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AI Max migration changes keyword priority: protect brand and non-brand routing before cutover

AI Max migration removes exact-like priority from campaign-level broad keywords. Audit routing, add exact copies where needed, and preserve history before cutover.

The short version

Google’s September 2026 migration from campaign-level broad match to AI Max changes keyword routing. Broad keywords will no longer receive the exact-like prioritization they had under the campaign-level broad-match setting.

If an account depends on that behavior to keep brand, competitor or high-value queries in a specific campaign, add deliberate exact-match coverage before migration. Do not convert the existing broad keywords in place unless you accept losing their historical keyword statistics.

What changes in AI Max

Google’s documented prioritization order still starts with an identical exact-match keyword. Identical phrase and broad keywords, along with search themes, sit below that; AI-based relevance follows, and Ad Rank resolves equal-priority cases.

The migration-specific change is narrower but operationally important: after campaign-level broad match is disabled or migrated to AI Max, a broad keyword is no longer treated like an exact keyword for priority.

If the standard AI Max priority order is acceptable, no action is required. The risk is concentrated in accounts that used campaign-level broad match as part of their routing design.

Find campaigns that depend on the old behavior

Review Search campaigns scheduled for the September 2026 automatic upgrade. Prioritize accounts with:

  • separate brand and non-brand campaigns;
  • competitor or high-margin query partitions;
  • different budgets or bid targets for similar keyword sets;
  • campaign-level broad match enabled;
  • shared queries that can match in more than one campaign;
  • reporting that assumes a query will remain attached to its historical campaign.

For each campaign pair, record the shared query themes, current keyword match types, budget and bidding differences, negatives, conversion goals and the business reason for the routing boundary.

Do not treat campaign names as evidence. Use recent search-term data and change history to show how traffic is actually being assigned before migration.

Add exact coverage without erasing history

Where the old exact-like priority is commercially necessary, Google’s guidance is to add exact-match copies in the AI Max campaign.

Use this sequence:

  1. Export the current broad keywords and their historical statistics.
  2. Identify only the queries whose routing boundary affects budget, bidding, economics or reporting.
  3. Add exact-match copies for those terms in the intended AI Max campaign.
  4. Keep the existing broad keywords while you validate the new structure.
  5. Review negatives and campaign eligibility so the exact copy can actually serve.
  6. Confirm the intended campaign wins the query after migration.

Avoid converting the broad keyword directly to exact as a shortcut. Google says that conversion removes the keyword’s historical statistics. Preserve the original evidence before making any irreversible edit.

Do not duplicate every broad keyword automatically. Exact copies should protect a named routing requirement, not recreate a large unmanaged keyword list.

Protect brand and non-brand boundaries

Brand separation is the clearest failure mode. A brand query that moves into a broader acquisition campaign can change reported efficiency, consume a different budget and make non-brand performance look stronger than it is.

Before migration:

  • define the brand, competitor and generic query rules;
  • export a closed pre-migration search-term baseline;
  • record which campaign currently receives each material query group;
  • preserve campaign budgets, bid targets, negatives and conversion goals;
  • mark privacy-hidden search-term share as unknown rather than assigning it.

After migration, compare like-for-like closed periods. A campaign-level performance jump may be a routing change rather than an improvement in demand or conversion quality.

Verify the migrated account

Run the acceptance check after AI Max is active:

  1. Confirm the expected exact-match copies exist and are eligible.
  2. Check that the intended campaign receives the protected queries.
  3. Review search terms for leakage between brand, competitor and generic groups.
  4. Compare spend, conversions and value using the same attribution and reporting settings.
  5. Inspect budget limits and bid targets before diagnosing a routing difference.
  6. Record any negative-keyword or campaign-structure correction.

Use a full reporting interval that matches the account’s normal conversion lag. Keep the migration interval separate from the pre- and post-change comparison.

The migration is complete when material queries follow the intended budget and bidding boundary, historical evidence is preserved, and reporting notes identify the exact cutover date.

What not to conclude

AI Max migration is not evidence that broader matching improves incremental profit. It changes routing and automation behavior; performance still needs to be judged against canonical orders, refunds, margin and a suitable incrementality test.

Likewise, a lower reported CPA after migration can come from brand leakage or query reassignment. Explain the traffic mix before changing budgets or declaring an uplift.

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