GEO vs SEO: How ChatGPT, Perplexity & Gemini Choose Which Businesses to Recommend

By Haroon Shahbaz, Founder of Rank It Globally · Published October 19, 2026 · Last updated October 19, 2026

How we put this together: every technical claim is checked against the platforms' own documentation (Google Search Central, OpenAI, Perplexity, Anthropic and Microsoft Bing) and published research, linked in the Sources section. The practical advice comes from the AI visibility audits we run for US small businesses across ChatGPT, Perplexity, Gemini and Google AI Overviews.

Disclosure: Rank It Globally sells AI SEO & GEO services. Everything in this guide can be done without hiring us.

Quick answer: GEO (generative engine optimization) is the work of getting your business named and cited inside AI answers from ChatGPT, Perplexity, Gemini and Google's AI Overviews. SEO earns you a ranked link; GEO earns you a mention in the answer itself. For small businesses, GEO doesn't replace SEO. It's built on top of it.

Key takeaways

• SEO gets you ranked; GEO gets you recommended. Same foundation, different finish line.
• AI tools search the web before they answer. If Google or Bing can't find and trust your pages, ChatGPT, Perplexity and Gemini can't recommend you either.
• Four signals decide whether you're named: entity clarity, quotable answers, third-party proof and search authority.
• There's no secret AI markup. Google says AI Overviews and AI Mode have no extra technical requirements beyond normal SEO, but your robots.txt must let the right AI crawlers in.
• You can measure it today with 10 prompts, Search Console, Bing Webmaster Tools and GA4 (all covered below).

What Is SEO?

Search engine optimization (SEO) is the work of helping your website rank in search engines like Google and Bing so people click through to you. It covers three areas: technical (can search engines crawl, load and index your pages?), content (do your pages answer what people search for?) and authority (do other sites, reviews and links vouch for you?). For local businesses it also includes your Google Business Profile and the Map Pack. If you want the full picture of how Google decides who ranks, our guide on why websites don't show up on Google covers it.

What Is GEO (Generative Engine Optimization)?

Generative engine optimization (GEO) is the practice of making your business easy for AI tools to find, understand, trust and quote, so that when someone asks ChatGPT, Perplexity, Gemini or Google's AI Mode for a recommendation, your name is in the answer.

Where the term GEO comes from

The term comes from a 2023 research paper, GEO: Generative Engine Optimization, by researchers from Princeton University, Georgia Tech, the Allen Institute for AI and IIT Delhi, presented at the ACM KDD conference in 2024. They tested how different content changes affected whether a page showed up in AI-generated answers. Adding statistics, quotations and cited sources increased visibility by up to 40%, while keyword stuffing didn't help.

GEO, AEO, LLMO and AI SEO: are they the same thing?

Mostly, yes. You'll see several names for the same goal of being the source an AI system chooses when it writes an answer:

The labels differ; the work doesn't. In this guide we use GEO.

GEO vs SEO: What's the Difference?

SEO and GEO share most of their foundation. The difference is what you're competing for and where the win shows up.

What GEO and SEO have in common

• Crawlable, indexed pages. Neither works if search engines can't reach your site.
• Helpful, specific content written for real customer questions.
• Trust signals: reviews, links, mentions and a real business behind the website.
• Fast, mobile-friendly pages with clear structure and headings.

Where they differ in practice

• Unit of competition. SEO ranks pages for keywords. GEO decides which businesses get named for a question, so your whole web presence counts, not one page.
• Format. SEO rewards a page that satisfies a search. GEO rewards individual sentences and facts an AI can lift and quote accurately.
• Off-site weight. In SEO, links carry most of the off-site weight. In GEO, reviews, directory listings, forum mentions and press coverage matter more, because AI tools summarize what the web says about you.
• Visibility without a click. An AI answer can name you without anyone visiting your site, so GEO results show up as calls, branded searches and "I asked ChatGPT" leads as much as traffic.

The simplest way to think about it: SEO gets you into the room. GEO gets you picked. A page that ranks on page four is invisible to both Google users and AI tools. A page that ranks well but buries the answer in vague copy may get the click from Google but lose the mention in an AI answer to a competitor who said it more clearly.

Why GEO Matters for Small Businesses Right Now

Your customers have changed how they ask. Instead of typing "dentist Brooklyn," they ask "Who's a good family dentist near Park Slope that takes Delta Dental?" Instead of scanning ten results, they read one answer.

• Fewer clicks reach the old results. In a Pew Research Center study of 68,879 Google searches made by 900 US adults, people clicked a traditional result in 8% of visits when an AI summary appeared, versus 15% when it didn't.
• AI answers are everywhere. Google's AI Overviews appear on a large share of searches; industry trackers put it in the mid-40s percent range in 2025–2026 (Search Engine Journal), and it's higher for question-style searches.
• Buyers ask AI for shortlists. "Best HVAC company near me," "top-rated roofer in Austin," "which Shopify agency should I hire." The AI names two or three businesses, and the rest don't exist for that buyer.
• Google measures it now. In June 2026 Google added generative AI performance reports to Search Console, showing impressions from AI Overviews and AI Mode. When Google starts reporting on something separately, it's worth paying attention to.

For a local business, being one of the two or three names an AI answer mentions is the new top three of the Map Pack.

How AI Assistants Get Their Information: Training Data vs Live Search

AI assistants know about businesses in two different ways, and GEO has to cover both:

For a small business, live search matters most. Questions like "best plumber in Tampa" almost always trigger a web search, because the model can't rely on memory for local, changing information. That's good news: you don't have to wait for the next model to be trained. If your pages and profiles are fixed today, AI tools that search the web can pick them up within days or weeks.

Training data still matters in one way: if the web said something wrong or outdated about you years ago (an old address, a service you dropped), an AI can repeat it. Consistent, current information everywhere is how you correct that over time.

How ChatGPT, Perplexity and Gemini Choose Who to Recommend

All three work in roughly the same way: they turn your question into one or more searches, pull back web pages, choose a handful of sources they trust, then write an answer from them. The differences are in where they search and what they favor.

ChatGPT

When ChatGPT searches the web, it uses third-party search providers (Bing is widely reported as the main one) plus OpenAI's own crawler. According to OpenAI's crawler documentation, sites that opt out of OAI-SearchBot in robots.txt aren't shown in ChatGPT search answers (they can still appear as plain navigational links). OpenAI's separate GPTBot collects training data; blocking it doesn't remove you from ChatGPT search, because the two settings are independent.

• Make sure Bing can index your site: verify it in Bing Webmaster Tools and submit your sitemap.
• Don't block OAI-SearchBot in robots.txt.
• Keep your business details identical everywhere. ChatGPT also draws on what the wider web says about you, including review sites and directories.

Perplexity

Perplexity runs a live web search for most questions and shows numbered citations next to each claim. It uses its own crawler, PerplexityBot, to build its index, and Perplexity's documentation recommends allowing it if you want to appear in results. It tends to favor pages that are relevant, recent and specific, with facts it can attribute.

• Allow PerplexityBot in robots.txt.
• Show a visible "last updated" date and keep key pages current.
• State specific facts (price ranges, timelines, service areas) in plain sentences it can quote.
• Use clear headings that match the questions people ask.

Gemini, Google AI Overviews and AI Mode

Google's AI features are built on Google's own index. Google describes AI Mode's "query fan-out" technique as issuing "multiple related searches concurrently across subtopics and multiple data sources," then bringing the results together into one answer. Google's official guidance says a page must be indexed and eligible to show a snippet to be used as a supporting link, and that there are no additional technical requirements beyond that.

Three Google surfaces are worth separating: AI Overviews are the AI summaries at the top of normal Google results; AI Mode is the separate conversational tab in Google Search; the Gemini app is Google's standalone assistant. AI Overviews and AI Mode are governed by normal Googlebot crawling and Search rules.

• Strong classic SEO is the entry ticket. Pages that don't rank rarely get cited.
• Cover the sub-questions a buyer has (cost, timeline, process, location, comparisons), not just the main keyword, because fan-out searches look for each one.
• Keep your Google Business Profile complete; Google's own business data feeds its local answers.
• For the step-by-step on Google's AI summaries, see our guide on how to get into Google AI Overviews.

Microsoft Copilot, Claude and other AI assistants

Microsoft Copilot answers from Bing's index, so the same Bing Webmaster Tools work that helps ChatGPT helps Copilot too. Anthropic's Claude can search the web and documents its own crawlers, including Claude-SearchBot for search and ClaudeBot for training. Other assistants built into phones, browsers and apps generally license results from Google or Bing. The practical takeaway: if you're solid in Google and Bing and you don't block AI search crawlers, you're covered almost everywhere.

How each platform finds sources

The 4 Signals That Decide Whether You're Mentioned

Across platforms, the businesses that get named consistently share four signals. These are the same four we work on in our AI SEO & GEO services.

1. Entity clarity: AI knows exactly who you are

AI tools need to connect your name to what you do, where you do it and who you serve. If your website says one thing, your Google Business Profile another and an old directory a third, the AI can't be confident, so it names someone else.

• Use the same business name, address, phone and service list on your site, Google Business Profile and directories.
• Add Organization or LocalBusiness schema to your site, with sameAs links to your real profiles.
• Have a real About page that names the people behind the business and their experience.

2. Quotable answers: your pages say it plainly

AI systems quote sentences that answer a question directly. A service page that opens with "We're passionate about excellence" gives them nothing to use. One that opens with "We repair and replace residential HVAC systems across Austin, usually within 24 hours" does.

• Open each key page with a 40–60 word direct answer.
• Add an FAQ built from questions customers actually ask you.
• Use tables for price ranges, timelines and comparisons. The Princeton GEO study found statistics and cited sources made content more visible in AI answers.

3. Third-party proof: others vouch for you

AI tools weigh what the rest of the web says about you, not just what you say about yourself. Reviews, directory listings, local press, industry associations and case studies all count.

• Build a steady flow of genuine Google reviews and reply to them (see our review and reputation management approach).
• Claim the directories that matter in your industry.
• Publish case studies with real numbers, like the ones on our case studies page.

4. Search authority: you already rank

Most AI answers are built from pages that already perform in search. If your site has technical problems, thin pages or no links, fix that first. Our guide on why websites don't show up on Google covers the most common causes, and our SEO services page explains how we fix them.

How AI Chooses Local Businesses for "Near Me" Questions

Local questions ("emergency plumber near me," "dentist open Saturday in Round Rock") are where small businesses win or lose the most. For these, AI tools lean heavily on location and reputation data rather than blog content:

• Your Google Business Profile: categories, services, hours, photos and reviews. Google's AI features draw on Google's own business data, so an incomplete profile is a direct handicap.
• Review volume, recency and wording. Answers often repeat what reviews say ("known for same-day service"). Reviews that mention the service and the neighborhood give AI something specific to repeat.
• Directory and map listings such as Apple Maps, Bing Places, Yelp and industry directories, especially for assistants that don't use Google's data.
• Location pages on your site that state clearly which areas you serve, with real details rather than swapped city names.

In short, local GEO is mostly local SEO done properly, plus making sure the details AI tools repeat about you are accurate.

Technical Checklist: Let AI Crawlers In

Many small business sites block AI tools without knowing it, often through a security plugin, a firewall or a copied robots.txt file. Here's what each major crawler does:

"Your choice" crawlers only affect model training, not whether you're shown in search answers. Sources: Google, OpenAI, Perplexity, Anthropic. A simple robots.txt that keeps every search crawler in looks like this:

CODE BLOCK (USE SANITY'S CODE BLOCK, LANGUAGE: PLAIN TEXT)

User-agent: *

Allow: /

# Optional: opt out of model training only

# User-agent: GPTBot

# Disallow: /

Sitemap: https://www.yourbusiness.com/sitemap.xml

Then work through the rest of the technical basics:

• Check your firewall or CDN. Some bot-protection settings block AI crawlers even when robots.txt allows them. Ask your host or developer to confirm.
• Submit your sitemap in Google Search Console and Bing Webmaster Tools.
• Use IndexNow (many CMS plugins support it) so Bing, and the assistants that use Bing, see new and updated pages quickly.
• Add structured data: Organization or LocalBusiness, Service, FAQPage and Person (for authors) schema help machines read who you are and what you offer.
• Keep key content in HTML. Text hidden behind tabs that load later, inside images or in PDFs is harder for crawlers to read.
• Make pages fast and mobile-friendly. Slow or broken pages get crawled less.

What Content AI Tools Prefer to Quote

AI answers are assembled from small, self-contained pieces. The content formats that get cited most often in our audits share one trait: each section makes sense on its own.

• Direct answers under question headings. An H2 or H3 that asks the question, followed by a 1–3 sentence answer.
• Specific numbers with context. "Most water heater installs take 2–4 hours" beats "we're fast."
• Comparison tables (X vs Y, pricing tiers, option A vs B).
• Step-by-step lists for processes buyers want to understand.
• FAQ sections written from real customer questions, not invented ones.
• Original data and real examples: case studies, before/after results, photos of real work.
• Named experts and dates. A visible author with credentials and a last-updated date signal that the content is maintained.

GEO for Different Industries

The four signals apply everywhere, but what customers ask AI, and what AI looks for, changes by industry:

GEO vs SEO: What Should a Small Business Prioritize?

You rarely have to choose, because most of the work overlaps. But the order matters. Use this to decide where to start:

What GEO Doesn't Replace (and What to Ignore)

GEO is not a separate trick layered on a weak website. Google's own guidance is that existing SEO fundamentals remain worthwhile for its AI features, and no special markup is required. A few myths to skip:

• "You need a special AI file or tag." No major AI search product has confirmed that a dedicated AI file (such as llms.txt) affects which businesses it recommends. Normal crawl access and good pages matter far more.
• "Stuff in more keywords for the AI." In the Princeton GEO tests, keyword stuffing didn't help and in some cases reduced visibility.
• "Mass-produce AI-written pages." Thin, repetitive pages weaken your site's quality signals in Google and give AI tools nothing new to quote.
• "Someone can guarantee you'll be recommended." No one controls what ChatGPT or Gemini says. Anyone promising a guaranteed AI mention is selling something they can't deliver.

The honest limitations of GEO

• Answers vary. The same prompt can name different businesses on different days, or for different users and locations.
• Measurement is partial. Search Console and Bing show AI impressions and citations, but not every assistant reports data, and some AI clicks show up as direct traffic.
• AI can be wrong. Assistants sometimes repeat outdated or incorrect details. You can't edit the answer; you can only fix the sources it draws on.
• It's still moving fast. Platforms change how they search and cite. Anything in this guide that depends on a platform's rules is linked to that platform's own documentation so you can check it.

A 30-Day GEO Starter Plan for Small Businesses

You don't need a big budget to start. One focus per week:

1. Week 1: Baseline. Run the 10-prompt test below on ChatGPT, Perplexity, Gemini and Google AI Mode. Check robots.txt and your firewall aren't blocking Googlebot, Bingbot, OAI-SearchBot or PerplexityBot. Verify your site in Google Search Console and Bing Webmaster Tools.
2. Week 2: Entity clean-up. Make your name, address, phone and services identical everywhere. Complete your Google Business Profile. Add Organization or LocalBusiness schema and a real About section.
3. Week 3: Answer-first pages. Rewrite the opening of your three most important service pages as direct answers. Add an FAQ and one table (pricing ranges, timeline or comparison) to each.
4. Week 4: Proof. Ask your 10 most recent happy customers for a Google review. Claim three relevant directory profiles. Publish one case study with real numbers. Then re-run the prompt test.
   

How to Check If AI Recommends Your Business Today

Open a private browser window (so your history doesn't skew results) and ask each AI tool the questions your customers would ask. Swap in your service, city and business name:

1. "Best [service] in [city]"
2. "Who should I hire for [problem] in [city]?"
3. "[Service] near [neighborhood] open now"
4. "Top-rated [service] in [city] for [specific need]"
5. "[Your business name] reviews"
6. "Is [your business name] good for [need]?"
7. "What does [your business name] charge for [service]?"
8. "[Competitor name] alternatives in [city]"
9. "Which [service] in [city] has the best reviews?"
10. "Recommend a [service] in [city] that [differentiator]"

For each answer, record three things: Were you named? Was your site linked? Was the description accurate? Also note which sources the AI cited, because those are the sites to improve or get listed on. Track the totals monthly. AI answers vary from run to run, so the trend matters more than any single result.

How to Measure GEO Results

Prompt tests show whether you're named. These free tools show whether it's turning into visibility and leads:

• Google Search Console. AI Overviews and AI Mode impressions and clicks are included in the main Performance report. Google's newer generative AI performance report (launched June 2026 and still rolling out to all sites) shows AI impressions by page, country and device.
• Bing Webmaster Tools. Its AI Performance report (public preview since early 2026) shows how often your pages are cited in Copilot and Bing's AI answers, and which grounding queries found them.
• Google Analytics 4. Look for referral traffic from chatgpt.com, perplexity.ai, gemini.google.com and copilot.microsoft.com. ChatGPT adds utm_source=chatgpt.com to many links. Create a custom "AI assistants" channel group so these visits aren't buried in Referral or Unassigned.
• Branded search. Rising searches for your business name in Search Console often follow AI mentions, because people look you up after an AI names you.
• Ask every lead. Add "ChatGPT or another AI tool" as an option in your "How did you hear about us?" field and on intake calls. It's the most direct GEO metric you have.

What We've Seen in Our Own Client Work

Google now treats AI features as part of Search performance. The Search Console reports below are from two of our clients, unedited. Look at the bottom line of each: Google links directly to "performance in generative AI features on Google Search."

Both sites earned this the way GEO is earned: a technically sound site, pages that answer questions directly, and steady authority, so they show up wherever Google and AI tools look for answers.

When we run AI visibility audits for new clients, testing their customers' real questions across ChatGPT, Perplexity, Gemini and Google AI Overviews, the same problems come up again and again:

• The AI uses outdated details: an old address, old hours or a service the business no longer offers, usually traced back to a stale directory listing.
• The AI confuses the business with a similar name in another city, because nothing on the site or profiles makes the location and services unmistakable.
• The AI skips the most profitable service. It knows the business does general dentistry, for example, but never mentions implants, because no page states it clearly.
• A smaller competitor gets named instead. It's rarely about who's better. The competitor's information is simply clearer and easier for the AI to trust.

Every one of these is fixable with the four signals above. See more results on our case studies page.

How Long GEO Takes and What It Costs

Timeline. Technical fixes (crawler access, Bing indexing, schema) can be picked up by AI tools that search the web within days to a few weeks. Entity clean-up and answer-first rewrites usually show in prompt tests within one to two months. Reviews, mentions and rankings build over months. For most small businesses, plan on measuring progress over a 90-day window, against a baseline taken on day one.

Cost. GEO costs depend on how much SEO groundwork your site already has. If your site ranks and your business details are clean, GEO is mostly content and proof work and can run alongside an existing SEO budget. If your site doesn't rank, the SEO foundation comes first, and that's where most of the budget goes. Our guide to how much SEO costs breaks down typical budgets, and you can start for free with the 30-day plan above.

The Bottom Line

AI search hasn't replaced SEO. It has raised the bar for it. The businesses AI tools recommend are the ones that are easy to find, easy to understand and backed by proof from other people. Fix those three things and you'll win both the ranking and the recommendation.