Should your agency turn on Google AI Max for Search? Yes — but flip on the pieces in order, not all at once. Turn on search term matching and text customization first, with brand negatives and Text Guidelines in place, because that's where the dependable lift lives: Google reports roughly 7% more conversions or conversion value at a similar CPA/ROAS when the full suite runs versus search term matching alone. Be slower with Final URL expansion until you've told Google which pages it's allowed to send traffic to. And don't wait for the forced migration — Google just pushed the automatic DSA handoff to February 2027, which gives you runway to do this deliberately on client accounts instead of waking up to it.
Here's the part most "AI Max guide" posts get wrong: it isn't a new campaign type you go build. It's a set of switches inside the Search campaigns you already run. That distinction changes everything about how you adopt it.
What Google AI Max Actually Is
AI Max is a feature suite you toggle on within existing Search campaigns. It came out of beta in April 2026. It has three independent parts, and the whole point of that independence is that you don't have to accept all three to get the good one.
Search term matching (keywordless). Google's AI — broad match plus its "keywordless" tech — reads your existing keywords, ad creative, and landing pages, then finds relevant queries you never added to the account. If someone searches something that genuinely maps to the service and there's no matching keyword, AI Max can still serve.
Text customization. AI Max pulls from your landing page, headlines, and descriptions and generates ad copy tailored to each query. The goal is that the ad speaks to what the person typed, not to the keyword cluster you built six months ago.
Final URL expansion. Instead of always sending traffic to the URL you set, AI Max routes each user to the page on your domain it predicts will convert best for that query.
The lift number Google publishes — ~7% more conversions or value at similar efficiency — is for the full suite versus search term matching alone. That's real, but it's an average across a lot of accounts, and averages hide the accounts where Final URL expansion quietly sent paid clicks to a blog post or a legal page. Which is exactly why we don't enable all three at once.
The Deadline Nobody Updated: February 2027, Not September
If you read an AI Max guide written in early 2026, it probably told you that Dynamic Search Ads, ad customizers, and campaign-level broad match get absorbed into AI Max in September 2026, and that you needed to scramble.
That date moved. Google postponed the automatic migration of DSA to AI Max from September 2026 to February 2027 on its Ads Developer Blog. The direction is unchanged — DSA is being retired and keywordless Search lives inside AI Max now — but you have more runway than the panic posts claim.
Use it. The worst version of this is letting the auto-migration flip everything on for you, on Google's schedule, with default settings, across every client at once. The better version is enabling it yourself, one campaign at a time, with the controls set the way you'd want them. We're doing the second on every account we manage, and we're not treating February 2027 as the start date — we're treating it as the deadline we want to be finished well before.
Which Switches to Flip, and in What Order
Here's how we score the three features on client accounts. The order matters more than the toggle.
| Feature | What it does | The real risk | Our call | |---|---|---|---| | Search term matching | Finds relevant queries with no matching keyword | Brand-term and irrelevant matches sneak in | Turn on first — with brand/competitor negatives | | Text customization | AI writes ad copy per query | Off-brand claims, wrong tone | Turn on second — after setting Text Guidelines | | Final URL expansion | Sends each user to the "best" page | Traffic lands on legal, checkout, or thin pages | Turn on last — with a page allow-list |
Search term matching is the safe win as long as your negative keyword list is doing its job. Add brand and competitor terms as negatives before you enable it, or keywordless matching will happily spend budget re-buying searches you'd win organically.
Text customization is safe once you've set Text Guidelines — the governance layer that tells the AI what it can and can't say, and how your brand sounds. Set them first. If you enable dynamic copy without guidelines on a regulated client (finance, health, legal), you're one hallucinated headline away from a compliance problem. We treat Text Guidelines as mandatory, not optional, and we write ad copy the model can safely riff on rather than fight — the same discipline behind ad copy that actually converts.
Final URL expansion is the one to slow down on. The "best page for this query" is Google's guess, and on real accounts we've watched it route paid clicks to blog posts and thin category pages that convert nothing. Enable it last, list the pages Google is allowed to use, and exclude checkout, legal, and low-intent pages.
The Attribution Problem AI Max Creates
This is the part that hits agencies running paid Search alongside real attribution, and it's the one we care about most.
Keywordless matching means the query that converted often isn't a keyword in your account. Final URL expansion means the landing page can change per user. Stack those together and last-click GA4 reporting starts lying to you — you see conversions, but you've lost the thread on which query and which page produced them. If you're bidding on client-side signal, Smart Bidding is now optimizing on a blurrier picture than you think.
The fix isn't to avoid AI Max. It's to make your tracking independent of Google's guesses. We run first-party click capture and server-side conversions through Hyros or server-side GTM on every paid account, so a conversion is tied to the actual click and the real revenue regardless of which query Google matched or which page it chose. Get that in place before you enable AI Max, not after you notice the numbers drifting. It's the same failure mode we broke down in the Google Ads / GA4 attribution mismatch fix, just triggered by a new cause — and it's why our Hyros attribution setup is the first thing we do on a paid account, not the last.
Does AI Max Change the Google-vs-Meta Budget Question?
A little, and in Google's favor at the top of the funnel. Keywordless matching widens Search's reach into intent you weren't explicitly bidding on, which makes Search feel more like a discovery channel than it used to. But it doesn't change the fundamentals of where a dollar works hardest for a given client — that still comes down to intent, funnel shape, and creative, which we walk through in Google Ads vs Meta Ads for Dallas businesses. AI Max makes Google's side more automated; it doesn't make the channel choice for you.
How to Tell If AI Max Is Actually Working
The mistake we see agencies make is turning AI Max on, watching conversions tick up, and calling it a win — without a baseline. Conversions can rise because AI Max found genuinely new demand, or because keywordless matching started re-buying brand and near-brand searches you'd have won for free. Those look identical in the conversions column and are opposite outcomes for the client.
So set the baseline before you flip anything. Screenshot the last 30 days of CPA, ROAS, and conversion volume per campaign. After you enable AI Max, judge it on incremental CPA and ROAS at the campaign level, not raw conversion count — and read the search terms report to see whether the new queries AI Max is matching are actually new intent or just cheaper-looking brand traffic. If your incremental cost per real sale held or improved and the new queries are non-brand, keep it on. If CPA held only because brand crept in, tighten your negatives and re-test.
This is also where the server-side tracking pays off a second time: with Hyros or server-side GTM tying conversions to real revenue, you can see whether AI Max's extra conversions carry the same average order value or whether they're lower-quality leads padding the count. Volume that doesn't convert to revenue isn't a win, and client-side reporting won't tell you the difference.
The Bottom Line
AI Max is a switch, not a strategy. The lift is real, the automation is genuinely useful, and the forced migration is coming in February 2027 whether you plan for it or not. So do it on your terms: fix server-side tracking first, turn on search term matching with brand negatives, set Text Guidelines before text customization, and constrain Final URL expansion last. Read the search terms report every week for the first month. That's the whole playbook.
If you're running paid Search on client accounts and you're not sure whether AI Max is helping or quietly corrupting your attribution, that's exactly the kind of thing we check in a free automation audit — we'll look at your tracking, your AI Max settings, and whether Smart Bidding is optimizing on signal you can actually trust.