What is the difference between GEO and SEO?

SEO ranks pages in a list of blue links; GEO maximises the probability of being cited as a source inside an AI-synthesised answer. They share signals (Schema.org, hreflang, content quality) but optimise different surfaces. A site can excel at SEO and be invisible to LLMs, and the reverse.

What is the difference between GEO and SEO, in practice?

An index engine (Google, Bing) returns a ranked list. The user picks. An answer engine (ChatGPT, Claude, Perplexity, Gemini, Copilot) synthesises a response and cites between one and six sources. The user reads. The conversion is no longer a click but a citation. That single shift produces a cascade of technical and editorial consequences, ten worth naming.

Ten technical fault lines

1. Unit of output, SEO: page rank. GEO: citation share in a synthesised answer.
2. Central metric, SEO: position, CTR, sessions. GEO: citation rate (% of relevant queries citing the brand).
3. Indexing layer, SEO: Google + Bing crawler. GEO: 24+ AI user-agents (GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Applebot, etc.).
4. Authority signal, SEO: backlinks + EEAT. GEO: Schema.org Author Person + Wikidata sameAs + indexed press.
5. Native format, SEO: HTML + meta. GEO: HTML + JSON-LD + llms.txt + llms-full.txt.
6. Language strategy, SEO: hreflang to avoid duplicate content. GEO: hreflang as a cross-language coherence signal that adds confidence.
7. Content density, SEO: long-form, keyword density. GEO: structured Q/A blocks, self-contained 2-4 sentence answers at the top of each page, sourced facts in the body.
8. Source verification, SEO: implicit (Google ranks trusted sites higher). GEO: explicit (LLMs cross-check sources, penalise contradictions).
9. Time horizon, SEO: 3-6 months to first lift. GEO: 6-12 weeks for retrieval surfaces, 6-12 months for training-data inclusion. First-mover window: 18-36 months.
10. Measurement, SEO: Google Search Console + analytics. GEO: versioned 200-prompt panel + Bing Webmaster AI Performance Report + Cloudflare AI Crawl Control telemetry.

What stays in common

Site speed (Core Web Vitals), HTTPS, mobile-first design, clear information architecture, sitemap.xml, hreflang reciprocity, all remain table-stakes for GEO too. The notion that "SEO is dead" oversimplifies: GEO is an additive layer on top of a solid SEO foundation. A site with broken canonicals or 404s will never be GEO-ready. PROEMA always audits SEO hygiene before deploying GEO-specific work. Sources: developers.google.com/search/docs, OpenAI / Anthropic / Google bot documentation, Princeton GEO paper arXiv:2311.09735.

Counterintuitive finding. According to BrightEdge's March 2026 "AI Overviews and Search" report, Google AI Overviews now display an average of 3.4 cited sources per answer versus 1.8 in September 2025, and 47% of Overviews cite at least one source that does not appear in the classic SEO top 10. The LLM indexing layer has become decoupled from Google's organic ranking.