Every AEO vendor publishes a list of AI systems they cover. The lists differ, nobody explains why, and the implication is always that longer is better.
Longer isn't better. Measuring a system your buyers don't use costs the same as measuring one they do, and it tells you nothing. Here's how we pick the six we cover by default, and why two obvious candidates didn't make the list.
The test: would your buyer ask this thing?
A system belongs in your set if someone who could buy from you would actually ask it about vendors. Not "is it popular." Not "does it score well on benchmarks." Would your buyer ask it about companies like yours.
That question knocks out more candidates than you'd expect.
The six
ChatGPT. The default. It's the system people mean when they say "I asked AI," and it's where the majority of vendor-selection questions land. If you measure only one thing, measure this.
Google — AI Overviews, AI Mode and Gemini. Three surfaces, one vendor. AI Overviews matters most and gets discussed least, because nobody chooses it: the AI answer appears above the search results whether the user asked for it or not. That makes it the widest-reaching AI answer surface in the US. AI Mode and the Gemini app answer the same question differently, so we check all three — but on the list that's one system, not three. Counting them separately makes a list look longer without covering anything more.
Claude. Smaller audience, unusually concentrated: engineers, analysts, consultants, founders. If you sell B2B services or technical products, the person who evaluates you is disproportionately likely to be here. Low volume, high buying authority.
Perplexity. Built around answers with sources. It cites, and people click the citations. That makes it the most useful diagnostic in the set: if Perplexity won't cite you, it's almost always because your pages aren't written in a form it can lift facts from — and you can see exactly whose page it used instead.
Microsoft Copilot. Nobody's favorite assistant, and that's the point. It's in Windows, Edge, Bing and Microsoft 365, so for a lot of corporate buyers it's simply the one already open when a question comes up.
Grok. Built into X, with web search and citations. Its audience skews toward founders and professionals, which is why it earns a slot for B2B.
Why not Meta AI
Meta AI has enormous reach — WhatsApp, Instagram, Messenger, Facebook. On raw user numbers it beats several systems on our list.
It's still not in the default six, because reach isn't the test. The test is whether buyers ask it about vendors.
Meta AI lives inside social and messaging apps, so it gets the questions people have while messaging: recipes, plans, translations, help drafting a reply. "Which agency should we hire to automate our call center" isn't a WhatsApp question. It's the kind of question people ask at a desk, in a tool they associate with work.
This isn't about quality. It's about intent. What makes a system worth measuring is the kind of question it receives, not the number.
Two cases where we'd add it right away: if you sell direct to consumers, or if your customers are in a market where WhatsApp is how businesses actually talk to people. In those markets it stops being a social app and becomes a sales channel. Tell us and we'll cover it.
Why not DeepSeek
Same logic. DeepSeek is capable and widely used — just not by US B2B buyers deciding who to hire. If your customers are somewhere it's popular, it belongs in your set. Different buyers, different list.
That's the point most published lists miss: there is no correct global set. The right six depends on where your buyers are, and a set built for one market will be half wrong in another.
What if we're wrong about your market?
We might be. You know your buyers better than we do.
The base set is six systems, and any of them can be swapped for another at no extra cost — Meta AI, DeepSeek, an industry-specific assistant, your own internal model. The methodology doesn't change when the system does. If you need more than six covered, we'll do that too; it's quoted separately.
The free express check covers three systems. That's a limit on volume, not on choice — you pick which three.
The part that matters more than the list
Covering a lot of systems stopped being a differentiator a while ago. Everyone lists them now.
What still separates a real measurement from a screenshot is repetition. Ask the same question twice and you get two different answers, so a single run tells you about one moment, not about your visibility. We run each query five times and report how often you appear — "named in 2 answers out of 5" — because that's the only version of the number that holds up when you check it yourself the following week.
Ten systems with one run each is less measurement than four systems done properly. Ask about runs before you ask about logos.
FAQ
How do you decide which AI systems to measure?
One test: would someone who could buy from you actually ask that system about companies like yours? Not which system is biggest — which one gets buying questions. That gives six: ChatGPT, Google (AI Overviews, AI Mode and Gemini), Claude, Perplexity, Microsoft Copilot and Grok. We count vendors, not screens — Google’s three surfaces answer differently and we check all three, but that is one system on the list, not three.
Why is Meta AI not in the default set?
Because its questions are messaging-app questions, not vendor-selection questions, despite its reach. If you sell direct to consumers, or your buyers live in WhatsApp, we swap it in at no extra cost.
Can the list be changed?
Any of the six can be swapped. More than six is available and quoted separately. The free express check covers three systems of your choosing.
Full method and pricing: AI Search Optimization. Start with the free visibility check.
Author: Iskander Zalyalov, AI4Live LLC · ai4live.com
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