13 min read
GEO: What the Research Says About AI Search
What academic studies, practitioner data, and platform research say about AI citations — updated with the August 2026 ChatGPT retrieval shift.
Read MoreAi Search
55 articles
8 min read
Is ChatGPT Sending You Traffic? Check GA4.
Where ChatGPT, Perplexity, and Gemini traffic shows up in GA4, how to read it, and how GSC's new Generative AI report completes the picture.
Read More11 min read
AI Citation Research: What the Papers Say
Most GEO advice cites no sources. Coppersun.io's Research Center collects four real papers on AI citation. Here is what each one found.
Read More10 min read
SEO vs GEO: What Changes When AI Reads Your Site
Coppersun.io argues SEO and GEO split on a list versus a synthesized answer. Read against Brass-SEO's own GEO framework, here's what holds up.
Read More10 min read
How AI Ranks Content Formats Before Quoting You
Coppersun.io ranked six content formats by AI citability. See what it found, how it matches Brass-SEO's own capsule rule, and a before/after to copy today.
Read More10 min read
Why AI Recommends Some Brands and Ignores Others
Copper Sun's sister site studied why AI names one brand and skips another. Here's what it found, and how the Brass-SEO AI Citability audit checks for it.
Read More6 min read
AI Overviews Cut Clicks in Half: The Pew Data
Pew tracked 69,000 real Google searches: users click a result 8% of the time when an AI Overview appears, versus 15% without. What the independent data says vs. Google.
Read More6 min read
Block the Training Bot, Keep the Answer Bot
Most sites that try to block AI accidentally block the crawlers that get them cited in ChatGPT and Claude. The robots.txt difference that matters.
Read More10 min read
Boundary Content: A First-Party GEO Case Study
AI engines cite the page they can quote without being wrong. Our boundary-content GEO play on sibling product BrassCoders — and what we skipped.
Read More7 min read
What AI Search Won't Cite (and Why It Skips You)
AI engines skip pages not because they rank badly, but because they can't quote them without being wrong. The citation-safety rule, and the one SEO problem Brass-SEO can't fix.
Read More7 min read
AI Mode Is Default Now. Read Your GSC Differently.
Google made AI Mode the default in May 2026. Here's why your clicks dropped while impressions held, and how to read your GSC data now.
Read More6 min read
Cited in AI Overviews but Not AI Mode? They Differ.
Only about 14% of AI Mode citations overlap with AI Overview citations. They're two separate targets. Here's why, and how to win both.
Read More7 min read
AI Shopping Agents Pick Products. Help Yours Win.
58% of shoppers now use AI for product recommendations. Here's how an AI agent decides what to suggest, and how to make sure your products qualify.
Read More6 min read
What Gets You Cited by AI: The Numbers (2026)
Quotations lift AI citation 41%, statistics 32%, sources 30%, fluency 28%. The four levers that move the needle, with the research and the fix for each.
Read More13 min read
How AI Shopping Agents Find Products
How AI shopping assistants source product info in 2026, what makes a product page extractable by an AI agent, and a checklist to get your products surfaced.
Read More11 min read
Do Featured Snippets Still Matter in 2026?
Featured Snippets still appear for many queries, and the content that wins them is the same content AI search cites. Here is how to win one.
Read More8 min read
Why Standard JSON-LD Alone Doesn't Improve AI Citations
Adding schema markup is not enough. Research finds standard JSON-LD alone didn't produce AI retrieval gains. What does? Dereferenceable entity pages — and here's what that means.
Read More6 min read
Introducing the Brass-SEO Research Index
A curated index of primary literature on SEO and GEO — peer-reviewed papers, IETF standards, and independent benchmarks. No vendor white papers.
Read More8 min read
Entity SEO and the Knowledge Graph: What Wikidata Does
Google's Knowledge Graph launched with 'things, not strings' as its philosophy. Wikidata is a primary source. Here's what entity SEO looks like from the primary literature.
Read More11 min read
Guerilla SEO in 2027: The AI-Native Playbook
Five directional predictions for guerilla SEO in 2027. What changes when most search becomes AI-mediated. Where to place your bets now.
Read More12 min read
8 SEO Publications on Google Preferred Sources
How eight SEO and tech publications covered Google's May 27, 2026 Preferred Sources expansion into AI Mode. The takes, the gaps, and Brass-SEO's response.
Read More11 min read
Google Preferred Sources: How to Add the Button
Google now lets users pick Preferred Sources for AI Mode and AI Overviews. Here's the deeplink URL, the official badges, and how publishers add it.
Read More10 min read
Google's Highly Cited Label: How to Earn One
Google's new Highly Cited label highlights articles other publishers reference most. How Google calculates it, what earns one, and the limits of the tactic.
Read More11 min read
Is Preferred Sources Worth It for Local Sites?
Google Preferred Sources is built for publishers. Here's the honest answer on whether local service businesses, restaurants, and retailers should add it.
Read More10 min read
How to Track Preferred Sources Conversions in GA4
Google's Preferred Sources has no Search Console report yet. Here's the GA4 setup that captures button clicks, CTR shifts, and the 90-day measurement frame.
Read More10 min read
Where to Put the Preferred Sources Button
Three button placements that convert and two that don't. Plus the copy and A/B test methodology for getting more readers to add you as a Preferred Source.
Read More11 min read
Will Preferred Sources Move the Needle? A Test Plan
Most coverage assumes Google Preferred Sources is a big win. Here's the 30-day test plan that tells you whether it's actually working on your site.
Read More9 min read
Why Your Page Was in AI Mode and Then Wasn't
AI Mode citations are volatile. Pages cited last week may vanish this week with no Google update. Here's why it happens and how to stabilize visibility.
Read More9 min read
AI Mode vs Traditional Search: A 2026 Breakdown
How AI Mode and traditional Google search differ in 2026: what each surface shows, who clicks through, and how to optimize for both at once.
Read More10 min read
Google AI Mode: What It Is and How to Optimize
Google AI Mode is a conversational search experience rolling out in 2026. What it shows, who sees it, and how to make sure your pages are in the citation set.
Read More9 min read
Tracking AI Mode Traffic in GA4: A Setup Guide
How to identify Google AI Mode and AI Overview traffic in GA4 using referrer filters, custom dimensions, and exploration reports. A step-by-step setup.
Read More9 min read
How to Test Your Brand's AI Search Visibility
A step-by-step method for testing whether ChatGPT, Perplexity, Gemini, and Claude cite your brand. Run it quarterly to track visibility over time.
Read More12 min read
Why ChatGPT Cites Some Pages and Skips Others
Two pages on the same topic, similar word count, similar Google rankings. ChatGPT cites one and ignores the other. Here's what the research says about why.
Read More14 min read
AI Overviews vs Featured Snippets: What Changed
AI Overviews are multi-source AI syntheses. Featured Snippets are single-source extracts. Both still exist — here is what changed and how to win each.
Read More12 min read
Original Data SEO: Real Results from a Case Study
We published two data-driven posts from real production records. Here's the methodology, what the data showed, and why no competitor can replicate it.
Read More9 min read
Content Length and AI Citations: What Data Shows
Does longer content get cited more by AI systems? What the research says about word count, structure, and how AI chooses what to quote.
Read More12 min read
Why Expert Quotes Boost AI Citations by 41%
Princeton's GEO research found expert quotes drove the largest single-factor citation lift. What counts as an expert quote, what doesn't, and how to add them to your content.
Read More11 min read
GA4 vs Server Logs: Tracking AI Traffic Honestly
Why GA4 underreports AI traffic, what server logs catch that GA4 misses, and how to use both to understand real AI activity on your site.
Read More10 min read
llms.txt: A Practical Guide for AI Crawlers
What llms.txt is, how to write one for your site, what evidence exists for whether it works, and where it fits in your AI search strategy.
Read More9 min read
Schema Markup and AI Search: What Research Shows
What published research says about whether schema markup helps AI systems like ChatGPT and Perplexity cite your content.
Read More9 min read
7 GEO Myths That Waste Your Time
Seven common misconceptions about Generative Engine Optimization, debunked with research from Princeton, practitioner studies, and platform data.
Read More13 min read
How Brass-SEO Automates Your GEO Strategy
A five-step GEO workflow using Brass-SEO: identify target pages, audit citability, check AI referral traffic, make fixes, and re-audit.
Read More13 min read
GEO FAQ: 25 Questions About AI Search
Twenty-five answers to the most common questions about Generative Engine Optimization, from what GEO is to how to measure it.
Read More14 min read
Part 4: Page 1 on Google, Zero AI Citations
A page ranking #5 on Google got zero AI referral traffic. We ran an AI citability audit, made four changes in 30 minutes, and documented every step.
Read More15 min read
Part 3: How to Audit Any Page for AI Citability
Part 3 of our LLM Visibility series. Evaluate whether your page is structured for AI citation by ChatGPT and Perplexity, and what to fix first.
Read More14 min read
GEO Case Study: 8 Fixes in 10 Minutes
We ran two Brass-SEO reports on a page ranking #8 with zero clicks. Every fix we made, why it matters for AI citability, and how the tool found it.
Read More11 min read
Part 2: How to Track Whether AI Is Citing You
You optimized your content for LLMs. Now how do you know if it worked? The tracking methods that exist today and what they can and cannot tell you.
Read More10 min read
Part 1: Answer Capsules: The Content Trait LLMs Cite Most
New research shows 72.4% of blog posts cited by ChatGPT share one structural trait. Here is what it is, why it works, and how to add it to your content.
Read More9 min read
Brand Mentions Matter More Than Backlinks
Backlinks used to be the only off-site SEO factor. Now Google and AI systems also track how often people mention your brand, even without a link.
Read More9 min read
Is Your AI Content Helping or Hurting SEO?
Google doesn't penalize AI content for being AI-written. It penalizes low-quality content regardless of how it was made. Is yours helping or hurting?
Read More8 min read
Reddit Keeps Showing Up in Google
Reddit results now appear in Google for almost every search. Why this is happening, what it means for your business, and whether you should be on Reddit.
Read More9 min read
How to Get Cited by ChatGPT and Perplexity
AI tools cite websites when answering questions. Getting cited means free traffic from a growing channel. What makes them choose your site over others.
Read More8 min read
Where People Search Besides Google in 2026
Google is still dominant, but it's no longer the only place people search. Where your customers look for answers and what it means for your business.
Read More10 min read
What AI Overviews Mean for Your Website
Google now shows AI-generated answers at the top of many searches. What AI Overviews are, how they affect your traffic, and what to do about it.
Read More9 min read
Zero-Click Searches Explained
Over half of Google searches end without a click to any website. What zero-click searches are, which ones affect your business, and what to do about them.
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