AI Search
Generative Engine Optimization: What It Is and Whether You Should Care
GEO has become an industry buzzword. Here's what Google, Microsoft and OpenAI actually say in 2026, and what changes for ecommerce.
GEO in one sentence
Generative Engine Optimization (GEO) is the practice of getting your content cited as a source by AI answer engines: Google AI Overviews, ChatGPT Search, Perplexity, Gemini, Microsoft Copilot.
It does not replace SEO. Google publicly stated in May 2026 that GEO and SEO are the same craft, with no separate playbook. Microsoft published guidance in October 2025 that is more granular but still leans on classic SEO fundamentals.
Who says what (May 2026 snapshot)
Google: 'There is no special markup, no AI-specific schema, no llms.txt required. Do SEO well, with strong E-E-A-T, and AI Overviews will pick you up.'
Microsoft (Bing/Copilot): more prescriptive. Suggests one-to-two sentence direct answers, named author bios, classic schema, no caching critical content in tabs or PDFs.
OpenAI (ChatGPT Search): crawl-driven, citations weighted by source authority and content freshness. No published technical guidance.
The llms.txt debate (settled)
Search Engine Land's January 2026 study of 10 sites using llms.txt: zero measurable traffic gain from AI engines. John Mueller (Google) confirmed publicly that no LLM in production parses llms.txt.
Verdict: do not waste time. Only experiment with it if your audience is dev/API focused and you want a clean machine-readable index for your own tooling.
What actually moves citation rate
1. Topical authority: clusters of 20+ deeply linked articles on a single topic outperform isolated pages 4x.
2. Experience signals: named authors with bio, real-world examples, photos of work being done.
3. Extractability: clear H2 questions, declarative answers, no fluff before the answer.
4. Freshness: documented update dates, recent references, removal of stale claims.
5. External mentions: real PR and product-driven mentions on high-trust domains.
Measuring GEO without obsessing
There is no Search Console for AI citations yet. Build a manual tracker: 20 priority queries, queried weekly in Google AI Mode, ChatGPT Search, Perplexity. Log citations.
Track citation rate, not citation rank. The signal is binary: cited or not. After 90 days, you have a real baseline.
Should ecommerce brands care?
Yes, but not as a separate budget line. Treat it as a quality tier on top of your existing SEO program. The brands that win in AI search in 2026 are the brands that already win in classic SEO with deeper expertise signals.
If you have a 4 out of 10 SEO baseline, fix that first. GEO won't compensate for thin content, broken indexing, or a 4-second LCP.