TL;DR: Google’s AI ad stack is three products, not one. AI Max adds keywordless matching to Search. Performance Max buys every channel from one campaign. Demand Gen handles YouTube and Discover. Google reports a 14% conversion lift for AI Max. Start there, because campaign-level broad match auto-upgrades in September 2026.
The three products, and what each one controls
Google markets one AI story. Under that story sit three separate products with three different jobs.
AI Max is a setting inside a standard Search campaign. Performance Max is its own campaign type that buys every Google surface at once. Demand Gen is a paid social style campaign for YouTube, Shorts, Discover, and Gmail.
Confusing them is the most expensive mistake we find in new accounts. An advertiser moves budget into Performance Max to “do AI,” then loses the keyword control that was making Search profitable.
| Product | What it is | Where ads run | What you still control | Best use |
|---|---|---|---|---|
| AI Max for Search | A setting inside an existing Search campaign | Google Search | Keywords, negatives, brand inclusions and exclusions, URL exclusions | Capturing demand your keyword list misses |
| Performance Max | A separate campaign type | Search, YouTube, Display, Discover, Gmail, and Maps | Budget, goals, feeds, assets, brand exclusions, negatives at account or campaign level | Retail feeds and broad conversion volume |
| Demand Gen | A separate campaign type | YouTube, Shorts, Discover, and Gmail | Audiences, creative, placements, bidding goal | Creating demand before anyone searches |
That table is the short answer. The detail matters more, because each product fails in a different way. Our AI in PPC playbook covers the full account structure. This piece covers what each product actually does.
AI Max for Search, explained
Google announced AI Max at Google Marketing Live on May 6, 2025. It is a checkbox, not a campaign type. You switch it on inside a Search campaign you already run, and your keywords stay in place.
What the checkbox turns on
- Search term matching: keywordless matching runs next to your keywords and finds queries your list never covered.
- Text customization: Google writes new headlines and descriptions from your landing pages, your existing ads, and your keywords.
- Final URL expansion: traffic gets routed to the page Google picks, not the page you picked.
- Brand controls and locations of interest: you can require or exclude specific brands, and target by the location a searcher cares about, at ad group level.
What Google’s numbers actually measure
Google reports that advertisers who activate AI Max typically see 14% more conversions or conversion value at a similar CPA or ROAS. For campaigns still built mostly on exact and phrase match, the reported lift is 27%. In Google’s own case study, L’Oréal recorded a 2x higher conversion rate at a 31% lower cost per conversion.
Read the 27% figure carefully. It comes from accounts with the tightest keyword lists, which had the most unserved demand sitting outside those keywords. If you already run broad match with Smart Bidding, plan around the smaller number.
Where AI Max leaks money
Final URL expansion is the first leak. On a law firm account, it will happily send a “truck accident lawyer” click to a general practice-areas page that converts at half the rate. Exclude the URLs you do not want served, or switch expansion off while you test.
Text customization is the second. It pulls copy from your site, so a stale pricing page or an outdated offer can end up in a live headline. Check the asset report weekly for the first month.
Negative keywords still work. Brand exclusions still work. Use both on day one instead of waiting for the search terms report to fill with competitor names.
Performance Max, explained
Performance Max reaches Google’s full inventory from a single campaign: Search, YouTube, Display, Discover, Gmail, and Maps. You supply goals, budget, assets, audience signals, and a product feed. Google decides the rest.
Google’s help documentation reports that advertisers beyond retail who adopt Performance Max see an average increase of 27% more conversions or value at a similar CPA or ROAS, measured against accounts already using broad match and Smart Bidding in Search.
Adoption is real, and it is no longer growing in a straight line. Tinuiti’s Q2 2026 benchmark data shows Performance Max accounted for 60% of spending across Google Shopping and PMax campaigns among advertisers running both, down from 67% in Q1 2026. Advertisers are pulling budget back toward standard Shopping where it performs.
What moves Performance Max performance
Creative and data quality do the heavy lifting. Google reports advertisers who include at least one video see an average of 12% total additional conversions. Advertisers using New Customer Value mode improved ROAS by 9%, improved their new customer ratio by 5%, and cut new customer acquisition cost by 7%.
Reporting improved through 2025. Manager accounts now get channel-level performance reporting, full search terms reporting, and asset-level impressions, clicks, and cost. The old complaint that PMax is a black box is weaker than it was two years ago.
Demand Gen, explained
Demand Gen is the only one of the three that creates demand instead of capturing it. It runs on YouTube, Shorts, Discover, and Gmail, and it is built to be judged the way you judge Meta: creative first, audience second, last-click attribution last.
Google reports Demand Gen delivered a 26% increase in conversions per dollar over the prior year, driven by more than 60 AI improvements to ramp time and bidding. Tinuiti’s Q2 2026 data shows Demand Gen spend up 12% year over year with impressions up 22%.
The measurement trap is obvious once you name it. Demand Gen fills the top of the funnel, so a last-click report will always make it look worse than Search. Track view-through conversions and branded search volume alongside direct conversions before you decide it failed. If you already run Meta, the logic will feel familiar. We break the parallel down in our explainer on Meta’s AI ads stack, Advantage+ and the Andromeda algorithm.
The reported lifts, side by side
Four numbers get quoted constantly, and they measure four different things. Here they are together.
None of these are guarantees. Every figure is Google’s internal data, measured against a baseline Google selected. Treat them as direction, not as a forecast for your account.
How to split budget across the three
Start with the job each product does. Search intent is the cheapest conversion you will ever buy, so protect it first. AI Max belongs on Search campaigns that have run out of keyword headroom, not on a brand campaign that already converts at a 20% rate.
Performance Max earns budget when you have a clean feed, a real conversion signal, and enough volume for the model to learn. Demand Gen earns budget when Search is capped and you need more people looking for you next month.
One more input belongs in this decision. AI Overviews are changing which queries produce clicks at all, which changes what your keyword list is worth. We cover the measured effects in our breakdown of AI Overviews and paid search.
The September 2026 deadline
This part is not optional. Google is migrating legacy Search features into AI Max on a published timeline.
Search Engine Land reported on June 12, 2026 that Google delayed the Dynamic Search Ads portion after advertiser pushback. The campaign-level broad match and automatically created assets migration held its September 2026 date. DSA campaigns now move in February 2027, with reminder notices in January.
The practical read: if a campaign uses campaign-level broad match or automatically created assets, it is being upgraded this month whether or not you planned for it. Auditing those campaigns before the switch is cheaper than diagnosing a CPA spike after it.
What none of this automates away
Google’s AI decides matching, bidding, placement, and increasingly the copy. It does not decide your offer, your landing page, your conversion tracking quality, or which conversions are worth paying for.
That is where account performance is actually won now. Feed the model accurate revenue data and it gets sharper. Feed it a form fill that includes spam and it optimizes toward spam, efficiently. We wrote about where that leaves agencies in will AI replace PPC agencies, and the honest answer is narrower than either side claims.
Our AI PPC management practice is built around those inputs: conversion data quality, exclusion hygiene, creative volume, and knowing which of these three products a given account should not be running.
Get a written read on your AI settings before the migration
If AI Max, Performance Max, or Demand Gen is running in your account right now, you should know exactly which controls are on and what each one is costing you.
We will audit it and send you a written document: which settings are live, where budget is going to the wrong surface, and what to change before the September migration. No call required to get the findings.
Related on iClick
Sources
- Google Ads & Commerce Blog: AI Max for Search campaigns announcement (May 6, 2025)
- Google Ads Help: About AI Max for Search campaigns
- Google Ads Help: Multiply conversions with Performance Max
- Google Ads Help: Google Ads Highlights of 2025 (Demand Gen conversions per dollar)
- Search Engine Land: Google delays Dynamic Search Ads migration to AI Max (June 12, 2026)
- Google Ads & Commerce Blog: Dynamic Search Ads are upgrading to AI Max
- Karooya: Tinuiti Digital Ads Benchmark Report Q2 2026 highlights (August 11, 2026)
Frequently asked questions
What is the difference between AI Max and Performance Max?
AI Max is a setting you turn on inside an existing Search campaign, and your keywords stay in place. Performance Max is a separate campaign type that buys Search, YouTube, Display, Discover, Gmail, and Maps from one budget. AI Max keeps Search control. Performance Max trades that control for reach across every Google surface.
Is AI Max worth turning on if I already use broad match?
The upside is smaller. Google reports a typical 14% conversion lift, rising to 27% for campaigns still built mostly on exact and phrase match. Those tighter accounts had more unserved demand outside their keywords. If you already run broad match with Smart Bidding, plan around the lower figure and test in one campaign first.
When does Google force campaigns onto AI Max?
Campaign-level broad match and automatically created assets migrate to AI Max in September 2026. Google stopped allowing new setups of both on August 3, 2026. Dynamic Search Ads were delayed after advertiser feedback and now migrate in February 2027, with reminder notifications in January 2027.
Should I judge Demand Gen on last-click conversions?
No. Demand Gen runs on YouTube, Shorts, Discover, and Gmail, where people are not searching yet. Last-click reporting will always undercount it. Track view-through conversions, branded search volume, and assisted conversions alongside direct results. Google reports a 26% year over year improvement in conversions per dollar for the product.
Which AI Max setting causes the most problems?
Final URL expansion. It routes clicks to whichever page Google thinks fits the query, which often means a general page instead of the converting one you built. Exclude the URLs you do not want served, or leave expansion off during your first test window, then check the search terms and asset reports weekly.
