Do ChatGPT, Gemini and Perplexity recommend the same businesses?

No. Asked the same questions about Allergy & Immunology in Brownsville, the closest any two engines came to agreeing was 100% of the practices they named (Claude & Perplexity), and the furthest apart agreed on just 0% (Perplexity & Google AI Overview). Claude named 1, Perplexity named 1.

The Local AI Visibility Index

Brownsville Allergy & Immunology

Q: Does ranking well on Google mean AI recommends you?

It helps, and it is not enough. Of the 2 best-ranked Allergy & Immunology practices in Brownsville, 0 were named by an AI answer engine — 0%. Of the 2 ranked lowest, 0 were.

Q: How many local businesses actually appear in AI answers?

Very few. Of 6 Allergy & Immunology practices measured in Brownsville, 0 were named at least once and 6 were never named. The three most-named practices took 0% of every mention in the market.

Q: Are the best-reviewed local businesses visible in AI answers?

Often not. Take the 1 strongest practices in Brownsville — the top 25% once you combine Google rank, star rating and number of reviews — and 1 of them (100%) were named by no AI engine at all.

We asked 5 AI answer engines 10 questions a prospective patient would actually ask, then measured which of the market’s 6 practices got named. 6 of them never came up once.

Market: Brownsville, TX
Practices: 6
Questions: 10
Engines: 5
Measured: July 2026

Every practice in the market · one dot each · ordered by Google Maps rank · lit = named by at least one engine

Named by AI — 0 practicesNever named — 6 practices

100%

of Allergy & Immunology practices in Brownsville were named in none of the 50 AI answers we collected.

Finding 01

Does ranking well on Google mean AI recommends you?

It helps, and it is nowhere near enough. Of the 2 best-ranked practices in Brownsville, 0 got named by an AI engine — 0%. Of the 2 ranked lowest, 0 did.

Google rank and AI answers are decided by two different systems looking at different things. Your map position comes from how close you are, what category you are in, and how people engage with your listing. Whether an AI names you depends on whether it can find, read and trust a description of your practice in the sources it pulls from. Ranking first buys you better odds. It does not buy you the answer.

Google Maps rank vs getting named — Brownsville
Where they rank on Google Maps	Named by AI	Share
The 1st third — best ranked on Maps	0 of 2	0%
The middle third	0 of 2	0%
The bottom third	0 of 2	0%

Finding 02

How many local businesses actually appear in AI answers?

Very few, and the ones that do take most of it. Of 6 practices measured, 0 were named at least once and 6 were never named. The three most-named practices took 0% of every mention in the market.

6 practices0%

Bar length is the share of all 50 answers, so a full bar would mean every answer named them.

Finding 03

Are the best-reviewed practices invisible to AI?

Often, yes. Take the 1 strongest practice in Brownsville — the top 25% once you combine Google rank, star rating and number of reviews — and 1 was never named by any engine. That is 100% of the best practices in town, missing from every answer.

One of them ranks 2nd on Maps with 4.6 stars, and was named zero times across all 50 answers. Their patients rate them highly and Google ranks them well. The AI engines do not know they exist.

Why this matters more than who came first. The practices at the top of this market are already competitive. The practice with the most to gain is the 1 practice that earned a top-25% reputation and gets none of the benefit of it in AI answers.

Finding 05

Do ChatGPT, Gemini and Perplexity recommend the same practices?

No. Asked the same questions about the same market, the closest any two engines came to agreeing was 100% of thepractices they named — and the furthest apart pair agreed on just 0%.

Each engine surfaced a different slice of the market: Claude named 1, Perplexity named 1. Showing up in one does not mean showing up in the others, so checking yourself against a single assistant tells you very little.

Of the 1 practice named by any of the three, all three agreed on 0.

How often two engines named the same business
Engine pair	Agreed on
Claude & Perplexity	100.0%
ChatGPT & Claude	0.0%
ChatGPT & Perplexity	0.0%
Claude & Gemini	0.0%
Claude & Google AI Overview	0.0%
Gemini & Perplexity	0.0%
Perplexity & Google AI Overview	0.0%

How we measured it

We pulled every Allergy & Immunology practice Google Maps returns for Brownsville — 6 of them, after combining duplicate listings of the same practice — then asked 5 AI answer engines the same 10 patient questions and recorded which ones each engine named.

Who is in it: 6 practices, from everything Google Maps returns for "allergist" in Brownsville, TX. A practice with more than one listing is counted once. 2 listings that share one organization's website are counted as that organization, because AI engines cite the organization's site rather than any individual listing.
What we asked: 10 questions a patient would actually ask, kept identical across ChatGPT, Claude, Gemini, Perplexity and Google's AI Overview. 50 answers in total, July 2026.
How we scored it: The share of answers that named or cited a practice, weighted by how many people use the engine that named it.
How we ranked reputation: Google Maps position, star rating adjusted for how many reviews back it up, and review count on a sliding scale that levels off around a thousand.
Scope: One market, one category. Every number on this page describes Brownsville and comes from that market alone — results differ between markets and we do not carry them across. We never name individual practices. AI engines change over time; this describes July 2026.

For anyone who wants the statistics

The findings above are counts, which is how most people want to read them. Here are the same relationships as correlations, for readers who prefer them.

Reputation signals vs getting named — 6 practices
What we measured	How closely it tracked	What that means
Google Maps rank	+0	No connection
Review count	+0	No connection
Star rating	+0	No connection

Reading the middle column: 0.0 means the two things had nothing to do with each other. 1.0 would mean they moved together perfectly. A minus sign means they moved in opposite directions. Anything under about 0.2 either way is noise.