After AI Max Turns On: Which Settings Should You Keep or Constrain?

Keep AI Max on only for the Search features your account can supervise. Constrain or disable search term matching, text customization, and Final URL expansion when conversion tracking, landing-page quality, brand controls, tracking templates, or budget headroom are not ready. Google Ads treats AI Max as an optimization layer inside Search campaigns—not a separate campaign type—and newer Search campaigns often have it enabled by default. This article gives you a Control Ladder, a Readiness Scorecard, and a staged rollout you can apply before you accept every default toggle.

Bottom line: AI Max can expand reach and creative relevance when foundations are sound. It can also send traffic to weak pages, rewrite messaging you cannot defend, or dilute diagnostics when measurement is incomplete. Decide feature by feature—not with a single on/off panic switch.

What AI Max actually changes

According to Google Ads Help on AI Max for Search campaigns, AI Max adds targeting and creative enhancements inside existing Search campaigns: improved search term matching, text customization of headlines and descriptions, and Final URL expansion to a more relevant page on your domain. Google states that AI Max is not a new campaign type.

Google’s guide to how AI Max works splits the suite into two main areas:

• Search term matching expands beyond your existing keywords using broad match and keywordless technology, with ad group-level control.

• Asset optimization covers text customization and Final URL expansion at the campaign level. Final URL expansion requires text customization, and Google notes that pinned responsive search ad assets are not respected when Final URL expansion (or URL inclusions) is on.

Google also reports that advertisers activating AI Max in Search campaigns typically see about 14% more conversions or conversion value at a similar CPA or ROAS, based on Google internal data from 2025 for non-retail advertisers. Treat that as Google’s published directional claim—not a guaranteed result for your account.

Timing matters for operators. Google’s text customization documentation states that, starting in September 2026, campaigns using text customization (formerly automatically created assets) are automatically upgraded to AI Max. Google’s setup guide also notes that new Search campaigns have AI Max turned on by default. Many teams are no longer debating “whether to try AI Max.” They are deciding which defaults to keep.

AI Max Control Ladder

Use this ladder to separate “AI Max is present” from “every AI Max lever should run wide open.” Climb only when the previous level is stable.

Google’s tip in the setup documentation is clear: full benefits typically require both search term matching and asset optimization. That tip is useful only after you can supervise the side effects. Climbing to L4 before L0–L3 foundations are real usually creates more cleanup than growth.

AI Max Readiness Scorecard

Score each factor from 0 to 2. Total ranges from 0 to 12.

Interpretation:

• 0–5: Stay at L0 or L1. Fix measurement, pages, and templates before expanding matching or destinations.

• 6–8: Run L1 or L2 on one proven campaign. Keep Final URL expansion off until destination governance scores a 2.

• 9–12: Candidate for L3 or L4. Enable expansion deliberately, then judge results with AI Max match-source and landing-page reporting—not vanity impression gains.

Hard prerequisites Google documents

Three constraints show up repeatedly in Google’s help pages and should stop a reckless full-suite enablement:

1. Smart Bidding signals matter. Google’s setup guidance states that features like search term matching, Final URL expansion, and text customization require conversion-based Smart Bidding strategies to function effectively. The FAQ is more explicit for Manual CPC: search term matching does not work with Manual CPC because AI Max relies on automated bidding signals such as Maximize Conversions or Maximize Conversion Value.

2. Budget limits blunt AI Max. Google notes that AI Max will not be effective if campaigns are limited by budget, and an alert can appear when AI Max is turned on under that condition.

3. Dynamic landing pages can break tracking. Google warns that Final URL expansion with incompatible tracking templates can produce broken expanded landing pages, including 404 errors. Supported patterns include {lpurl}?, {lpurl}&, {lpurl}#, and {lpurl} with no trailing parameters. Static tracking URLs without {lpurl} can override the dynamic page.

Also useful: Google’s AI Max FAQ confirms that negative keywords are still respected when AI Max is on. That does not mean negatives are optional. Expanded matching makes a maintained negative list more important, not less.

Worked example: home-services Search account

Consider a hypothetical regional HVAC company with Search campaigns for emergency repair, maintenance plans, and brand. Conversion tracking records booked appointments, but sales-qualified jobs only sync nightly. Two landing pages are excellent. Several blog posts still claim seasonal discounts that expired. Tracking uses a third-party template with {lpurl}.

Scorecard snapshot:

• Bidding: 1 — Maximize Conversions is on, but the counted conversion is still soft.

• Landing-page quality: 1 — core offer pages are strong; blogs are risky source text.

• Destination governance: 0 — no URL exclusions yet.

• Tracking compatibility: 2 — {lpurl} pattern already validated.

• Brand/compliance: 1 — negatives exist; text guidelines do not.

• Budget/review: 1 — maintenance campaign has headroom; emergency campaign is often limited.

Total: 6. Recommended path: L1 on the maintenance campaign only. Turn on text customization with exclusions for expired discount language. Leave Final URL expansion off until blog and soft pages are excluded. Keep search term matching off on emergency until negatives for DIY and job-seeker queries are refreshed. Do not jump to L4 account-wide because one Google default toggle appeared.

Common failure patterns

• Treating AI Max as a campaign type decision. That confuses this choice with Search versus Performance Max. AI Max changes how an existing Search campaign matches, writes, and lands traffic.

• Leaving Final URL expansion on while pinning compliance headlines. Google documents that pinned RSA assets are not respected when Final URL expansion or URL inclusions are enabled.

• Enabling text customization on inaccurate pages. Google’s text customization guidance says generative and extractive assets are grounded in your landing-page content. Weak pages produce weak ads at scale.

• Expecting AI Max to rescue a budget-capped campaign. Google states AI Max is not effective when the campaign is limited by budget.

• Turning AI Max off without checking dependent controls. Google’s FAQ notes that turning AI Max off disables the suite of features managed inside it, including brand exclusions configured there.

What to do next

1. Inventory each Search campaign’s AI Max state: search term matching, text customization, Final URL expansion, URL rules, and brand lists.

2. Score the campaign with the Readiness Scorecard before changing any toggle.

3. Choose one Control Ladder level and one campaign for the first change—not every campaign at once.

4. If you enable text customization, add text guidelines for restricted claims and review asset previews where available.

5. If you enable Final URL expansion, verify tracking templates and add URL exclusions for non-commercial or policy-sensitive pages first.

6. After the change, review AI Max match sources, landing pages selected by AI Max, and customized assets against conversion quality—not clicks alone.

If your team needs help auditing Search structure, conversion integrity, and AI Max governance inside a broader paid program, Oasbit’s digital advertising services are built for that kind of measurement-first media work. Related reading: Search ads first or Performance Max and which bid strategy to use first.

If you want a practical review of which AI Max settings your account should keep, constrain, or disable before the next spend increase, book an Oasbit growth strategy session.

Sources

• About AI Max for Search campaigns — Google Ads Help

• How AI Max for Search campaigns works — Google Ads Help

• Set up AI Max for Search campaigns — Google Ads Help

• Frequently asked questions about AI Max for Search campaigns — Google Ads Help

• About text customization in Search campaigns — Google Ads Help

• Turn text customization on or off in Search campaigns — Google Ads Help

• Use text guidelines with Performance Max and Search campaigns — Google Ads Help