New tracking data confirms that Google AI Overviews now appear on 48% of all search queries — nearly half of every search session. For websites that are not cited in those AI-generated answers, the impact is immediate and severe: click-through rates drop by 61% compared to the same SERP without an AI Overview present. The compounding effect is what makes this number alarming: as AI Overview coverage expands from 48% toward a majority of searches, the CTR penalty for non-cited sites applies to an ever-larger share of queries.

The data reframes the GEO stakes entirely. Before AI Overviews reached scale, organic rankings still drove meaningful traffic even when an AI summary appeared. At 48% coverage and a 61% CTR penalty for the uncited, traditional top-10 rankings are delivering materially less traffic than they did 18 months ago — and that gap is structural, not temporary. Brands without a citation strategy are not "missing out on upside"; they are experiencing a compounding traffic loss that widens every quarter.

Gigawatt Group's 2026 GEO report tracked 1,094 ChatGPT topic categories and found that only 15.2% had a durable, consistently-cited brand leader. The other 84.8% are open territory — no brand has established reliable citation presence. At the same time, total AI platform traffic reached 9.5 billion monthly visits, up 70% year-over-year, meaning audience scale in AI-mediated channels is no longer theoretical. These two data points together define the opportunity: massive audience, almost no competition at the brand-ownership layer.

"The 48% AI Overviews figure is the one that should end the 'wait and see' conversations. We crossed the point where AI Overviews are an edge case — half of all searches now serve one, and uncited brands lose 61% of the clicks they would have otherwise captured. Combined with the Gigawatt finding that 84.8% of topic categories still have no dominant brand citation — this is the clearest window I've seen to establish a GEO position before the category fills. The brands moving now aren't early adopters taking a risk; they're the ones locking in the territory while everyone else is still debating whether GEO is real."