Bottom line: the best PPC agencies for auditing Google Ads accounts and optimizing conversion paths are now essential because AI Overviews and AI Mode are reshaping paid search in real time. AI Overviews appear on 48% of all Google search queries, ads show in 25.5% of AI Overview SERPs, and paid CTR on AI Overview queries has crashed 68% from 19.70% to 6.34%. If you are managing Google Ads, a professional Google Ads audit is no longer optional; it is the fastest way to protect performance and improve conversion path optimization.
Google’s AI search shift is now too large to treat as experimental. By late 2025, Google AI Mode reached 75 million daily active users and more than 100 million monthly active users, a 4x jump from its May 2025 launch. AI Mode also processes over 1 billion monthly queries across the US and India, while 93% of AI Mode queries end without a click to an external website. That means PPC teams must optimize for visibility, citations, and conversion paths, not just the click.
AI Overviews and AI Mode are not side features. They are now central to Google search behavior, ad delivery, and user decision-making.
The scale is massive. Standard Google Search reaches 2 billion monthly users, while the standalone Gemini app has 450 million monthly users, now 750 million after surge. This is not a niche audience. It is the new core search environment that PPC managers must plan around.
Session behavior also shows why these surfaces matter. AI Mode users spend 49 seconds per session, compared with 21 seconds for AI Overviews in standard search. AI Mode usage rose from 0.25% of searches in May 2025 to more than 1% by July 2025. Meanwhile, AI Overviews are available in 200 countries and territories, support 40+ languages, and had expanded from 100+ countries and 20+ languages as of January 2025.
| Metric | Value |
|---|---|
| Standard Google Search monthly users | 2 billion |
| Gemini app monthly users | 450 million, now 750 million after surge |
| AI Mode session length | 49 seconds |
| AI Overviews session length in standard search | 21 seconds |
| AI Mode usage growth | 0.25% in May 2025 to over 1% by July 2025 |
| AI Overview availability | 200 countries and territories, 40+ languages |
Google’s financial signals confirm the same direction. Alphabet’s annual revenues exceeded $400 billion in FY 2025, and total advertising revenue hit $82.28 billion in Q4 2025. GenAI product revenue grew 400% year over year in Q4 2025, Google deployed Gemini 2.5 to power AI Overviews, and 8 million paid seats of Gemini Enterprise have been sold. Even Circle to Search is now available on 580 million Android devices.
Click erosion is the core problem. Seer Interactive analyzed 68,000 real queries, including 25.1 million impressions for AI Mode zero-click behavior, 53 brands and 5.47 million tracked queries in the 2026 update, and 3,119 search terms from June 2024 to September 2025. The pattern is clear: AI surfaces are changing both paid and organic outcomes.
For simple informational queries, CTR dropped 61%, from 1.76% to 0.61% organic CTR. Complex informational queries saw a 46.7% relative CTR decline. Commercial and comparison queries suffered a 15% organic CTR drop. Branded queries are the exception, showing an 18% CTR increase with AI Overviews.
Position matters too. When AI Overviews appear above the page, position‑1 organic results see a 34.5% CTR decline. Overall organic CTR on AI Overview queries fell from 1.76% in June 2024 to 0.61% in September 2025. On queries without AI Overviews, organic CTR still dropped from 2.74% to 1.62%, a 41% decline. The AI Overview box is now about 1,200 pixels tall on average, peaking at 1,340 in December 2025, which is larger than a 900-pixel viewport and pushes results below the fold.
Paid performance is unstable as well. Paid CTR on AI Overview queries ranged from 13–16% in 2025 and 2026, yet the broader paid CTR picture still showed a 68% drop from 19.70% to 6.34%. Brands cited in AI Overviews earned 91% higher paid CTR than uncited brands in Seer’s September 2025 analysis. In clicks per million impressions, the gap is equally stark: 33,500 for queries without AI Overviews, 20,743 for cited brands with AI Overviews, and 9,445 for uncited brands with AI Overviews.
There is also a citation advantage. Brands cited in AI Overviews earn 120% more organic clicks per impression. Organic CTR floor on AI Overview queries bottomed at 1.3% in December 2025, then recovered 85% to 2.4% by February 2026. Semrush also found the zero-click rate for AIO keywords dropped slightly from 33.75% to 31.53%. Even with these shifts, Google maintained 90% search market share, total search impressions grew 49%, and click-throughs declined 30%.
Not every query is exposed equally. Seer’s intent analysis of 49,353 queries shows that 36% of informational queries trigger AI Overviews, compared with 8% of commercial queries and 5% of transactional queries. Yet the commercial share of AIO triggers grew from 8.15% in January 2025 to 18.57% by October 2025.
Transactional triggers rose from 1.98% to 13.94% over the same period, while navigational triggers increased from 0.84% to 10.33%. That is why PPC teams cannot rely on old assumptions. There is a 7x gap between informational and transactional trigger rates, and query format matters just as much.
Comparison queries trigger AI Overviews 95.4% of the time. Question-format queries trigger them 85.9% of the time, review queries 86.3%, and “near me” informational queries 76.9%. Single-word queries are far less likely, at just 27.3%. Industry exposure is also uneven: Healthcare 88%, Education 83%, B2B/Enterprise Tech 82%, Restaurants 78%, Insurance 63%, and eCommerce ~45%.
Semrush’s broader keyword study tracked 10 million keywords and found AI Overview prevalence at 6.49% in January 2025, peaking at 24.61% in July 2025, then settling at 15.69% by November 2025. BrightEdge measured 31% presence in February 2025, rising to 48% in February 2026, a 58% YoY increase. Importantly, 60% of keywords in the Semrush study had 100 or fewer monthly searches, showing how heavily AI Overviews target long-tail demand.
Citation patterns show where visibility concentrates. Across 46 million citations and 36 million AI Overviews, Surfer SEO found the top sources were YouTube 23.3%, Wikipedia 18.4%, and Google.com 16.4%. Industry-specific patterns are equally revealing: in Health, NIH 39%, Healthline 15%, and Mayo Clinic 14.8%; in Gaming, YouTube 93% and Reddit 78%; in Finance, YouTube 23%, Wikipedia 7.3%, LinkedIn 6.8%, and Investopedia 5.7%.
Organic overlap with AIO citations grew from 32.3% to 54.5% overall, a 22.3 percentage point increase. Insurance overlap reached 63%, while overlap ranges sit between a lower bound of 48.7% and an upper bound of 53.1%. Niche changes were sharp: Entertainment rose from 3.2% to 18.5% (+15.3 pp), Travel from 5.7% to 17.7% (+12 pp), eCommerce from 2.9% to 13.4% (+10.5 pp), and Education by 53.2 pp.
This is now a monetized environment. Ads in AI Overview SERPs were present on only 3% of SERPs in January 2025, then soared to 40% by November 2025, reflecting 394% growth in combined ad-plus-AIO SERPs. In November 2025, 40% of certain commercial query categories showed ads inside AI results.
Placement is fluid. In AI Overviews, 80% of ads appear below the AI box, 18–20% appear above it, and 25% appear at the bottom of SERPs. Google is also running 816 active experiment IDs to test monetization in AI Mode. AsyncDataService fetches ad data within 60ms alongside AI responses, while AI responses typically last 6+ seconds, giving ads time to load and surface.
Google has launched the Direct Offers format for purchase-ready ads. AI Mode does not show traditional organic results; it replaces them entirely. And Google’s January 2026 update lets users jump from AI Overviews directly into AI Mode conversations, closing the loop for advertisers. AI Mode query length is 3x longer than traditional searches, and 1 in 6 queries uses non-text input. Since ranking-style content in AI Overviews has decreased 60% since May 2024, classic ranking logic alone is no longer enough. Only 17% of sources cited in AI Overviews also rank in the organic top 10.
The funnel shift is bigger than Google. ChatGPT Ads reached $100 million annualized revenue in just six weeks, showing how quickly AI ad products can scale when demand concentrates inside conversational interfaces.
Traffic signals across the web point in the same direction. Google Search referral traffic to publishers declined by about a third globally; US organic Google Search traffic fell 38% YoY; and Google Discover dropped 21% globally and 29% in the US. Publishers expect a 43% traffic decline over the next three years, and one-fifth anticipate losses exceeding 75%.
By contrast, ChatGPT accounts for just 0.02% of publisher referral traffic and Perplexity only 0.002%. Alphabet generated $54.03 billion in Q4 2024 search revenue, which helps frame the jump to $63.07 billion in Q4 2025. Penske Media Corporation has already filed an antitrust lawsuit against Google, underscoring how disruptive these changes have become.
The broader conclusion is consistent: AI Overview citation overlap with organic rankings increased by 22.3 percentage points, and the organic CTR on queries without AI Overviews still dropped 41%. This is not only a SERP issue. It is a full-funnel shift in trust, discovery, and conversion behavior.
Audits now need to reflect the new search reality. With 25.5% of AI Overview SERPs showing ads and AI Mode operating as a pure ad environment, PPC accounts must be reviewed for placement strategy, query intent, and conversion-path performance. The old approach of simply managing bids is too shallow for this market.
The case for a specialized Google Ads audit is now technical as well as strategic. Paid CTR can crash from 19.70% to 6.34%, yet cited brands can still earn a 91% premium and a 13–16% range shows just how much placement and citation strategy matter. Because ad data is fetched within 60ms, campaigns must be optimized for real-time insertion, not delayed assumptions.
Conversion-path optimization is equally urgent. With 93% zero-click AI Mode behavior, the audit has to extend beyond the click itself. It should account for 48% query presence, 1,200px boxes, rising commercial-intent triggers, keyword-intent migration, bid adjustments, asset optimization for AI-generated summaries, and alignment with Direct Offers.
Just as important, organic and paid teams can no longer operate in separate lanes. A 54.5% citation overlap with top-100 organic results shows how tightly organic visibility influences AI ad eligibility. That makes the best PPC agencies the ones that can bridge SEO and PPC, read the new AI-led SERP structure, and translate that into revenue-focused changes.
The landscape has changed forever. AI Overviews and AI Mode demand a complete overhaul of how you manage Google Ads. Don’t let your campaigns fall into the 68% paid CTR crash. Partner with Delante for a comprehensive Google Ads Audit that maps every keyword to its new AI-driven reality, rebuilds your conversion paths for zero-click environments, and ensures your brand earns the citations that boost clicks by 120%.
