AI Overviews at 47% of SERPs: what it changes for classic SEO
AI Overviews moved from 13% to 47% of Google SERPs in 18 months. This structural shift redefines what SEO means in 2026.
1. The numeric trajectory
Launched in May 2024 as Search Generative Experience, AI Overviews became in under two years the dominant SERP format on informational queries. The move from 13% to 47% of treated queries is confirmed by BrightEdge Q1 2026 data and reproduced by Proema Insight internal measures on a 1,000-query French-speaking panel.
The trajectory follows a classic S-curve: slow adoption over six months, 2025 pivot acceleration, partial 2026 H1 plateau. The next expected step, around 60-65%, should hit mid-2027 per Gartner Marketing Hype Cycle 2026 projections.
2. What it changes for classic SEO
Organic clicks on positions 1 to 3 drop measurably. Authoritas March 2026 study documents an 18 to 32% average organic CTR drop on informational queries that trigger an AIO. On transactional queries impact is smaller (5 to 12%) because Google strips or weakens the AIO there.
The stake is no longer ranking first on Google, it is being cited inside the AIO. And AIO citation mechanics follow logic close to Perplexity: source authority, freshness, parsing structure, dense Schema.org.
3. Content that survives
On the Proema Insight 1,000-query sample three content families keep their traffic even under live AIO: fine comparison content (versus, ranking, top X 2026), transactional content (reviews, prices, where to buy), pointed expertise content with identified author (Person Schema + Wikidata).
These three families share an attribute: they answer questions Google users do not settle for the AIO to resolve. Useful SEO in 2026 concentrates on those pockets.
| Format | Organic CTR pre-AIO | Organic CTR with AIO | Survival |
|---|---|---|---|
| Short definition | 15% | 3 to 5% | Low, AIO suffices |
| HowTo tutorial | 22% | 8 to 12% | Medium, AIO incomplete |
| X vs Y comparison | 28% | 20 to 24% | Strong, decision intent |
| Verified review | 35% | 30 to 33% | Strong, transactional intent |
| Author expertise | 18% | 14 to 17% | Strong, authority preserved |
4. How to steer in 2026
The 2026 PROEMA doctrine splits two objectives per page. First: be cited in the Google AIO. Second: catch the surviving click post-AIO. Levers overlap partially but are not identical.
For objective one, dense Article or FAQPage Schema, fresh dateModified, 40 to 80 word paragraphs with named source. For objective two, comparative or transactional format, identified author, visible above-the-fold CTA.
5. Measuring AIO impact on a domain
Search Console now exposes Performance > AI Overviews data separately. Crossed with Gemini citation tracking (which shares the AIO index) it isolates pages effectively cited in the AIO from absent ones.
Proema Insight standard publishes a monthly two-block report: AIO citation rate on the domain top 30 queries, and pre/post-AIO organic CTR delta on the same queries.
AI Overviews is not the end of SEO. It is the birth of a more demanding discipline where citation outranks ranking.
source: PROEMA method 2026 · AIO chapter
The PROEMA GEO diagnostic measures AIO presence rate for a domain on 30 priority queries. Gap reading in under ten minutes.