Google Just Upgraded Your Search Campaigns to AI Max

Another week, another surprise in Google Ads. If you opened your accounts over the last few days and felt like something was slightly different, or if performance suddenly started wandering in unexpected directions, you are certainly not imagining things.

Quietly and progressively throughout September 2026, Google has been auto-upgrading eligible Search campaigns into its new AI Max framework. And the kicker? Because it rolled out seamlessly in the background, most advertisers have not even noticed it happening.

Before you reach for the emergency biscuit tin or start frantically pausing campaigns, let’s have a proper chat. At our agency, we’ve weathered every major platform shift from the sunset of Expanded Text Ads to the dawn of Performance Max, which we covered when it landed in our guide to driving results with Performance Max. We know that a calm head, a keen eye for detail, and a smart set of guardrails are your best friends when Google flips the switches.

Here is what is actually going on under the bonnet, and the four critical areas you need to audit in your account this week.

First Off: What Is AI Max (and Did My Campaigns Get Swept Up?)

Let’s clear up the biggest misconception right away: AI Max is not a brand-new campaign type. You do not have to bid farewell to your carefully structured Search setup or resign yourself to another cross-network black box like Performance Max. That is a different discipline, and one we handle separately under Performance Max management.

Instead, AI Max is an advanced optimisation layer embedded directly inside your existing Search campaigns. Your campaigns still live purely on the Search Network (and optional Search Partners). Your ad groups, your keywords, your negative keyword lists, and your search terms reports are still right where you left them.

So, why did Google upgrade your campaigns? The September rollout specifically targets Search campaigns that were already using one of two legacy automated features:

1. Automatically Created Assets (ACA): These campaigns were upgraded with AI Max enabled, turning on both Search Term Matching and Text Customization by default.
2. Campaign-Level Broad Match: These campaigns transitioned with Search Term Matching active, while ad copy and URL automation remained switched off.

If you run standard exact, phrase, or ad-group level broad match keywords without either of those legacy toggles, your campaigns have remained untouched for now. Note that this is the campaign-level broad match setting, not individual broad match keywords sitting in your ad groups. Keyword-level broad match on its own does not trigger the upgrade.

A quick note on Dynamic Search Ads (DSA): Google originally intended to bundle legacy DSA campaigns into AI Max this month as well. However, following significant pushback from advertisers who needed more runway to test their setups, Google postponed the automatic DSA migration to February 2027. DSA campaigns can still be created and edited until then. When the February migration runs, the ability to create new DSA ad groups is removed permanently.

If your Search campaigns did get upgraded this month, here are the four settings to review immediately.

1. Search Term Matching: Check What You’re Actually Paying For

Search Term Matching is the targeting brain of AI Max. Rather than sticking rigidly to the syntax of your keyword lists, Google now uses large language models to decipher user intent, matching your ads against searches based on your keywords, ad copy, and landing pages.

In practice, this operates as a two-pronged engine: it expands your existing keywords (especially exact and phrase match) using semantic broad matching, and it introduces keywordless matching to capture queries directly related to your page content.

What to check this week:

• Head to your Search terms report. Google has introduced a brand-new match type label: “AI Max”.
• Check the Match source column to see whether an incremental query came through Broad match expansion or Keywordless matching.
• Keep an eye out for query dilution. AI Max loves casting a wide net, meaning it might suddenly enter you into loose informational queries or expensive competitor auctions you never intended to touch. Treat your negative keyword lists as your manual steering wheel: if you spot off-target queries, negative them out immediately. It is a reminder that it still pays to master keyword research even when the matching has been handed to a model.

2. Text Customization: Watch Out for the Pinning Trap

Automatically Created Assets has been formally rechristened as Text Customization. Google’s generative AI dynamically writes real-time headlines and descriptions by pulling copy from your website, your existing Responsive Search Ads (RSAs), and your wider campaign assets. You will find these newly minted assets marked as "Google AI" in the Added by column of your Asset reports. It is the biggest change to ad copy control in years, and we keep a running note on what’s new in paid search.

While tailored copy sounds great on paper, it introduces two huge operational risks: hallucinated claims and broken asset pins.

The Pinning Conflict: If you work in a regulated industry, such as finance, legal, or healthcare, or you simply have strict brand rules, you probably rely on pinned RSA headlines for mandatory legal disclaimers or company names.

Here is the trap: If Final URL Expansion is enabled, Google may bypass your pinned RSA assets entirely. When the system selects an alternative landing page it deems more relevant, it omits pinned copy that might clash with that new page. If your business legally requires specific disclaimers to appear on every impression, you must either turn off Final URL Expansion or translate those rules into Text Guidelines.

What to check this week:

• Review generated copy in your Asset Report to ensure the AI hasn’t concocted promises, discounts, or tone-deaf phrases you cannot support.
• Set up Text Guidelines under your AI Max campaign settings. You get up to 25 Term Exclusions (exact words to ban, such as competitor names or unapproved words like “cure” or “cheapest”), capped at 30 characters each, and up to 40 Messaging Restrictions (plain-English rules, like “Don’t generate assets containing prices” or “Never use clinical language”), capped at 300 characters each.
• Be aware of the difference between the two. Term exclusions are language specific, so a word you block in English will not be blocked in its translated form. Messaging restrictions apply semantically across all of a campaign’s languages, which makes them the better tool for anything that has to hold everywhere. Term exclusions also cannot stop prices appearing in generated assets, so use a messaging restriction for that.

3. Final URL Expansion: Stop Traffic Landing on the Wrong Pages

Final URL Expansion gives Google permission to swap out the landing page you manually designated in your ad for any page on your website it believes will convert better for that specific query.

The risk? Google’s algorithm optimises for immediate textual relevance, not necessarily your commercial bottom line. Without guardrails, paid clicks can end up routed to your /blog/, your /careers/ portal, your privacy policy, or out-of-stock product pages. If Google is picking your landing pages, the quality of your landing page design stops being a nice-to-have.

What to check this week:

• Navigate to the Landing pages report and check the “Selected by” column. Filter for pages dynamically chosen by AI Max.
• If you see paid budget flowing into informational pages, immediately add URL Exclusions under your AI Max campaign settings. Exclude non-converting directory rules (e.g., URLs containing /blog/ or /about/), then put the recovered budget behind proper conversion rate optimisation on the pages you do want traffic hitting.
• Verify tracking parameters. Ensure that your dynamic URLs are not stripping CRM tracking tokens or ValueTrack parameters ({matchtype}, {keyword}) through unexpected CMS redirects. This is where Google Tag Manager for PPC tracking earns its keep, and if you have moved to server-side tracking, check the handoff there too.

4. Brand Controls: Protect Your Margins from Cannibalisation

When machine-learning models are instructed to hunt down incremental conversions, they quickly sniff out low-hanging fruit: your own brand name.

If your newly upgraded AI Max non-brand campaign begins serving for your own brand searches, your campaign metrics might look artificially fantastic. In reality, all you’ve done is pay inflated, non-brand auction prices for existing brand traffic that your dedicated brand campaign could have captured for pennies. We have written before about the benefits of own brand bidding, and the whole argument rests on that traffic staying cheap.

What to check this week:

• Open your AI Max settings and review the Brands section.
• Apply a Brand Exclusion list containing your brand names and common misspellings to all non-brand discovery campaigns. This creates a firm boundary, ensuring your AI Max campaigns focus strictly on genuine customer acquisition.
• Remember the configuration hierarchy: ad-group level brand inclusions will override campaign-level brand settings. Make sure individual ad group settings haven’t overridden your top-level safeguards.

Don’t Panic, Just Steer the Ship

An unexpected Google update doesn’t mean your paid search strategy is broken; it just means the playing field has shifted.

AI Max is capable of driving meaningful incremental volume when fed clear data, but it requires human oversight to stop it from drifting off-course. Take thirty minutes this week to inspect your match types, enforce your Text Guidelines, lock down your landing pages, and ring-fence your brand.

When you keep a firm hand on the steering wheel, automation becomes a genuine asset rather than an unguided budget drain. If you would rather someone went through it properly, a PPC account audit will tell you exactly what the upgrade has changed in your account.

Get in touch with Platform81 and our paid media team will take a look.