September is the deadline. AI Brief is (hopefully) the answer.

September is the deadline. AI Brief is (hopefully) the answer.

One of the biggest announcements at Google Marketing Live 2026 wasn't a flashy ad format or a new YouTube placement; it was a text box asking you to describe your brand in plain language. AI Brief, launched as part of AI Max for Search, is Google's natural-language interface for telling its Gemini-powered systems what your brand is, who you're talking to, and where your ads should or shouldn't show up. A new type of steering wheel, as we're previously used to audience, keywords and search themes for steering.

In September 2026, Google sunsets Dynamic Search Ads, and Campaign-level broad match and Automatically Created Assets follow shortly after. All three get auto-upgraded into AI Max, with Google's most aggressive default settings switched on. Google mentioned AI Brief is getting rolled out in the coming months, so let's hope we all get access in time.

From keywords to intent

For two decades, paid search was deterministic. Media buyers mapped exact and phrase match keywords to specific ads and landing pages. Advertisers controlled the inputs, Google controlled the auction, and everyone agreed on the rules.

That model has slowly deteriorated over time as more and more levers have been stripped away from the advertisers, and AI Max appears as a final boss of automation. Instead of keywords, you give the system a brand, a landing page, some creative, and some sense of who you want to reach. Gemini then interprets each individual query and builds an ad from your asset pool. Google's own claim is a 14% conversion lift versus legacy campaign structures, rising to 27% for campaigns that previously leaned heavily on exact and phrase match.

Independent data tells a more cautious story. We’ve seen increased volumes, but also increased inefficiencies. Sometimes it works OK, sometimes not so OK, and it's not easy to understand why the results differ so much. It's essentially a roll of the dice.

AI Max delivers volume, but the efficiency outcome depends almost entirely on the quality of the inputs you give it. But, hopefully, this is the exact problem AI Brief is built to solve.

What AI Brief actually does

AI Brief is a conversational layer on top of AI Max. Instead of expanding a massive negative keyword list, you describe your brand to the AI the way you'd brief a media planner. Google has built this around three types of guidance:

• Messaging guidelines tell the AI what your ads should and shouldn't say. Things like "never mention prices," or "always reference our 30-day return policy," or "don't use slang, exclamation marks, or caps-lock emphasis."
• Matching guidelines tell the AI which search intents to chase and which to skip. An online education provider can instruct the system to "avoid searches for in-person degree programs." These rules get interpreted semantically, so one instruction blocks an entire intent space rather than a long list of literal keywords.
• Audience guidelines describe the people you actually want to reach. "For health-conscious shoppers, emphasize our clean ingredient list." This guides creative assembly toward the psychographic profile you care about, instead of leaving the AI to infer it from raw conversion signals.

Before the campaign goes live, you see preview assets and the kinds of searches the system plans to target, with the option to edit your brief before committing. The most predictable configuration mistake is writing vague positive instructions. "Keep it professional" is uninterpretable. "Don't use slang, exclamation marks, or caps-lock emphasis" is easy to understand and to act on. Be specific.

The compliance unlock

There's a quieter change worth flagging for anyone working with regulated industries. Alongside AI Brief, Google launched Text Disclaimers, which guarantee that legally required language always serves in the first description line of every generated ad, regardless of what Final URL Expansion does to the landing page. For Nordic banks, insurance providers, and pharma brands, it's the difference between using AI Max at all and locking it out entirely.

Before this, regulated advertisers had to pick one of two bad options. Either enable Final URL Expansion and risk serving ads without mandatory disclosures, or disable it and forfeit the AI's intent-matching reach. Text Disclaimers remove the dilemma.

The agency shift, eventually

The deeper change AI Brief signals is what it does to the work itself. Execution is becoming a commodity as the hours an agency once spent building exhaustive keyword lists, writing many different ad variants, and testing landing pages are getting absorbed by the model. What replaces them is upstream work: writing the brief, structuring the data pipeline, configuring guardrails, auditing what the AI generates and trying to predict how AI will behave in certain scenarios.

That said, we're not fully there yet. AI Max in its current form is too inconsistent for us to confidently say "the future of SEM is just writing briefs." Right now, the upstream work matters precisely because the downstream behaviour is unpredictable. AI Brief is a step toward a world where the algorithm does the heavy lifting reliably, but the wins still come from people who understand both the brief and the campaign mechanics underneath it. The transition and destination are real, but anyone betting their workflow entirely on AI Max today is in for a rough time.

What to do before September

Run A/B experiments on mid-volume campaigns through May, June and July. Voluntarily upgrade high-spend campaigns in July or August, with the AI Brief configured before launch, not after. By late August, do a final compliance audit. By September, you should be on AI Max by choice, not by default.

The window between now and September is the difference between writing your own brief and inheriting Google's. For any account that matters, that's the work to prioritize this summer.