For two decades, buying an ad on Google's search engine worked much like placing an order. Advertisers chose the words they wanted their ads to appear beside, wrote the ads themselves and picked the web page where customers would land.

Google is now taking much of that work for itself.

Google has spent the past few months quietly moving advertisers' Search campaigns into AI Max, its AI-driven automation layer, whether or not they asked to go. Campaigns using automatically created assets or the campaign-level broad match setting were upgraded automatically between September 1 and 30, 2026. Dynamic Search Ads follow in February 2027.

Google says your existing settings carry over. They mostly do. But the rules your campaign now plays by are different, and the advice from practitioners is unanimous: open your search term report and keep it open.

This is not just a settings change. It is a change in who is driving.

The move is one of the clearest signs yet of a broader shift in digital advertising. The largest platforms are steadily removing the manual controls that marketers once used to manage their spending, and asking them to trust automated systems instead.

Google says the change will pay off. When it announced the plan in April, the company said campaigns using all three of AI Max's features had produced, on average, 7 percent more conversions, such as sales or sign-ups, at a similar cost, compared with campaigns using only one of them.

What Google AI Max is:

A layer of automation sitting on top of a normal Google Search campaign. Traditionally you told Google exactly which keywords to bid on, wrote the ads yourself, and chose the landing page. AI Max hands those three decisions to Google’s AI:

  1. Search term matching: Google decides which searches your ad shows for, reading intent and your site content rather than sticking strictly to your keyword list.

  2. Text customization: Google writes or rewrites headlines and descriptions based on your landing pages and assets.

  3. Final URL expansion: Google picks which page on your site to send each searcher to.

What the “shift” is: Google is phasing out three older features and folding them into AI Max. The affected legacy setups are Dynamic Search Ads, automatically created assets (ACA), and the campaign-level broad match setting. Automatic migration of the ACA and broad match campaigns ran from September 1 to 30. Dynamic Search Ads got a five-month extension to February 2027 after advertisers raised concerns about Q4 planning risk.

The search term report is now the most important screen in your account

When you choose the keywords, the keyword list tells you what you are buying. When Google chooses, the keyword list tells you what you hoped to buy. The search term report tells you what you actually bought.

That gap is where money leaks. Ads start showing for competitor names, for loosely related questions, for people researching rather than purchasing. None of it is malicious. A model optimising for conversions will happily find cheap ones that do not turn into revenue.

Google has started adding visibility here. In mid-October, a new search terms and ad combinations report began appearing in some AI Max accounts, showing which query triggered which generated headline and landing page. Use it. If text customization is on, also read what Google is writing in your name. An AI-generated headline that overpromises is still your headline.

Social listener have urges a little caution. Under AI Max, ads can appear for searches an advertiser never chose, and the burden of spotting costly mismatches could fall largely on the advertiser.

The bigger pattern: the levers are leaving

Google is not alone. On October 1, Microsoft Advertising stopped offering a maximum CPC cap when advertisers create new campaigns on automated bidding strategies such as Target CPA and Maximize Conversions. Across platforms, manual controls are turning into guardrails, and guardrails are turning into suggestions.

Google's case for this is simple. It says AI Max campaigns using all three features see an average of 7% more conversions or conversion value at a similar CPA or ROAS than those using search term matching alone. That figure may well be true on average. But averages are where the platform lives, and your business lives at the margins.

There is a behavioural point worth making here. Automation tends to optimise for what is easy to measure, and the easiest thing to measure is the click or the form fill that happens quickly.

The value of a brand often sits in what is slow, awkward and hard to attribute: the buyer who searched three times over six weeks before talking to sales. A system rewarded for cheap conversions will, quite rationally, learn to ignore that buyer. Nobody designed it to be short-sighted. It simply learned what it was paid for.

 

For advertisers, the practical upshot is that managing search ads is becoming less about issuing instructions and more about supervising a machine: deciding what data to give it, which results to count as success and when to overrule it.

Sources