Andreessen Horowitz has published an article titled "How Generative Engine Optimization (GEO) Rewrites the Rules of Search," signaling that the venture firm sees the shift from classic search rankings to AI-generated answers as a structural change for anyone who depends on search traffic.

That is the extent of the verifiable information available to Mart Signal at press time. The distribution feed carried only the headline and the publisher's name. The full text sits on the Andreessen Horowitz site, and we will not paraphrase arguments we have not read.

Why does a single headline warrant a news item? Because of who published it. When a16z puts its name on a topic, founders, ad-tech vendors, and publishers treat it as a market signal. GEO — the practice of optimizing content to appear inside AI-generated answers rather than traditional blue-link results — has spent two years as a conference talking point. Coverage from a top-tier investor moves it closer to a budget line.

What can readers confirm right now? Three things:

• Andreessen Horowitz is the publisher.
• The article's stated thesis is that GEO "rewrites the rules of search."
• The framing treats generative engines as a new distribution channel that changes optimization practice, not an incremental tweak to SEO.

Mart Signal has not independently verified the article's claims, data, or recommendations, and the feed did not include author names, figures, or quoted statements.

Our standard editorial rule applies: we report what shipped, what it does, and what it costs. In this case, what shipped is a publication, not a product. We will update this story once we can attribute specific arguments, statistics, and quotes from the original text — or when a16z follows the essay with disclosed investments in the GEO tooling space, which is the usual next beat in this sequence.

Until then, treat this as a flag, not a verdict.