AI Max doesn't exist in isolation. Most advertisers introducing it already run Search campaigns, Performance Max, or both. The real question isn't what AI Max is. It's how those channels behave together.

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Search has gradually become more automated over the past few years. Dynamic Search Ads, broad match, Automatically Created Assets and now AI Max have all expanded Google's role in deciding which queries, ads and landing pages are used. The obvious question is whether AI Max changes the role of traditional Search campaigns and Performance Max, or simply complements them.

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What AI Max Actually Is

AI Max is not a new campaign type. It is a feature set layered on top of existing Search campaigns, bundling three functions: search term matching (expanded query coverage beyond your keyword list), text customization (formerly automatically created assets), and final URL expansion. Each can be toggled individually and not all campaigns will want all three active at once.

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Google claims advertisers who activate AI Max typically see around 14% more conversions at a similar CPA (Google internal data, 2025, non-retail advertisers globally). Aggregate averages hide enormous variance. What matters is whether expansion is genuinely incremental or simply reshuffling impressions you were already capturing.

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Three Channels, One Auction

When AI Max-enabled Search and Performance Max are both eligible for the same query, Ad Rank determines which serves. The two channels can and do compete for the same inventory within the same account, which makes monitoring overlap non-negotiable.

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For Dynamic Search Ads, the situation is more straightforward: they are being retired. From February 2027, all DSA campaigns will be automatically upgraded to AI Max. The migration is not optional, and if you do not act proactively, Google will apply default settings that may not match your current structure.

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What We Observed in Some Active Accounts

We ran an early analysis on a travel platform account in May 2026. The findings below are directional, but they point to some patterns worth paying attention to.

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Channel overlap: While Search and Performance Max mostly served different queries, the relatively small overlapping segment generated a disproportionately large share of clicks and conversions, which drove close to half of total clicks and conversions, at the highest CVR of any segment. The pattern suggests complementary demand capture, not cannibalization.

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AI Max reach: AI Max introduced genuinely new search terms that had not appeared in either Search or Performance Max during the previous seven months. The rest were reactivations of terms previously served under broad match or close variants. That said, a closer look at the new queries revealed mixed quality, some were too generic, others semantically distant from the core offering, and others simply not relevant to the business. Incremental reach is only valuable if the queries themselves are.

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Spend distribution: The overlapping segment was the most efficient, concentrating roughly half of total conversions while representing a similar share of spend. AI Max, still in its early learning phase, accounted for a small fraction of overall budget allocation.

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The Practical Takeaway

Running Search, PMax, and AI Max simultaneously is not inherently problematic, but it requires active monitoring. The overlapping query segment is where both the most value and the most risk concentrate. High-intent queries convert well, but if multiple channels are serving on the same ones, you may be spending budget twice on the same demand without meaningfully increasing incremental reach.

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On AI Max specifically: a meaningful share of its queries were genuinely new, which suggests expansion is finding real territory. But new queries are not automatically good queries, and the conversion volume in the account analysed is still too low to evaluate efficiency with confidence. In practice, Performance Max continues to drive significantly more query and volume discovery at this stage. AI Max is a learning-phase feature, and should be treated as one.

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The extra time Google has given with the February 2027 deadline is useful, but it is not a reason to wait. Proactive migration gives you control over which settings are active and how the structure maps onto your existing campaigns, rather than inheriting whatever Google applies by default when the deadline arrives.

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