GEO and AEO in 2026: the complete guide to being cited by ChatGPT, Perplexity and Gemini
Generative engines (ChatGPT, Perplexity, Gemini, Claude) are redefining search. Here's how to adapt your content to be cited by AIs — without losing Google SEO.
TL;DR — GEO (Generative Engine Optimization) and AEO (Answer Engine Optimization) structure a site so it can be read, summarized and cited by generative AIs (ChatGPT Search, Perplexity, Gemini, Claude, AI Overviews). 7 pillars: direct answers at the top, H2/H3/list structure, full schema.org, llms.txt, allowing AI crawlers, visible sources and dates, topical authority.
In 2026, 20 to 40 % of "search" traffic on a B2B site comes from a generative engine. This shift forces publishers to adapt — enter GEO and AEO.
What are GEO and AEO?
- GEO: optimize to be cited by a generative engine.
- AEO: optimize to be shown as the direct answer (answer box, AI Overview, snippet).
The 7 pillars in 2026
1. Direct answer at the top
2 – 4 line TL;DR, one-sentence definition, bulleted summary.
2. H2/H3 structure and lists
Single H1, H2 per major topic, H3 per subtopic (FAQ), lists and tables.
3. Full schema.org
Article, FAQPage, HowTo, BreadcrumbList, Organization, Person.
4. The /llms.txt file
Describes the site to LLMs. Minimal example:
# Site name
> One-sentence description.
## Sections
- [Home](/)
- [Guide](/blog/geo-aeo)
5. Allow AI crawlers in robots.txt
OAI-SearchBot, GPTBot, PerplexityBot, Google-Extended, ClaudeBot, Applebot-Extended.
6. Visible sources and dates
Publish AND updated date, author with bio link, external sources cited.
7. Topical authority
One niche, 5 – 10 subtopics, 20 – 50 interlinked articles.
What does NOT work
- Keyword stuffing.
- AI-generated content without human review.
- Articles < 500 words.
- Content-blocking popups.
- Hard paywalls.
How to measure
- Monthly manual test in ChatGPT / Perplexity.
- Referrer traffic from chatgpt.com, perplexity.ai, gemini.google.com.
- AI Overviews impressions in Search Console.
FAQ
Does GEO replace SEO?
No, it extends it.
Should I block GPTBot?
Strategic choice. OAI-SearchBot (ChatGPT Search) should almost always be allowed.
Is llms.txt an official standard?
Not IETF yet, but adopted by major AI crawlers.
Do I need a TL;DR on every article?
Yes for content > 1 000 words.
How do I measure a ChatGPT citation?
Manual test + GA4 referrer traffic.
Is Google SEO still useful?
Absolutely. Both compound.
Getting started
Three immediate actions: TL;DR on your 5 top articles, publish /llms.txt, verify robots.txt. Measurable effect within 60 days.