Four things prove AI search optimization did something: crawler access, citations with a source link, named brand mentions without a link, and referral or lead signals you can trace back to an AI answer. Citations in AI answers usually take 2–8 weeks to show up, and a brand-new domain needs about 3 months of observation before any of these numbers mean much (timeline for AI citations). A fifth number, brand search volume, moves too — but it's shaped by ads, seasonality, and word of mouth, so don't treat it as proof of GEO work on its own.
The four metrics, side by side
| Metric | What it actually shows | Where to check it |
|---|---|---|
| Crawler access | Whether AI bots (GPTBot, ClaudeBot, PerplexityBot) can reach your pages at all | Server logs, the free 24-item AI-visibility audit |
| Citation | AI answer lists your URL as a source | Manual test prompts in ChatGPT/Perplexity, search console-style tools that track AI referrers |
| Mention | AI names your brand in the answer text, no link attached | Same test prompts, read the answer body not just the footnotes |
| Referral/lead | A visitor or lead whose referrer is an AI platform | Analytics referrer segment, CRM source field |
Crawler access: can the bot even reach the page
Before anything else, confirm AI crawlers aren't blocked by robots.txt, server rules, or JS-only rendering. This is the fastest check because it doesn't depend on waiting — you can confirm it the same day. It's also the first thing the free 24-item AI-visibility audit checks, since a page that's invisible to crawlers can never be cited no matter what else is right. For background on what GEO covers beyond this step, see what GEO actually optimizes for.
Citation vs. mention — keep them separate
A citation means the AI answer lists your page as a source, usually as a clickable link or footnote. A mention means the AI names your brand inside the answer text but doesn't attribute a link — the user has to search for you separately to land on your site. Both are real signals, but they're not interchangeable: a citation drives direct traffic, a mention only drives brand recall. For local businesses, a map card appearing inside an AI answer is a combined event — it's both crawler access and a citation at once (see how AI map cards work for local businesses).
Referral and lead signals: the traceable part
Citations and mentions are what the AI shows; referral and lead signals are what actually reaches your site. Segment analytics by referrer domains like chatgpt.com, perplexity.ai, or copilot.microsoft.com, and tag leads that mention finding you through an AI assistant. This is the only category in the list that connects directly to revenue, and it's also the slowest to build volume, since it depends on citations existing first.
Brand search volume: a downstream signal, not proof
Branded search volume can rise after a mention, but it also rises from ads, press, referrals, and plain word of mouth. Track it as a separate line item, not as evidence that AI search optimization caused the increase — there's no clean way to isolate the cause from that number alone.
When each metric becomes meaningful
- Crawler access: check immediately, re-check after any site change.
- Citations and mentions: usually take 2–8 weeks to appear in AI answers; a brand-new domain needs about 3 months of observation before the absence of citations means anything.
- Referral/lead signals: only worth reading after citations have had time to appear — reading them earlier just measures noise.
- Brand search volume: review monthly alongside the other three, never alone.
What a monthly report should show — and what it can't promise
A usable report shows the audit checklist status (pass/fail across the 24 items), a list of test prompts and whether your brand appeared as a citation or a mention in each, and a referrer-segmented traffic count. What no vendor can responsibly promise is a guaranteed citation rate or a guaranteed ranking position — whether an AI model chooses to cite a given page on a given day is probabilistic, and no one controls the model's selection logic. Service scope varies by tier: a one-time AI readiness fix on an existing site runs ฿12,900, a new AI-ready site build runs ฿14,900, and ongoing work with monthly reporting runs ฿49,900/mo.
Verifying a GEO vendor actually worked before you renew
- Re-run the same free 24-item audit you started with and compare pass/fail counts.
- Re-run the same set of test prompts used at the start of the engagement and log citation vs. mention counts side by side.
- Pull the referrer-segmented traffic report for the full period, not just the last week.
- Check whether the timeline matches expectations — citations typically take 2–8 weeks, and a new domain needs about 3 months before absence of results is meaningful.
- Ask what changed on the site itself (schema, crawlability, content structure) — a report with no site changes listed is a red flag regardless of the traffic numbers.