AI Max for Search Campaigns: What It Actually Changes, and What You Still Control

If you’re running Dynamic Search Ads right now, you have a decision coming whether you want one or not. Google restored the ability to create new DSA campaigns in June 2026 after briefly restricting it, but that’s a temporary reprieve, not a reversal. Starting in September 2026, campaigns using Automatically Created Assets and campaign-level broad match will begin auto-upgrading. By January 2027 you won’t be able to create a new DSA campaign at all, and in February 2027 anything still running gets automatically migrated to Performance Max or an AI-powered Search setup, whether you’ve prepared for it or not.

The replacement for most of that traffic is a feature called AI Max for Search. It’s been rolling out since mid-2025, it’s now available to every advertiser globally with no spend minimum, and it’s quietly becoming the default way Search campaigns find new queries. A lot of account managers have either turned it on without really understanding what changed, or left it off because the framing — “let AI handle more of your account” — sets off the same alarm bells as every other “just trust the algorithm” pitch Google has shipped over the past few years.

Both reactions are understandable. Neither is a great strategy. This post walks through what AI Max for Search actually does mechanically, what you still control, where the real risk sits, how it compares to the broad match you already know, and how to roll it out without finding out the hard way that “AI” doesn’t mean “unsupervised.”

What AI Max for Search actually is

First, the thing everyone gets wrong: AI Max is not a new campaign type. You won’t find it in the campaign-type picker next to Search, Performance Max, or Demand Gen. It’s an optimization layer that sits inside your existing Search campaigns, turned on through a section in campaign settings. Think of it less like switching cars and more like adding a more aggressive autopilot to the one you’re already driving.

Once enabled, AI Max brings together a handful of features that previously existed in separate, more limited forms: broader search term matching that goes beyond your exact keyword list, automatic final URL selection across your site, and AI-assisted headline and description generation. None of these are entirely new ideas — DSA has been finding pages and generating headlines for a decade, and broad match has always taken some liberties with matching. What’s new is that these capabilities are now bundled together, sit on top of your regular keyword-based Search campaigns instead of living in a separate ad type, and lean much more heavily on the campaign’s Smart Bidding signal to decide what counts as a good match.

You can turn AI Max on for an existing Search campaign from the campaign’s Settings tab — there’s a dedicated AI Max section you expand and toggle on, then choose which individual features within it you want active. It’s also offered as a step during the creation flow for a brand-new Search campaign. Either way, it applies at the campaign level first; some of the finer controls can then be adjusted down at the ad group level once the campaign-level switch is on.

The two features that actually move the needle

Of everything bundled into AI Max, two features do almost all of the work: Search Themes and Final URL Expansion. Everything else — the asset generation, the text customization — is secondary to these two, because they’re what changes which auctions your ads enter in the first place.

Search Themes are the broad-match evolution of keywords. Instead of a keyword you’re bidding on, a Search Theme is a topic or phrase you feed the system as a directional signal — something closer to “what this ad group is about” than “match this exact term.” Google then decides which actual queries are close enough to that theme to trigger your ad, using the same conversion and landing page signals it uses for standard broad match, just with a wider net. If you’ve ever watched broad match keywords pull in queries you’d never have typed yourself, Search Themes are that same mechanic with the leash let out a bit further.

Final URL Expansion is the other half. It’s an opt-in, campaign-level setting that’s turned on by default the moment you opt into AI Max, and it lets the system send traffic to any page on your domain that it judges relevant to the query — not just the final URL you set on the ad or keyword. In principle, it’s supposed to route a search for “return policy” to your returns page even if your ad group was built around a product landing page. In practice, it means you’re trusting an algorithm to make ad-to-page routing decisions that used to be entirely yours. If your site has thin, outdated, or poorly structured pages sitting around, this is the feature that will find them and send paid traffic to them.

Both features are gated behind Smart Bidding. Search term matching, URL expansion, and AI-generated text customization all require a conversion-based bidding strategy — Target CPA, Target ROAS, Maximize Conversions, or Maximize Conversion Value — to actually do anything. If you’re still running manual CPC or a click-based automated strategy, turning on AI Max mostly does nothing, because the system doesn’t have a conversion signal to expand against.

That’s worth knowing before you evaluate whether AI Max is for you: the underlying question isn’t really “should I use AI Max,” it’s “do I trust my conversion data enough to hand a bidding algorithm more room to work with.” If you’re not confident in your conversion tracking, that’s the thing to fix first — see our walkthrough on auditing conversion tracking before you touch this setting, and our comparison of Target CPA, Target ROAS, and Maximize Conversions if you haven’t settled on the right bidding strategy yet.

How this is actually different from the broad match you already know

The most common question from anyone who’s managed a Search account for a few years is fair: isn’t this just broad match with a new name? Not quite, and the distinction matters for how much scrutiny you apply.

Standard broad match still starts from a keyword. Google expands around that keyword’s intent, but the keyword itself anchors the matching — you’re telling the system “start here” even when it wanders. A Search Theme doesn’t start from a keyword at all. It starts from a topic, which is a looser anchor by design, and the system has more latitude to decide what counts as relevant before it even gets to the usual broad-match expansion logic layered on top.

The bigger structural difference is that broad match, on its own, never touched where the click landed. You picked the final URL, broad match only ever changed which query got you there. Final URL Expansion changes that too, which means AI Max is really two separate expansions stacked on each other: a looser net on the query side, and a second decision layer on the landing page side. Each one individually is a modest extension of tools you’ve already used. Combined, and running by default together the moment you opt in, they compound in a way that’s worth treating differently than “broad match, but more of it.”

What you still control

The framing around AI Max — “AI handles more of your account” — makes it sound like a hands-off switch. It isn’t, and the controls that exist are worth knowing before you decide how much to trust it.

Negative keywords are still respected with AI Max turned on. This is the single most important guardrail you have, and it means your existing negative keyword lists don’t get overridden just because you opted into broader matching — they still block the queries they’ve always blocked. If you don’t currently have a disciplined negative keyword process, this is the moment to build one, not after you’ve expanded matching and started bleeding spend on irrelevant queries.

Brand exclusions let you keep your ads from showing on searches that include competitor names or unrelated brand terms — useful if you’re worried about Search Themes pulling you into auctions you don’t want to be in. Brand inclusions do the opposite: they restrict matching so your ads only show on searches that include your own brand terms, which is a much tighter leash if you want to test AI Max cautiously on branded traffic first.

URL exclusions let you block Final URL Expansion from sending traffic to specific pages — your careers page, an old blog post, a support article that isn’t built to convert. If your site has pages you’d never want cold traffic landing on, exclude them explicitly rather than assuming the algorithm will figure it out on its own.

None of these controls are new concepts if you’ve managed a Search account before. What’s different is that they’re now doing more work, because the thing they’re constraining has more freedom than standard exact and phrase match ever had. A negative keyword list that was “good enough” under tighter match types can quietly stop being good enough once the net gets wider — it’s worth revisiting yours rather than assuming it still covers what it used to.

Why Dynamic Search Ads are actually going away

It’s worth being precise about the DSA timeline, because it’s shifted once already and the details matter if you’re planning around it. Google originally set a more aggressive migration schedule, then pushed it back after advertiser pushback, landing on the current dates:

• June 15, 2026 — the ability to create new DSA campaigns, which had briefly been restricted, was reopened.
• September 2026 — campaigns using Automatically Created Assets and campaign-level broad match settings start auto-upgrading to AI Max-powered Search.
• January 2027 — the ability to create new DSA campaigns is removed entirely, and Google begins sending reminder notifications to advertisers still running legacy DSA campaigns.
• February 2027 — any Dynamic Search Ads still running get automatically migrated, either to Performance Max or to an AI-powered Search setup, and the ability to create new DSA ad groups is permanently gone.

Google’s stated reason for the delay was giving advertisers “plenty of runway” and not forcing a migration through the Q4 shopping season, which is a reasonable thing to want to avoid regardless of how you feel about the underlying push. The practical takeaway is that this isn’t a feature you can ignore indefinitely if DSA is part of your account today. If your current setup leans on Dynamic Search Ads to catch long-tail queries your keyword lists miss, you’re going to end up either on AI Max-enhanced Search campaigns or on Performance Max whether you plan for it or not — and Performance Max audits are their own can of worms if you haven’t done one before. We’ve written about how to audit a Performance Max campaign when you can’t see inside it, which is worth reading if that’s where your DSA traffic is headed.

The better move is to get ahead of it: test AI Max on a controlled Search campaign now, understand what it actually does to your search terms and spend, and go into the eventual migration with a working setup instead of discovering the settings for the first time after Google has already flipped the switch for you.

The real risk isn’t losing control, it’s losing visibility

The pitch for AI Max, like most Google automation pitches, focuses on performance. Google’s own materials report that advertisers activating AI Max for Search typically see around 14% more conversions at a similar cost per acquisition, with the lift reportedly reaching as high as 27% for accounts that had been leaning heavily on exact and phrase match. Treat that the way you’d treat any vendor-reported number — it’s Google measuring the value of a Google feature, averaged across advertisers whose starting points vary enormously. It’s a reasonable signal that the feature can work, not a guarantee for your account.

The more useful conversation is happening outside Google’s own materials, among people who’ve actually turned it on. Two concerns come up repeatedly. The first is accuracy: reports from agencies point to cases where AI Max misread industry-specific nuance — pulling in clinical or technical claims that didn’t apply to the specific product, or generating text that was directionally right but wrong in a way that matters for regulated categories. The second is what one industry report described as spend leakage — budget that was meant for Search auctions ending up serving in adjacent placements instead, which is exactly the kind of drift that’s easy to miss if you’re not checking in regularly.

For anyone in a regulated industry — financial services, healthcare, legal, insurance — this matters more than it might for a typical ecommerce account. Google’s policy compliance checks on ad copy are not the same thing as your regulatory compliance requirements, and an AI-generated headline that passes Google’s review can still create a real problem for you. If you’re in one of these categories, the safer path is asset pinning — locking specific headlines and descriptions in place so the system can’t rewrite them — rather than turning on full text customization and hoping it stays within your compliance lines.

None of this means AI Max is reckless by design. It means the tradeoff Google is asking you to make is the same one it’s asked for years with broad match, Smart Bidding, and Performance Max: give the system more room to find opportunities, in exchange for checking more carefully that it’s using that room well. The size of the room has just gotten bigger, and the two things it now touches — query matching and landing page selection — are exactly the two things that, when they go wrong quietly, look identical to the slow account decay we described in 5 signs your Google Ads account is quietly wasting money.

Should you actually turn it on?

There’s a useful parallel here to Google’s own Optimization Score, which nudges advertisers to chase a number as close to 100% as possible. The consensus among people who manage accounts for a living is that the best optimization score usually sits somewhere in the 70-85% range, not 100% — because chasing full marks means accepting every recommendation uncritically, including the ones that serve Google’s revenue goals more than your account’s performance. Optimization score is a signal about how closely you’re following Google’s playbook, not a scoreboard of how well your account is actually performing.

AI Max deserves the same skepticism, applied the same way. The question isn’t “is AI Max good or bad,” it’s “does the specific tradeoff — broader matching and automatic URL selection in exchange for potential efficiency gains — make sense for this account, this industry, and this level of monitoring I’m actually willing to do.” A well-managed Search campaign running tighter, more traditional match types can outperform a loosely supervised AI Max rollout, the same way a deliberately-managed 74% optimization score account can outperform a blindly-applied 98% one.

The answer also depends a fair amount on what kind of business is behind the account. An ecommerce catalog with hundreds of well-built product and category pages has a lot less to fear from Final URL Expansion than a local service business with six pages total, where the “wrong” page for a query might just be the homepage instead of anything useful. A B2B or SaaS account with gated content and long, multi-step funnels needs to think harder about whether Search Themes will pull in top-of-funnel research queries that don’t fit a bottom-of-funnel campaign’s intent. An agency managing several regulated-industry clients has the least room for error and the most reason to lean on asset pinning and brand/URL exclusions from day one rather than treating this as a quick win to roll out everywhere at once.

Good candidates for an early, fuller rollout: accounts with clean, high-volume conversion tracking, a site with well-structured, high-quality landing pages across the board, and a team that actually reviews search term reports regularly. If any of those three things is missing, fix it first rather than layering more automation on top of a shaky foundation.

A practical way to roll it out

If you’ve decided to test AI Max rather than wait for the DSA migration to force the issue, here’s a sequence that keeps you in control of the experiment instead of just flipping a switch and hoping for the best.

• Start with one campaign, not your whole account. Pick something mid-volume — enough traffic to get a signal within a few weeks, not so much that a bad week burns your whole monthly budget.
• Set your guardrails before you turn anything on. Build out brand exclusions if competitor conquesting isn’t part of your strategy, add URL exclusions for any page you’d never want cold traffic landing on, and make sure your negative keyword lists are current. These controls work whether AI Max is on or off, so there’s no reason to skip this step.
• Check your conversion tracking is actually accurate before you lean on Smart Bidding harder. AI Max’s entire value proposition depends on the bidding algorithm having a trustworthy signal — bad conversion data in means bad matching decisions out, just wrapped in a more expensive-looking wrapper.
• Use a proper experiment, not a gut-feel before-and-after. Google Ads offers a dedicated AI Max experiment setup that lets you run a genuine split test against a control campaign, which is a meaningfully better way to isolate the effect than comparing this month to last month on a campaign where a dozen other things also changed.
• Pull your search term report weekly, not monthly, for the first month. This is the single most important habit here. AI Max widens what triggers your ads, and the only way to know if that’s finding genuine opportunity or just noise is to actually look at what it’s matching. Our guide to reading a Google Ads search term report covers what to look for and what to act on, and it’s more relevant now than it was before broad matching got this much more room to work with.
• Give it a full conversion cycle before judging it. Three days of data isn’t a test, it’s noise. Let the campaign run long enough for Smart Bidding to actually learn against the wider matching before deciding whether the lift is real.
• Decide deliberately whether to expand it. If the test campaign performs well and the search terms it’s pulling in make sense for your business, expand gradually. If it doesn’t, you’ve lost a controlled amount of budget on one campaign instead of finding out account-wide, right as Google forces the DSA migration on you anyway.

None of this is exotic advice — it’s the same discipline that’s applied to every other automated feature Google has shipped. What’s different with AI Max is the stakes are higher because it touches two things at once: what triggers your ads and where the resulting clicks land. Get either one wrong and it compounds, because a wrong query match sending traffic to the wrong page is a worse outcome than either mistake on its own.

A few questions worth settling before you enable it

Does turning on AI Max affect Quality Score? Not directly — Quality Score is still calculated the way it always has been, based on expected click-through rate, ad relevance, and landing page experience for the query that actually triggered the ad. What can shift is the mix of queries and landing pages feeding into that calculation, since a wider net brings in queries and destinations that weren’t part of the picture before. It’s an indirect effect worth watching, not a setting Google changes on its own.

Can you turn on some AI Max features and not others? Yes. The campaign-level toggle exposes the individual features underneath it — search term matching, URL expansion, text customization — and you can leave some off while testing others. If you’re nervous about landing page routing specifically, there’s no rule that says you have to accept Final URL Expansion just because you want broader query matching; you can disable it while keeping the rest on, though it’s worth checking that setting explicitly rather than assuming the default reflects your preference.

Does this replace Performance Max? No, they’re separate products aimed at different parts of an account, and Google has been explicit that Search campaigns with AI Max are meant to stay a distinct lane from Performance Max, not a stepping stone toward it. The overlap that does exist is at the DSA migration point: legacy Dynamic Search Ads are being folded into either AI Max-powered Search or Performance Max depending on the account, not merged into one universal campaign type.

What happens to campaigns that don’t use conversion-based bidding? They can still technically have AI Max enabled, but the core matching and expansion features won’t have much to work with, since they depend on a conversion signal to judge relevance. In practice, this means the DSA-to-AI-Max migration is going to push a lot of accounts toward conversion-based Smart Bidding whether or not they were planning to make that move on their own timeline.

Why this makes daily monitoring more important, not less

There’s a pattern in every automation Google has shipped for Search: the tools get better at finding opportunity, and the cost of not watching closely gets higher, not lower. Broad match plus Smart Bidding can find queries a human would never think to add manually — and it can also quietly drift into irrelevant territory for weeks if nobody’s checking. AI Max is the same trade at a larger scale, because it’s now making decisions about landing pages as well as queries. That’s exactly the kind of drift that’s easy to miss if you’re only logging into the account once every few weeks, and easy to catch early if something is actually watching the account every day.

That’s the specific gap Growera’s continuous account monitoring is built to close. It doesn’t replace the judgment calls in this post — nothing should, this is exactly the kind of decision that needs a person weighing tradeoffs specific to their account — but it does mean a search term report that’s worth a weekly look doesn’t quietly turn into a monthly surprise because nobody had the bandwidth to pull it. If you’re weighing how often an account like yours actually needs a human check-in, our piece on how often you should actually check your Google Ads account is a useful starting point, and it applies even more once more of your matching and routing decisions are automated.

The bottom line

AI Max for Search isn’t optional forever if Dynamic Search Ads are part of how you run your account — the migration to it is scheduled, it’s already begun for some account configurations, and it completes in February 2027 whether you’ve tested it or not. That’s a reason to get ahead of it deliberately, not a reason to panic and turn everything on today.

The feature itself is a bundle of two real mechanical changes — Search Themes for broader query matching, and Final URL Expansion for automatic landing page selection — both of which only function with conversion-based Smart Bidding underneath them. The controls that have always mattered in a Search account — negative keywords, exclusions, clean conversion tracking, a genuine habit of reading the search term report — still matter here, and arguably matter more, because the system now has more room to use them well or use them poorly.

Test it on one campaign, set your guardrails first, run a proper experiment rather than eyeballing a before-and-after, watch it closely for a full conversion cycle, and make the call based on what actually happened in your account rather than the average lift in Google’s own materials. That’s not a dramatic strategy. It’s the same one that’s worked for every other piece of Search automation Google has shipped, and there’s no reason AI Max should be the exception.