GSC's Gen AI Performance Report lets you view impression counts for AI Overviews and AI Mode by page, country, device, and date (introduced by Google Search Central on June 3, 2026). However, clicks, CTR, and traffic impact cannot be measured at this time — only impressions are supported. As of June 2026, no tool can fully capture the 'effect' of AI search on your site.
What the Gen AI Performance Report Actually Is: What Google Officially States
On June 3, 2026, Google Search Central announced the addition of Gen AI Performance Reports to Google Search Console, beginning a staged rollout from the UK.
What the official documentation explicitly states
- Impression counts for AI Overviews are available
- Impression counts for AI Mode are available
- Data can be filtered by page, country, device, and date
- Clicks, CTR, and traffic impact are not supported at this time — impressions only
Source: developers.google.com/search/blog/2026/06/gen-ai-performance-reports
You may see headlines claiming you can now 'measure the effect of AI Overviews' — but precisely: you can see how many times AI Overviews appeared (impressions). Whether those impressions led to more clicks cannot be determined from this report alone. This distinction matters in practice.
AI Overview vs. AI Mode: Reading the Google I/O 2026 Numbers Accurately
At Google I/O 2026 (May 19–20, 2026), CEO Sundar Pichai disclosed specific numbers for AI Overviews and AI Mode. These are two distinct features. Claims that they have been 'merged' or 'integrated' have no basis in primary sources.
| Feature | Description | Monthly Users (Google I/O 2026) |
|---|---|---|
| AI Overview | AI-generated summary shown automatically at the top of regular search results | 2.5 billion |
| AI Mode | AI-centric search experience that users explicitly opt into | 1 billion |
Source: blog.google/innovation-and-ai/sundar-pichai-io-2026/
The Gen AI Performance Report lets you view AI Overview and AI Mode data through separate filters. This makes it possible to see which AI feature is generating more impressions for your pages.
How to Use the Report: What to Actually Check in Search Console
Here's what to prioritize when you actually open the Gen AI Performance Report — starting from the premise that only impressions are available.
Which pages appear in AI Overviews (impressions by page)
Sorting by impressions at the page level reveals which pages appear in AI Overviews. Pages with more impressions are referenced more often by Google's AI. Query-level data is not yet available, but cross-referencing with the standard GSC Performance report can hint at which query contexts trigger AI Overviews.
Impression trend over time (before vs. after changes)
The date axis lets you check whether AI Overview impressions increased after a change like a rewrite or adding structured data. But more impressions do not directly mean more clicks. Treat this as a reference signal for whether a change affected AI citation frequency.
Identifying patterns by country and device
AI Overview and AI Mode rollout status differs by country, with English-speaking markets leading. Use the country filter to distinguish Japanese-market impressions from English-speaking ones. A high smartphone share suggests prioritizing mobile content optimization.
Why Clicks Can't Be Measured: The Structural Problem of AI Search Measurement
Click behavior when an AI Overview appears differs structurally from regular organic search. Here's why measurement is difficult.
Structural measurement problems
- •Clicks from citation links inside AI Overviews are counted in GSC as regular Google organic clicks — not separately
- •Cases where users read an AI Overview and are satisfied without visiting the site (zero-click) are invisible in measurement
- •AI Mode responses sometimes resolve entirely in the browser, creating attributed-but-untracked traffic invisible to GA and GSC
According to Pew Research (published July 2025, survey conducted March 2025), AI summaries appeared in about 18% of Google searches. The organic click rate was 8% when an AI summary appeared versus 15% when it did not. Clicks on citation links inside AI Overviews were just 1%.
Pew Research (July 2025): Key Figures
- •AI summary display rate: ~18% of Google searches
- •Organic click rate (AI summary present): 8%
- •Organic click rate (no AI summary): 15%
- •Click rate on citation links inside AI Overview: 1%
⚠️ Google has disputed this study's methodology (correlation, not causation). Source: pewresearch.org/short-reads/2025/07/22/…
These figures suggest clicks are less likely when an AI Overview appears. While Google disputes causation, this is a measurement design challenge practitioners need to be aware of. The new GSC report supporting only impressions likely reflects the technical difficulty of isolating AI-driven clicks.
Our Own GSC Data: AI Measurement Query Demand Exists, But Tooling Is Immature
We reviewed GSC data from our own SEO tool site (JA, trailing 28 days) for AI search measurement queries. The following is a summary of observations (actual figures; site names anonymized).
Observation data (JA, trailing 28 days)
| Query | Impressions | Avg. Position |
|---|---|---|
| ai overview 計測 | 133 | 37位 |
| ai回答引用 モニタリングツール | 109 | 45位 |
| ai回答 引用 モニタリング | 87 | 44位 |
| ai overview 対策 | 61 | 66位 |
| ai overview 対策チェックリスト | 24 | 39位 |
All these queries generate dozens to over a hundred impressions, but average positions range from 30 to 66 — none reach page one. This shows that AI search measurement needs clearly exist, while adequate content supply in the search market is lacking.
Practical implications of this observation
'ai overview measurement' and 'ai answer citation monitoring' represent new demand emerging as AI search adoption grows. The Gen AI Performance Report can confirm impressions but cannot track clicks or traffic. Demand exists, but tooling is immature — this structural gap is the accurate picture of AI search measurement as of June 2026.
FAQ Rich Results Deprecation and the Gen AI Report: Two Changes Often Confused
May and June 2026 brought two important changes from Google. The deprecation of FAQ rich results (May 7) and the addition of the Gen AI Performance Report (June 3) are separate events. Confusing them leads to incorrect practical responses.
| Change | Date | Impact |
|---|---|---|
| FAQ rich results deprecated | May 7, 2026 (API ends August 2026) | FAQ accordion in search results disappears. FAQPage rich results are gone |
| Gen AI Performance Report added | June 3, 2026 (staged rollout) | AI Overview and AI Mode impressions become visible in GSC |
FAQ deprecation source: developers.google.com/search/docs/appearance/structured-data/faqpage
The deprecation of FAQ rich result display does not mean structured data implementation should stop. Whether JSON-LD (Article, FAQPage, etc.) helps Google's AI understanding is separate from rich result display, and has not been officially addressed. 'FAQ rich results are gone, so JSON-LD is unnecessary' is a misreading.
AI Measurement: What We Know and What We Don't
A summary of the AI search measurement landscape as of June 2026, clarifying what is and isn't possible with the new GSC report.
What can be measured now
- •AI Overview and AI Mode impression counts (GSC Gen AI Performance Report)
- •Referral traffic from chatgpt.com, perplexity.ai, and similar AI services (GA4 traffic acquisition)
- •Total organic traffic in the standard GSC Performance report (AI Overview clicks are mixed in)
What cannot be measured now
- •Clicks via AI Overview citation links (cannot be isolated in GSC)
- •The scale of zero-click impact from AI Overviews (users satisfied without visiting)
- •Traffic from AI Mode where the origin can be attributed to AI Mode specifically
- •Brand mention counts in chat-based AI like ChatGPT or Claude (no tooling available)
The Gen AI Performance Report is a genuine step forward — it opens a window into AI Overview visibility that simply didn't exist before. But impressions alone are insufficient to assess how AI search affects your business metrics. The pragmatic call is to keep improving SEO quality while the tooling matures.
Written by
今井政和SEO Director / Frontend Developer
SEO Director with 20+ years of web industry experience. Creator of CodeQuest.work SEO and the official WordPress plugin "ORECTIC SEO CHECK." Author of a book on web strategy inspired by Edo-era merchant principles.
@imai_directorFAQ
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