LLM SEO — get visible in language models

What LLM SEO is — the definition

An LLM (large language model) is the technology behind ChatGPT, Claude, Gemini and Perplexity. LLM SEO is the work of making your business visible, understood correctly and cited by these models — so you are among the names a language model mentions when a customer asks it for advice.

The shift is fast: where a customer used to google and click a list, more and more now ask a language model directly and get a single answer with a few recommended names. If you are not among them, you lose a lead you never saw.

The precise term for the discipline is GEO. "LLM SEO" and AI SEO are the intuitive labels for the same work.

How a language model sees your business

To work with LLM SEO you need to understand the two ways a language model knows your business — each takes a different effort:

• 1. Training data (the built-in knowledge). The model is trained on a large body of web text up to a cut-off date. If your business is mentioned consistently across the web — same name, same category, same facts — the model is more likely to "know" you from the inside. This rewards a strong, unambiguous brand entity and broad, consistent mentions.
• 2. Live retrieval (browsing). ChatGPT search and Perplexity pull in live pages while answering and cite them with a source. Here everything is decided by whether your page can be fetched and extracted right now: that AI crawlers have access, that the content is readable without JavaScript, well-structured and citable — and that an llms.txt gives the model a curated overview.

Most businesses are not visible either way yet. The good news: the second route — live retrieval — you can influence directly and quickly. That is where LLM SEO really moves the needle.

LLM SEO, AI SEO and GEO — how they connect

The three terms describe the same shift from different angles — they are not competing disciplines:

In short: whatever you call it, the work is the same — and the signals that work for one strengthen the others. See the broad picture in the AI SEO guide and the discipline in the GEO guide.

What LLM SEO asks of your content

Language models reward content that is easy to understand, extract and trust. The most important signals:

• Build an unambiguous brand entity. The same name, category and facts everywhere (website, registries, directories) make it easy for the model to understand — and remember — who you are.
• Make sure AI can read the page. If your page needs JavaScript to show content, AI crawlers see an empty shell — check it with the AI Readability Check.
• Be citable. Concrete numbers, dates and sources make your content safe to cite; vague superlatives get skipped.
• Answer one question directly and early. Put the short, concrete answer in the first couple of sentences — that is the block the model lifts out.
• Add structured data (schema). FAQPage, Organization and HowTo make the answer machine-readable.
• Publish an llms.txt. The file gives the model a curated overview of your business — create one for free with the llms.txt generator.

These are the same signals the GEO test measures — so your LLM SEO effort is one combined effort.

Getting started with LLM SEO

1. Measure your starting point. Run the free GEO test (60 seconds, no login) and see which signals keep you out of the language models' answers.
2. Make sure AI can read your page. Check robots.txt and JavaScript dependence with the AI Readability Check.
3. Strengthen your brand entity. Align your name, category and core facts across your website, registries and directories.
4. Make the content citable, and add an llms.txt. Use the llms.txt generator and add FAQPage schema.
5. Measure again, and repeat. Visibility in language models is built over time — track your GEO Score and fix what drags it down.

If you want it done automatically, the Geoa platform measures and fixes these signals for you via the WordPress or Shopify integration — from DKK 299/month with a 14-day free trial, no card required. See the full picture in the complete GEO guide.

Frequently asked questions about LLM SEO

Is LLM SEO the same as GEO?

Yes, in practice. GEO (Generative Engine Optimization) is the precise term for the discipline; "LLM SEO" is the intuitive label many people use because the search now happens inside large language models. It is closely related to AI SEO.

What is an LLM, exactly?

An LLM (large language model) is the technology behind ChatGPT, Claude, Gemini and Perplexity. It is trained on a large amount of text and can answer questions in prose — increasingly with cited sources.

How does a language model find my business?

Two ways. First, training data: if your business is mentioned consistently across the web, the model may "know" you from the inside. Second, live retrieval: ChatGPT search and Perplexity fetch live pages while answering and cite them — so a crawlable, citable site and an llms.txt matter.

Can I measure my LLM visibility for free?

Yes. Run the free GEO test (60 seconds, no login). It scores the technical signals that decide whether a language model can find, understand and cite you.

Which language models are we talking about?

The main ones are ChatGPT, Claude, Gemini and Perplexity. The work is largely the same across them: build a clear brand entity and make your content easy to read, extract and cite.