A PPC audit is a structured review of paid search performance, account setup, and optimization opportunities—but in 2026, that definition is incomplete unless it also covers AI search surfaces. With $63 billion in Google Search revenue in Q4 2025, 48% of search queries showing AI Overviews, 25.5% of AI-generated results displaying ads, and ad presence in AI results surging 394% year over year, the question is no longer whether to audit your account. It is when and who can do SEM audit work well enough to keep you visible.
The answer, increasingly, is the best SEM agencies for PPC audits. A modern review has to account for Google AI Mode, AI Overviews, user behavior shifts, and monetization layers that did not exist in classic paid search analysis. Google AI Mode already has 75 million daily active users, 100 million monthly active users, and by July 2025 it reached 1% of searches, up from 0.25% in May 2025. That is not a small trend. It is a channel shift.
A PPC audit today is not just about keywords and bids. It is about understanding how paid visibility behaves when AI surfaces, click patterns, and ad placements are changing at the same time.
The search landscape is moving fast, and your PPC account needs to move with it. Google AI Mode grew from its May 2025 launch to 75 million daily active users by late 2025, a roughly 4x expansion. In the same window, the share of searches using AI Mode jumped from 0.25% in May 2025 to 1% by July 2025. That may sound small in percentage terms, but at Google scale it is meaningful. AI Mode also processes 1 billion monthly queries across the United States and India, while standard Google Search reaches 2 billion+ monthly users and the standalone Gemini app has 450 million monthly users.
That scale matters because user behavior inside AI search is different. AI Mode sessions average 49 seconds, compared with 21 seconds for AI Overviews. Even more striking, 93% of AI Mode queries end without outbound clicks. For advertisers, that means the old assumptions about traffic flow no longer hold. A PPC audit has to evaluate not only search terms and bids, but also where ads appear, how users interact with AI surfaces, and whether visibility is being won even when clicks are not.
The monetization shift is already visible. Ads in AI Overview SERPs rose from roughly 3% in January 2025 to 25.5% in March 2026. For certain commercial queries, ads reached approximately 40% of AI Overview SERPs by November 2025. In other words, ads are not a fringe experiment inside AI search. They are becoming a core feature. That is why a modern PPC audit must now account for AI surface exposure, not just standard search placements.
Under the hood, Google is clearly building AI search as a revenue engine. There are 816 experiment IDs actively testing AI Mode monetization. AI Mode responses last 6+ seconds, and ads are fetched in parallel through AsyncDataService, which retrieves ad data within 60ms. At the same time, the fan-out technique issues 16 simultaneous queries. That is an engineered system, not a temporary side project.
For comparison, AI Mode shows no traditional organic results, while standard AI summaries may show 10 traditional blue links below them. That contrast is important. If you audit a PPC account while ignoring AI Mode, you are effectively auditing the visible dashboard and skipping the engine that powers it. On March 28, 2026, this distinction is especially relevant because AI monetization is no longer hypothetical; it is active, measurable, and expanding.
| AI Search Metric | Value |
|---|---|
| Google AI Mode daily active users | 75 million |
| Google AI Mode monthly active users | 100 million |
| AI Mode share of searches by July 2025 | 1% |
| AI-generated results showing ads | 25.5% |
| Year-over-year increase in ads in AI results | 394% |
AI-powered SERPs are compressing organic visibility, and that changes the value of paid search. For simple informational queries, CTR drops from 1.76% to 0.61% when AI features are present. For complex informational queries, Seer Interactive found a 46.7% relative CTR decline across 68,000 queries and 25.1 million impressions. Top-ranked pages are not immune either; they face a 34.5% CTR decline when AI Overviews appear.
There is one important exception: branded queries see an 18% CTR increase with AI Overviews. That does not cancel the broader problem. It simply shows that brand demand can still outperform the new friction. Meanwhile, 25% of organic search traffic is projected to shift to AI chatbots and voice assistants by the end of 2026. The implication is blunt. If organic reach is shrinking while AI surfaces increasingly show ads, a PPC audit is not optional. It is the only reliable way to keep visibility balanced.
Even AI Overview citations can generate brand impressions without clicks, which means your account may be influencing demand in ways your standard reports do not fully capture.
Some sectors are far more exposed to AI Overviews than others. Healthcare shows 88% AI Overview presence. Education follows at 83%. B2B Technology sits at 82%, Restaurants at 78%, Insurance at 63%, and eCommerce at approximately 45%. That is a risk map and an opportunity map at the same time.
High-exposure sectors need paid strategies that assume AI surfaces are part of the buying journey. Lower-exposure sectors cannot relax, because the pattern is still evolving. A specialized audit helps determine where visibility is being lost, where ad budgets can defend demand, and where the account should be repositioned for AI-driven search behavior.
The biggest challenge now is measurement fragmentation. Google Search Console does not separate AI Overview impressions from standard organic impressions, so reporting can blur what is really happening. At the same time, websites cited in AI Overviews generate brand impressions even without clicks. That means the signal exists, but it is not always cleanly labeled. A good PPC audit has to work through that ambiguity rather than pretending it does not exist.
A useful metaphor is the security check many sites use to verify traffic. This website uses a security service. A security service protects against malicious bots. The website verifies you are not a bot. This page is displayed while the website verifies you are not a bot. The point is simple: transparent reporting is often blocked by layers of verification, and search measurement can be just as obscured. Even the icon on that page may be marked with the alt text “1”, a tiny reminder that systems can hide more than they reveal.
Recent trend data reinforces why the analysis must be precise. BrightEdge tracked activity from February 2025 to February 2026, showing how quickly AI search behavior and visibility patterns are evolving. Competition is also widening beyond Google. ChatGPT Ads reached $100 million in annualized revenue in just six weeks, and Google has launched the Direct Offers format for tailored purchase-ready ads. The market is clearly moving toward more AI-native monetization, not less.
That is why the suggested action plan belongs in Q2 2026: audit the account now, interpret mixed signals carefully, and reallocate strategy around AI-aware visibility. A professional SEM agency can do that because it understands how to reconcile impressions, clicks, AI citations, and ad placements into one decision framework.
The bottom line is straightforward: the best SEM agencies for PPC audits are the ones that understand AI Mode, AI Overviews, ad monetization experiments, and sector-specific exposure. If you are asking who can do SEM audit work well in this environment, the answer is not a generalist who only checks keywords and bids. You need a partner that can interpret the 394% ad surge, the 46.7% CTR cliff, and the $63 billion Q4 revenue machine behind Google Search.
That is exactly why a focused, AI-aware review matters. It should identify where your account is losing visibility, where paid opportunities are emerging inside AI surfaces, and how your strategy should change by query type and industry. If you want a Google Ads Audit designed to handle these AI-driven challenges, get one from Delante and turn today’s search disruption into a clearer plan for performance.
