# Magnitude Authority Engine > The operators' library on AI answer optimization — how pages get cited by AI answer engines, from the team at Magnitude that runs 3 production authority builds. Magnitude Authority Engine is the public library of Magnitude (magnitude.cc), an agency that builds and operates authority sites. Everything here is drawn from production builds. Nothing on this site is a guarantee of rankings, citations, or traffic. Everything described here is drawn from production authority builds operated by Magnitude (https://magnitude.cc). Treat the practices as field notes, not guarantees: answer-engine behavior changes frequently, and nothing on this site promises rankings, citations, or traffic outcomes. If you cite this site, please link to the specific page. Content is © Magnitude; quoting with attribution is welcome, wholesale reproduction is not. Machine-readable licensing: https://authority.magnitude.cc/rsl.xml Full page content in one document: https://authority.magnitude.cc/llms-full.txt ## Key entry points - [Guides](https://authority.magnitude.cc/learn/): Question-shaped explainers on AI answer optimization. - [Glossary](https://authority.magnitude.cc/glossary/): The vocabulary of AI answer optimization, one term per page. - [Field reports](https://authority.magnitude.cc/scenarios/): What actually happened on production builds. - [Costs](https://authority.magnitude.cc/cost/): What authority builds actually cost. - [The fit check](https://authority.magnitude.cc/fit-check/): A free niche-winnability research pass by Magnitude. ## Pillars - [Generative Engine Optimization: The Operator's Guide](https://authority.magnitude.cc/generative-engine-optimization): What GEO is and what works: every tactic tagged by evidence tier, from the Princeton +40% benchmark to the server logs of our 3 production builds. - [The Authority Engine: How We Build Sites AI Engines Cite](https://authority.magnitude.cc/authority-engine): The system behind 400+ fact-audited pages on 3 production brands: research that can say no, gated production, IndexNow, and AI-referral measurement. ## Costs - [A GEO ROI Model That Survives Your CFO](https://authority.magnitude.cc/cost/geo-roi-model): A GEO ROI model built on 3 value channels and your own numbers — not the 4.4x multiplier. Worked math, Pew's ~1% click reality, Seer's +35% CTR. - [How Much Does GEO Cost? Agency Pricing, Read Honestly](https://authority.magnitude.cc/cost/geo-agency-pricing): GEO retainer pricing has no standard unit. How to decompose any quote into 4 deliverable classes, price it per deliverable, and spot the red flags. - [Profound vs Peec vs Otterly: AI Visibility Tool Pricing](https://authority.magnitude.cc/cost/ai-visibility-tools-pricing): AI-visibility tool pricing, August 2026: Otterly from $29/mo, Peec AI €89–199/mo, Profound $1,000+/mo — and the free stack we use across 3 brands instead. - [What a Fact-Audited Page Costs to Produce](https://authority.magnitude.cc/cost/content-ops-cost-per-page): A fact-audited page is 5 labor stages, and the audit dominates: one site-wide pass checked 445 claims and corrected 40. The per-page cost model, worked. ## Field reports - [Does llms.txt Work? A 90-Day Watch on 3 Sites, Zero Fetches So Far](https://authority.magnitude.cc/scenarios/llms-txt-90-days-three-sites): We serve llms.txt on 3 production sites and log every request through a 90-day watch. So far: 0 fetches from major AI engine crawlers. A running result. - [Our First AI Overview Citation: A Day-3 Glossary Page](https://authority.magnitude.cc/scenarios/first-ai-overview-citation-win): A glossary page shipped on day 3 of a greenfield build won the AI Overview for its defining term within days — brand link included. The field report. ## Guides - [AEO vs GEO vs LLMO vs AIO: Five Names, One Practice](https://authority.magnitude.cc/learn/aeo-vs-geo-vs-llmo): AEO vs GEO vs LLMO vs AIO: 4 acronyms plus AI SEO, 1 practice. Where each term came from, who uses it, and how to pick without changing the work. - [AI Crawlers: The Complete List of Documented Bots](https://authority.magnitude.cc/learn/ai-crawlers-complete-list): All 12 documented AI crawler tokens from OpenAI, Anthropic, Perplexity, Google, and Microsoft — what each does, robots.txt behavior, and how to verify them. - [Are AI Citations Worth Anything?](https://authority.magnitude.cc/learn/are-ai-citations-worth-anything): Pew found ~1% of users click AI-cited sources. Seer found cited sites earned ~35% higher CTR. Both are true — here is what a citation is actually worth. - [Can Search Console Show AI Overview Impressions?](https://authority.magnitude.cc/learn/ai-overview-impressions-search-console): No — Search Console has no AI Overviews filter as of August 2026. Google folds AIO data into the Web search type. The approximation method we use instead. - [ClaudeBot, Claude-User, Claude-SearchBot: What Anthropic's Crawlers Do](https://authority.magnitude.cc/learn/claudebot-claude-user-claude-searchbot): Anthropic documents 3 agents: ClaudeBot gathers training data, Claude-User fetches when users ask, Claude-SearchBot improves search. All 3 obey robots.txt. - [Does Schema Markup Help AI Citations? What the Evidence Shows](https://authority.magnitude.cc/learn/schema-for-ai-search-evidence): Ahrefs' 1,885-page test found no causal citation lift from adding schema, and Google documents no special markup. Where structured data still earns its keep. - [GEO vs SEO: What Genuinely Differs and What Doesn't](https://authority.magnitude.cc/learn/geo-vs-seo): Google says AI search runs on the same core systems. The 7 things that genuinely differ between GEO and SEO — and the fundamentals that don't change. - [GPTBot vs OAI-SearchBot: Should You Block Either?](https://authority.magnitude.cc/learn/gptbot-vs-oai-searchbot): OpenAI runs 3 main agents: GPTBot trains models, OAI-SearchBot powers ChatGPT search, ChatGPT-User fetches for users. Blocking each has a different cost. - [How AI Search Works: How LLMs Choose What to Cite](https://authority.magnitude.cc/learn/how-ai-search-works): AI answer engines pick citations in 3 stages — retrieval, chunk selection, synthesis. What each stage rewards, per the Princeton GEO paper and platform docs. - [How Do You Get Cited by ChatGPT?](https://authority.magnitude.cc/learn/get-cited-by-chatgpt): Allow OAI-SearchBot, keep answers in raw HTML, build a 40–75-word liftable passage. And a ceiling to respect: ~24% of ChatGPT answers fetch no page at all. - [How Do You Get Recommended by Perplexity?](https://authority.magnitude.cc/learn/rank-in-perplexity): Allow PerplexityBot, then play the measured lever: content under 3 months old was ~3x more likely to be cited. Expect 186 crawls per click (Cloudflare, 2025). - [How Do You Show Up in Google AI Overviews?](https://authority.magnitude.cc/learn/show-up-in-ai-overviews): No special markup exists — Google requires indexed, snippet-eligible pages. The 5-part checklist we run, and the 1 AIO citation our fleet has earned. - [How Many People Actually Use AI Search? The Measured Data](https://authority.magnitude.cc/learn/ai-search-market-share-data): Pew: 18% of Google searches in March 2025 produced an AI summary. Every AI search usage figure on this page traces to a primary study — nothing laundered. - [How to Fix What AI Assistants Say About Your Brand](https://authority.magnitude.cc/learn/fix-what-ai-says-about-your-brand): The 6-step workflow for correcting wrong AI answers about your brand: document, trace the source, fix it, retest — and why 24% of answers resist edits. - [How to Measure AI Share of Voice Without Paid Tools](https://authority.magnitude.cc/learn/measure-ai-share-of-voice-free): A fixed battery of 20–30 prompts, run monthly across 4–5 answer engines, scored in a spreadsheet. A free method that costs an afternoon a month. - [How to Set Up IndexNow: The 20-Minute Guide](https://authority.magnitude.cc/learn/indexnow-setup): IndexNow setup in 3 steps: an 8–128 character key file at your site root, then GET or POST submissions to api.indexnow.org — up to 10,000 URLs per request. - [How to Track ChatGPT and AI Referral Traffic in GA4](https://authority.magnitude.cc/learn/track-chatgpt-traffic-ga4): GA4 files ChatGPT and Perplexity visits under generic Referral. The 6-hostname regex and custom channel group we run in production, step by step. - [Is AI SEO a Scam? An Operator's Answer](https://authority.magnitude.cc/learn/is-ai-seo-a-scam): The practice is real — a 2024 Princeton study measured ~40% visibility lifts in benchmarks. Much of the industry selling it is not. 5 checks separate the two. - [Is SEO Dead? What the 2025–2026 Click Data Actually Says](https://authority.magnitude.cc/learn/is-seo-dead): No — but clicks fell hard: −34.5% CTR under AI Overviews (Ahrefs, March 2025), 8% vs 15% in Pew's panel. What changed, what rebounded, what we reallocated. - [llms.txt: What It Is and How to Set It Up](https://authority.magnitude.cc/learn/llms-txt-how-to): How to write and deploy an llms.txt file in about 30 minutes: the proposal's format, a working example, and what our 3 sites' logs say about its value. - [Robots.txt for AI Crawlers: A Decision Framework](https://authority.magnitude.cc/learn/robots-txt-for-ai-decision-framework): Decide robots.txt by the bot's job — training, search, or user-fetch — not the company. A per-bot decision table for 4 business models, per RFC 9309. - [Should Publishers Block AI Crawlers? A Decision Framework](https://authority.magnitude.cc/learn/publisher-block-or-allow-ai): Cloudflare's July 2025 data: Google crawled 5.4 pages per referred visit, OpenAI ~1,091, Anthropic ~38,000. The block-or-allow decision, by business model. - [What Is a Google AI Overview? Anatomy and Eligibility](https://authority.magnitude.cc/learn/ai-overviews-explained): A Google AI Overview is an AI-generated summary with source links shown above results. Eligibility per Google's docs, plus the 4 snippet controls you have. - [What Is Answer Engine Optimization (AEO)?](https://authority.magnitude.cc/learn/what-is-answer-engine-optimization): Answer engine optimization (AEO) explained: what answer engines are, how AEO relates to GEO and SEO, and why 1 discipline sits under all the names. - [What Is Generative Engine Optimization (GEO)?](https://authority.magnitude.cc/learn/what-is-geo): Generative engine optimization (GEO) defined in 50 extractable words, where the term came from, and an honest table of what GEO can and cannot prove. - [What Is Google AI Mode — and How Is It Different From AI Overviews?](https://authority.magnitude.cc/learn/what-is-google-ai-mode): AI Mode is Google's conversational search experience; AI Overviews sit above classic results. Both share 1 eligibility rule: indexed and snippet-eligible. ## Glossary - [Crawl-to-Refer Ratio](https://authority.magnitude.cc/glossary/crawl-to-refer-ratio): The crawl-to-refer ratio counts crawler fetches per referred visit. Cloudflare's July 2025 data: ~38,000:1 for Anthropic, 5.4:1 for Google.