The short answer
SEO and GEO are two distinct disciplines targeting two separate discovery channels. SEO optimises websites for Google's link-based ranking algorithm. GEO optimises business entities for the knowledge graphs, citation signals, and authority structures that large language models use to decide who to recommend. A business can rank first on Google and be completely invisible to ChatGPT.
As of April 2026, AI Overviews appear on 48% of all Google queries. ChatGPT processes over two billion queries daily. Businesses without a GEO programme are invisible on a channel that now reaches more people than the first page of Google results.
What SEO does
Traditional SEO optimises for Google's PageRank algorithm — a system that ranks websites based on backlinks, keyword relevance, and on-page signals. The output is a ranked list of links. The success metric is ranking position. The channel is Google search.
SEO works by making websites more legible to Google's crawlers. Backlinks signal authority. Keywords signal relevance. Technical SEO signals crawlability. These inputs feed a ranking algorithm that returns an ordered list of web pages.
What GEO does
Generative Engine Optimisation optimises for how AI models build entity models of businesses. Large language models do not crawl links — they build knowledge graphs from Wikidata entries, Wikipedia articles, LinkedIn profiles, Reddit discussions, review platforms, and editorial publications. The output is a cited recommendation. The success metric is Share of Model Score.
GEO works by making a business entity verifiable and authoritative across the third-party sources that AI tools trust. 85% of AI brand citations come from third-party sources, not brand websites (Semrush, January 2026). Reddit, LinkedIn, and Wikipedia account for over 30% of all LLM citations combined.
The four key differences
| SEO | GEO | |
|---|---|---|
| Target | Google's ranking algorithm | LLM knowledge graphs |
| Input signals | Backlinks and keywords | Entity signals and third-party mentions |
| Output | Ranked link on Google | Named citation in AI answer |
| Measurement | Ranking position | Share of Model Score |
| Timeline | 3-6 months | 30-150 days |
Do you need both?
Yes. SEO and GEO are complementary, not competing. Google still processes approximately 8.5 billion searches per day. AI Overviews now appear on 48% of those queries (Averi, April 2026). A business that ranks well on Google but has no GEO programme is visible on the traditional channel and invisible on the AI channel.
The businesses winning discovery in 2026 are optimising for both. The ones falling behind are treating GEO as optional. It is not. For a realistic view of what to expect at each stage, see our guide on how long GEO results take.
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