Google started launching AI Max for Shopping on April 30. I've had it running on one account for two weeks. The numbers are roughly what the launch docs warned about, if you read them carefully.
CTR on AI Max matched terms is about 400% higher than non-AI Max terms. CPA is ~15% higher. ROAS is ~15% lower. The search term report is full of "what do I need for…", "best… for beginners", and "X vs Y" comparison queries. Not buyers. Researchers.
This isn't a bug. The product is doing what it's designed to do. The high CTR is the part that will fool most operators into leaving it on.
AI Max for Shopping began rolling out to select Standard Shopping advertisers on April 30, 2026. The pitch: get Shopping placements inside AI Overviews and AI Mode results. Requires tROAS bidding. Google's framing is that consumer journeys are shifting "from product-centric to intent-centric," and AI Max is built to chase the conversational, mid-funnel queries AIO surfaces are generating.
I flipped it on for one Standard Shopping account two weeks ago. Here's what 14 days looks like next to the non-AI Max baseline.
- CTR on AI Max matched terms: ~400% higher than non-AI Max terms
- CPA: ~15% higher
- ROAS: ~15% lower
- Search terms: visibly less relevant to the campaign than the non AI Max terms, which I assume is due to the URL expansion feature that pretty much gives Google free reign. It is no longer bound by your segmented product groups.
Consistent across both weeks. Not a fluke.
The beta materials Google sent me explain everything.
1. The intent shift Google is solving for. Google is openly framing the new wave of queries as "neither purely Search nor Shopping." Things like "What do I need for a beginner's marathon?" or "Top rated carbon bikes under $3K." AI Max exists to chase those.
2. Your feed is no longer the boundary. Google now treats the GMC feed as a "rich database of commercial truths," but layers a crawl of your category and filtered pages on top to expand what it thinks you sell. It isn't matching feed attributes anymore. It's reading your whole site.
3. Feed-based Final URL Expansion (FUE) is the engine. FUE expands serving eligibility beyond traditional PLAs by identifying "other high-value commercial URLs" on your domain and auto-generating search ads against "complex mid-funnel commercial queries." The final URL is dynamic. The system picks the landing page. Functionally, this is DSA bolted onto your Shopping campaign.
4. Text customization is a required prerequisite for FUE. You can't get the reach expansion without letting Google rewrite your ad copy to match those off-product queries. The two are bundled in concept but they're separate toggles in the UI. That distinction matters (see takeaway 4).
So the intent signal driving these matches isn't your keyword (Shopping has no keywords), and it isn't really your feed either. It's Google's AI interpreting your crawled site content against a conversational query. That's why the search terms look weird.
A 400% CTR lift sounds like a win until you look at who's clicking. Someone searching "what do I need for a marathon?" is three weeks away from buying anything, and probably from a different brand by the time they decide. You're paying to be educational content in someone else's funnel. That's the cheapest, least-valuable click in the buying journey.
The reporting tells you everything is great. CTR up. Impression share up. Engagement up. ROAS is the only number quietly bleeding, and on blended dashboards it gets absorbed.
That's also why most teams won't catch it for 90 days. The metrics that move first are the metrics most agencies report on first.
Per Google's own materials, AI Max is "best fit for heavy Standard Shopping users with strict shopping channel controls" and explicitly NOT recommended for heavy pMax users (the same capabilities are already baked into pMax).
The profile that should test it:
- Broad catalogs with deep on-site content (so the crawl has something to chew on)
- Research-heavy, high-consideration categories: furniture, fitness equipment, premium apparel, outdoor gear
- Accounts running Standard Shopping with zero pMax exposure
- Willing to run tROAS (required)
If you're already on pMax, skip this. You're double-paying for the same matching logic.
Google is moving Shopping toward intent-based matching because that's where AI Overviews and AI Mode are pushing query volume. That part is real. But the matching is being trained against your crawled site, not your feed, and the queries it's catching sit upstream of the purchase decision.
If you sell on intent (high-consideration verticals with strong content), there's a real test here. If you sell on price, availability, and SKU specificity, AI Max is going to spend your money educating people who buy from someone else.
Either way: opt in deliberately, isolate the spend, and watch ROAS, not CTR.