signal 2 · Consensus
Organization · LocalBusiness · Service · FAQPage · Article. All present, all valid. AI engines treat schema-complete pages as higher-confidence sources.
Signal 3 · Consensus
Short factual declarative sentences with numbers. "Migration in 2–4 weeks at 50–70% lower cost" beats "passionate about modern architectures."
Signal 4 · Consensus
Real questions, direct answers, FAQPage JSON-LD wrapping. Highest-extraction format across all engines.
Signal 5 · Consensus
Visible datePublished, dateModified, Person schema for authors. Provenance-free content loses citations.
Signal 6 · Engine-specific
Highest weight for ChatGPT and Claude. Medium for Perplexity. Lower for AI Overviews (Google substitutes its own authority signals).
Signal 7 · Engine-specific
Highest weight for AI Overviews and ChatGPT (local recommendations). Medium for Claude and Perplexity.
Signal 8 · Engine-specific
Pillar + supporting + city × vertical matrix. Highest weight for AI Overviews. Medium for ChatGPT and Perplexity.
Signal 9 · Engine-specific
Highest weight for Perplexity (fastest-reflecting engine). Medium for ChatGPT Search. Lower for Claude default mode.
Per-engine top 3
ChatGPT
FAQ extraction is high. llms.txt is parsed. Search mode uses Bing partnership.
Perplexity
Highest citation density of any engine (5–10 sources per answer). Fastest-reflecting.
Claude
Trust-signal-dominant. Conservatively declines unverifiable citations.
Gemini
Inherits most Google ranking signals. Schema completeness is a separate strong factor.
AI Overviews
Page must generally rank well for the underlying query first. Then schema + author/publisher trust signals.
Copilot
Uses Bing index. Schema-complete + branded entity beats unbranded thin content.
FAQ · 8 questions
Crawler access · complete schema · quotable phrasing · FAQPage structure · named authors + dates · third-party mentions · entity consistency · topical density · freshness.
Crawler access · brand mentions · quotable phrasing.
Crawler access · freshness · source diversity. Highest citation density of any engine.
Named authors + dates · internal consistency · crawler access. Trust-signal-dominant.
Underlying Google ranking · schema · E-E-A-T. Page generally must rank well first.
5 consensus signals: schema · FAQPage · quotable sentences · named authors + dates · third-party mentions. Highest-leverage GEO work.
Observed to be parsed by ChatGPT, Perplexity, Claude as entity-grounding. Not a formal ranking signal documented by any engine. Helps most on small-to-medium sites.
Surface (crawler names, robots.txt, model versions) — every few months. Underlying 9 signals — stable since first RAG generation, likely stable through 2027.
Read next
Primary sources & references
This report cites only first-party publisher disclosures, official developer documentation, and crawler-confirmed behavior from the Click2.ai measurement panel. No second-hand statistics.
Google · Jun 3, 2026
Source for the AI Overviews 2.5B MAU and AI Mode 1B MAU figures used in the AI Overviews engine section. Also covers the new Search Console opt-out toggle and Google-Extended.
Google Developers
Authoritative list of Google's crawler user agents and robots.txt tokens, including Googlebot, Google-Extended (Gemini training + grounding), GoogleOther, Google-CloudVertexBot, Googlebot-News.
Google Developers
Google's official guidance on improving site visibility in generative AI Search features — unique non-commodity content, structure, page experience, high-quality images.
IndexNow protocol
Cross-engine URL submission protocol used by Bing, Yandex, Naver, Seznam. Underpins the freshness signal observed for ChatGPT Search and Bing Copilot.
Click2.ai · case study
First-party measurement data from the Click2.ai program: page count, schema coverage, IndexNow HTTP 200 confirmation, 20-prompt monthly measurement panel. Dataset schema, CC-BY 4.0.
Click2.ai · playbook
The operational checklist that turns the 9 signals in this report into concrete weekly work.
LinkedIn · discussion
The Click2.ai post unpacking the 2.5B AI Overviews number from Google's June 3 announcement and the 9-step practitioner response. Comments open.
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