Google has begun serving text advertisements from standard Search campaigns using exact and phrase match keywords inside AI Mode, a departure from the eligibility rule that had governed the surface since advertising arrived on it. Ginny Marvin, Google's Ads Liaison, described the change on September 4, 2026 as a small experiment that recently kicked off, and capped its scope to queries carrying explicit and direct user intent.

In short

Google is testing whether ordinary Search campaigns built on tightly controlled keywords can show ads inside its conversational search interface, something that previously required opting into one of its automated campaign products. It matters because exact and phrase match have functioned as the main way advertisers keep budget out of AI surfaces they did not choose. If the test holds, the choice to appear in AI Mode stops being a campaign setting and becomes a property of the query.

What Google confirmed

The change surfaced through practitioner observation rather than a product announcement. Anthony Higman, founder and chief executive of ADSQUIRE, posted on LinkedIn that Google was serving regular pure search campaigns with restrictive match types in AI mode, adding that he had confirmed the behaviour through multiple campaigns and tests on his side.

Barry Schwartz of Search Engine Roundtable published the confirmation on September 4, 2026 at 2:50 pm. According to that report, Marvin told him: "This is a small experiment that recently kicked off." Schwartz noted he reached out a second time and received confirmation that this is a new limited experiment the Google Ads team is running.

Marvin then set out the mechanics in a LinkedIn comment. "Exact and phrase match keywords are eligible to serve text ads in AI Mode," she wrote. "Note however that this is limited to cases where there is explicit and direct user intent. AI Max and PMax for Search are designed to capture complex conversational intent and access our latest ad formats (like Highlighted Answers)."

Three separate claims sit inside that paragraph. Eligibility exists. It is bounded by a query-level intent test that Google has not defined publicly. And the automated products retain exclusive access to the newer formats, which means the experiment extends reach without extending the format set.

The rule it replaces

Until this test, the route into Google's AI answer surfaces ran through automation. Google's own documentation for advertisements inside AI Overviews directed advertisers toward broad match or keywordless targeting through AI Max for Search, Performance Max, Shopping or Dynamic Search Ads, on the reasoning that triggering queries are long and exploratory. The eligibility condition for AI Mode ad experiences was documented as requiring AI Max for Search or Performance Max with text customization, which made the surface something an advertiser entered by product choice rather than by placement selection.

Higman disputed the framing that this is minor. Replying to Schwartz on X at 9:04 pm on September 4, 2026, he wrote: "But nah this one is! Others are also seeing it and it seems like they changed the rules on it now. Before this the ONLY way to show in those places was through ai max, p-max or broad and smart bidding." He added: "Thats why its a big deal! and why her NOT saying 'small test' also speaks". Schwartz had characterised the wording differently, writing that "small experiment" meaning, it is not a wide rollout.

The disagreement is about signal, not fact. Both accounts agree that the eligibility rule moved. They differ on whether the word Google chose implies a narrow pilot or a policy shift already in progress.

One nuance from earlier reporting complicates the clean before-and-after reading. Analysis published in November 2025 found that Google markets AI Max as necessary for accessing AI placements including AI Mode, despite broad match keywords being able to serve those placements without AI Max activation. The boundary was therefore always softer than the marketing suggested. What is new is that the two narrowest match types have crossed it.

Why the two narrowest match types matter

Exact match has functioned as the primary control mechanism in keyword advertising for two decades. Square brackets were the instruction that an advertisement would appear against a defined query and not against its neighbours. That instruction has been eroding for years, and the erosion is measured.

Documentation published in November 2025 showed an exact match keyword built around "hypoallergenic" triggering advertisements for thirteen queries that contained no hypoallergenic terminology, each logged in reporting as an exact match close variant. Nine months later the picture had widened. An analysis of 383 million impressions in EMEA ecommerce Search campaigns, published in late July 2026 by Mike Ryan of Smarter Ecommerce, found that the share of exact match keyword impressions that were genuinely exact had fallen to roughly 71 percent by July 2026, from at or near 100 percent through the first half of 2025. Ryan described the underlying search term matching technology as basically broad match.

Set against that trend, the September experiment reads less as an isolated test than as the next step in a sequence. The container that advertisers used to fence spend has been widening from the inside. Now the fence itself admits a new destination.

A surface with scale

AI Mode is no longer a small experiment on the consumer side. Google introduced shopping advertisements to the surface on February 11, 2026, when it was running at more than 75 million daily active users. By Google I/O 2026 the company said monthly users had passed 1 billion, with queries more than doubling every quarter since launch, searches averaging three times the length of traditional searches, and one in six queries arriving as voice or image rather than text.

Commercial density has followed. Similarweb data published in August 2026 put nearly 30 percent of ad-eligible AI Mode queries as already showing advertisements, alongside 26 percent of ChatGPT responses carrying a sponsored placement. The figures require care. Similarweb's denominator is ad-eligible queries rather than all queries, and Adthena reported United States AI Mode ad frequency of 5.8 percent on a basis the two firms have not reconciled publicly.

Whatever the true density, the direction is one-way. A surface that reached a billion users in roughly fifteen months, and that now carries commercial units on a meaningful share of eligible queries, is not a placement most search budgets can treat as marginal.

Reporting has not caught up

The operational difficulty is that Google Ads does not currently let advertisers separate AI Mode delivery from ordinary Search delivery. Similarweb's release made that point directly: a media buyer running Search, Shopping or Performance Max campaigns can serve inside a Google AI answer with no line in a report identifying it.

The measurement gap predates this experiment. Reporting from December 2025 documented that AI Max assigns traffic to exact and phrase match keyword rows when no corresponding broad match keyword exists, and that its matching relies on inferred intent rather than the literal text of a query. Marvin explained at the time that a partial query completed through autocomplete could match an exact match keyword under AI Max where standard matching would not have connected the two.

In May 2026 the search terms report itself shifted, displaying AI-interpreted intent rather than the string a user typed. Michael Hulsmann of SearchSavior framed the asymmetry in that coverage: matching keeps getting looser while negative keyword rules stay strict, so blocking a junk query lets the same intent reappear under a different reported term.

Layer the new eligibility on top and a specific problem follows. An exact match keyword row in a September 2026 account may now aggregate three distinct populations: literal matches, close variants, and AI Mode impressions. Nothing in the current reporting surface distinguishes them.

The migration running underneath

The experiment landed three days into a scheduled migration. Google emailed advertisers on August 5, 2026 confirming that campaigns running automatically created assets or the campaign-level broad match setting would convert to AI Max for Search starting September 1. Google Ads API team member Bob Hancock published the technical mechanics on August 12, 2026, confirming that creation of the legacy configurations had been switched off nine days earlier and that the automated upgrade would run across the whole of September. Dynamic Search Ads, originally bundled into the same September deadline, received an extension to February 2027.

Two movements are therefore running at once. Legacy automation settings are being folded into AI Max, and the surface AI Max was positioned to unlock is opening to campaigns that never adopted it. The second movement weakens the first as a sales argument.

Independent measurement of AI Max has run against Google's claims throughout. Testing in August 2025 found 99 percent of impressions producing zero conversions across roughly 30,000 search terms. Smarter Ecommerce analysis of more than 250 retail campaigns published on November 6, 2025 measured conversions arriving at roughly 35 percent lower return on advertising spend than traditional match types, with a four-month test by Xavier Mantica recording a cost per conversion of $100.37 against $43.97 for phrase match. Google revised its own headline claim from 14 percent more conversions at the May 2025 beta to an average of 7 percent in the April 2026 general availability announcement, measured across the full feature suite against search term matching alone and excluding retail advertisers. Invalid traffic company Lunio reported in August 2026 that AI Max carried 72 percent more invalid traffic in retail search than the comparison population.

The competitive frame

Microsoft has taken the opposite position on the same question. The company confirmed on December 18, 2025 that exact match keywords hold absolute auction priority over all other campaign types competing for the same placement, a guarantee with no Google equivalent. Microsoft then rolled its own AI Max out across all accounts globally on August 19, 2026, with brand controls shipped at launch rather than retrofitted.

Agency teams running both platforms now manage two products sharing a name, with divergent control sets and, on the evidence of September 4, divergent theories about what a restrictive match type is for.

What the confirmation does not settle

Google named no geography, no vertical restrictions, no share of accounts and no duration. The intent test that bounds eligibility, explicit and direct user intent, appears in a LinkedIn comment rather than in help documentation, which leaves advertisers without a published definition of the condition determining whether their keywords enter the surface.

Nor has Google indicated whether reporting will separate AI Mode delivery if the experiment expands. That question determines whether the change registers as new incremental reach or as a quiet reallocation of impressions already being paid for under a different label.

Higman's reading of the word choice may prove right or wrong. The observable fact is narrower and harder to dispute: the eligibility rule that made automation the price of entry to Google's fastest-growing search surface no longer holds without exception.

Timeline

Summary

Who: Google, through Ads Liaison Ginny Marvin, confirming behaviour first documented by Anthony Higman, founder and chief executive of ADSQUIRE, and reported by Barry Schwartz of Search Engine Roundtable. The change affects advertisers running standard Search campaigns built on exact and phrase match keywords, alongside agencies managing keyword-controlled account structures.

What: A limited experiment making exact and phrase match keywords eligible to serve text advertisements inside AI Mode, restricted to queries Google judges to carry explicit and direct user intent. AI Max for Search and Performance Max retain exclusive access to the newer conversational formats including Highlighted Answers. Previously, entry to Google's AI answer surfaces required broad match with automated bidding or one of the automated campaign products.

When: Confirmed on September 4, 2026, with Higman's initial LinkedIn observation posted the previous day and Marvin describing the test as recently kicked off. The confirmation arrived three days after Google began converting legacy broad match and automatically created asset campaigns to AI Max on September 1, 2026.

Where: Inside Google AI Mode, the conversational search interface Google reported at more than 1 billion monthly users by Google I/O 2026. Google specified no country, vertical or account-share scope for the experiment.

Why: Exact and phrase match have served as the mechanism by which advertisers exclude spend from surfaces they did not select. Extending eligibility to those match types removes the last structural barrier between conventional keyword campaigns and AI answer placements, at a point when independent measurement already shows literal exact match delivery at roughly 71 percent of exact match impressions and Google Ads reporting offers no way to separate AI Mode traffic from ordinary Search traffic inside a keyword row.