Google is steering more searches toward AI features, but as of 30 September 2026 I could not find evidence that AI Mode has replaced the standard results as the default. Press Gazette's report on Google's May 2026 announcement said AI Mode remains optional, with blue links below AI summaries. What is true is that AI Overviews, which do appear by default, are growing, and the best available studies show they cut clicks to publishers. Here is the evidence, its limits and a measurement plan.
Key Takeaways
- "Pushed into AI Mode" is partly true: Google added follow-up paths from AI Overviews into AI Mode, but reported coverage says AI Mode is not the default.
- Similarweb data reported by TechCrunch says AI Overviews appeared in 43% of searches, up from 15% a year earlier.
- A randomised experiment by researchers at the University of Pennsylvania and Northeastern found AI Mode reduced external click-through by 18.8 percentage points.
- Ahrefs and Pew both report large click reductions when AI summaries appear, though they measure different things.
- Google reports its own numbers, over 2.5B monthly users for AI Overviews and over 1B for AI Mode, which are user counts, not traffic outcomes for you.
- Track impressions, clicks and branded demand separately; do not react to one headline.
The news: what Google actually announced
At its May 2026 search event, Google announced AI agents that can carry out search tasks, interactive visuals, file and photo input, notifications, and conversational follow-ups from AI Overviews, according to Press Gazette. The same report says AI Mode remains optional, not default.
SEO voices reacted differently. Lily Ray said many businesses could "breathe a small sigh of relief" that AI Mode was not becoming default, while warning the new features would keep cutting into organic traffic. Barry Adams expected limited impact on news publishers, since breaking news is relatively protected. Another strategist called it "one more nail in the coffin". Those are opinions, and they disagree.
"Default" is doing a lot of work
Let me separate three claims that get mixed up.
| Claim | What the evidence says | Confidence |
|---|---|---|
| AI Mode is the default search | Not according to Press Gazette's May 2026 report | Fairly high, but check your own market |
| AI Overviews appear by default | Similarweb: 43% of searches, per TechCrunch, 27 July 2026 | Moderate; third-party estimate |
| Google encourages moving from AIO to AI Mode | Announced follow-up flows from AI Overviews | High |
If someone tells you Google "forced" AI Mode on everyone, ask for the source. If they say Google is nudging users toward conversational AI, the announcement supports that.
What the traffic data shows
Observational studies
- Pew Research Center, as summarised by Search Engine Journal: 8% of visits included a click on a traditional result when an AI summary appeared, versus 15% without.
- Ahrefs: a 34.5% click reduction for position one on informational keywords in one study; The Next Web reported a later February 2026 Ahrefs finding of a 58% reduction for top-ranking pages. Different datasets and dates, so do not average them.
- Chartbeat, via The Next Web: Google search referrals to more than 2,500 news sites fell 33% in 2025.
- Amsive found branded queries with AI Overviews saw an 18% higher CTR, which cuts against the doom narrative.
The experiment
The strongest causal evidence I found (summarised by TechWyse) is a paper, "AI in Search Reduces Publisher Referrals Without Improving User Experience," from the University of Pennsylvania and Northeastern. Its 1,100 US participants were randomly assigned conditions. AI Mode reduced external click-through by 18.8 percentage points, and removing AI features raised it by 8.8 points. Caveat from the authors: Google changed AI Overview HTML mid-study, so the extension hid AI Overviews in only 51.1% of "no AI" cases, which may distort the control group.
Google's own numbers, and why they do not settle it
Google reports AI Overviews above 2.5 billion monthly users and AI Mode above 1 billion monthly users. These are Google-reported audience figures. Similarweb's AI Mode measure, 279 million visits in May 2026 up from 126 million in June 2025, is a different metric (visits, third-party). Neither tells you what happened to your clicks.
What Google says it is doing for publishers
Google's "Preferred Sources" feature lets readers mark publications as favourites so they appear more prominently across Search, Discover and Google News. On 20 August 2026, Google launched an embeddable button for publishers, per TechCrunch. Google reports people are twice as likely to click a preferred source when it is available, and that more than 345,000 unique sources had been selected by the May launch. That is Google's claim, and it depends on readers choosing to opt in. It is a tool, not a guarantee.
Publishers have also gone legal. The Next Web reports Penske Media filed an antitrust lawsuit over AI Overviews' impact and the European Publishers Council filed a complaint with the European Commission. I have not independently checked those filings.
A fair reading: three things can be true at once
- Google is investing in AI-first search experiences and steering users toward them.
- AI features reduce clicks on average, with big variance by query type and site.
- AI Mode is not (per the reporting I could verify) the default, and news, brand and navigational queries behave differently.
I would distrust anyone who says only one of these.
Your measurement plan
Week 1: Separate the signal
- In Search Console, export impressions, clicks and CTR by page for the last 16 months.
- Segment queries into branded, informational and transactional.
- Note the dates of Google's announcements on the chart.
Week 2: Test for AI exposure
- Take 50 informational queries. Search each on mobile and desktop, logged out, and note whether an AI Overview appears.
- Compare CTR for queries with and without AI Overviews.
- Use Search Console's generative-AI impressions report, expanded worldwide on 31 August 2026, but remember it shows impressions only.
Week 3 onward: Act
- Protect queries where you are the brand or original source.
- For informational queries that lose clicks, decide if they are worth the effort or if they exist mainly as top-of-funnel awareness.
- Track email signups, direct visits and branded search as an independent signal of demand.
What content holds up
- Original data, first-hand testing and named expertise that an AI summary cannot replicate.
- Tools, calculators and downloads.
- Content that answers the follow-up question, since AI Overviews now invite follow-ups.
- Newsletters, communities and social channels you own.
Owned channels such as email and social do not depend on Google's interface decisions, which is why I build them alongside search work.
What I would not do
- Panic-cut content based on one headline.
- Block AI features wholesale without testing. Google's AI opt-out control (reported as launched 31 August 2026) is not a ranking signal, but I have not verified its behaviour in detail, so read Google's documentation before using it.
- Stuff "AI-friendly" tricks into pages. Basic quality and clarity still matter.
As of 30 September 2026
These findings will age. Google ships changes monthly, and the studies cited use different periods and samples. Check dates before quoting.
FAQ
Is AI Mode the default in Google Search?
According to Press Gazette's report on Google's May 2026 announcement, AI Mode remains optional and blue links continue to appear. AI Overviews, however, appear by default on many queries. Check your own market and device.
Does AI Mode reduce clicks to websites?
The University of Pennsylvania and Northeastern experiment found it reduced external click-through by 18.8 percentage points among 1,100 US participants. The researchers flag a technical limitation in their control condition, so treat the magnitude cautiously.
How often do AI Overviews appear?
Similarweb data reported by TechCrunch put AI Overviews at 43% of searches in a period ending May 2026, up from 15% a year earlier. Third-party estimates vary by dataset.
Are all publishers losing traffic equally?
No. Digital Content Next members reportedly saw losses from 1% to over 75%, per The Next Web. Branded and breaking-news queries appear more resilient.
What is Google's Preferred Sources feature?
It lets readers pick favourite publications to appear more prominently in Search, Discover and News. Google reports people are twice as likely to click a preferred source, but this is Google's own figure.
Should I opt out of Google's AI features?
Consider testing rather than blanket blocking. Google's new control is reported as not being a ranking signal, but check Google's documentation and weigh the loss of visibility.
Does ranking #1 still matter?
Yes, but its click value is lower when an AI summary sits above you. Ahrefs and Pew both report notable CTR reductions in those cases.
How can I see AI Overview impact in Search Console?
The generative-AI report, expanded worldwide on 31 August 2026, shows impressions by page, country, device and date. It does not show clicks, so combine it with your standard performance data.
Will Google make AI Mode the default later?
Nobody outside Google knows. I would watch announcements and your own data rather than predict it.
Let us plan for the traffic you actually have
I help publishers and startups separate real traffic shifts from headlines and build owned channels around them. With 4+ years of marketing experience in organic growth, SEO and AEO, I can help you set up the measurement above. See my work and reach me through the contact form at https://younusfardeen.in.
Sources: Press Gazette, TechCrunch on Similarweb data, TechCrunch on Preferred Sources, Search Engine Journal, The Next Web.