Criteo today published a June 2026 update on its OpenAI integration, disclosing that more than 2,000 brands are now advertising on ChatGPT through its platform - doubling the milestone it reported in early May - while rolling out a new creative capability called Prompt Smart Ads and expanding access to three additional countries.

The update, published by Criteo in June 2026, marks the latest in a series of disclosures the Paris-headquartered commerce media company has made since becoming OpenAI's first advertising technology partner when the partnership was announced on March 2, 2026. The scale of the advertiser count - 2,000 brands now live - is notable. When Criteo published its previous update on May 5, 2026, the number stood at just over one thousand. The doubling in under two months suggests the integration is adding participants at pace, drawing both existing Criteo clients and advertisers who had no prior relationship with the platform.

Geographic expansion reaches the UK, Japan and South Korea

The geographic footprint of Criteo's ChatGPT Ads access has expanded significantly. According to Criteo, advertisers in the United Kingdom, Japan, and South Korea can now access ChatGPT Ads inventory through the platform. That follows earlier rollouts in the United States, Australia, Canada, and New Zealand. Seven countries are now live, spanning North America, the Pacific, and major markets in Europe and Asia.

The speed of that geographic spread matters. When Criteo's ChatGPT partnership first launched in March 2026, access was limited to the United States alone. OpenAI announced the expansion to Australia, Canada, and New Zealand in late March 2026, coinciding with the disclosure that the ChatGPT ad pilot had crossed $100 million in annualized revenue within six weeks of launch. The UK, Japan, and South Korea now bring in markets with substantially different digital advertising cultures, regulatory environments, and consumer behaviors - a test of whether the conversational ad format translates across linguistic and cultural contexts beyond its English-language origin.

According to Criteo, advertiser growth in the UK, Japan, and South Korea is continuing week over week. The company characterizes the trajectory as reflecting "growing global demand for advertising opportunities within conversational AI experiences," though the underlying numbers behind that week-over-week growth are not disclosed in the update.

Category breakdown: which verticals are running ads

Criteo's June 2026 update provides the most specific category data it has published about ChatGPT Ads activity to date. According to Criteo, the five leading categories running ads in ChatGPT through the platform are apparel, home furnishings, consumer electronics, automotive, and beauty.

The presence of automotive alongside the more expected retail categories is worth examining. Automotive purchases sit at the complex, high-consideration end of the consumer purchase funnel - the kind of decision where extended research and comparison are typical. That category's appearance in the top five suggests advertisers are testing ChatGPT not solely as a direct-response channel for lower-commitment purchases, but as a surface for early-funnel consideration work. Whether automotive ad performance data will validate that hypothesis is not addressed in the current disclosure.

Apparel and beauty, by contrast, represent frequent, relatively lower-consideration purchases where consumers are likely to move from discovery to transaction more rapidly. Home furnishings sits somewhere in the middle. The breadth across these five categories indicates advertisers are applying the channel across multiple stages of the purchase journey, rather than confining it to a single use case.

Prompt Smart Ads: how the creative capability works

The most technically significant new element in Criteo's June 2026 update is Prompt Smart Ads, a creative capability designed specifically for the mechanics of conversational AI advertising. The announcement describes it as a system that "automatically generates optimized ad creatives and product descriptions tailored to the context of a consumer's query."

The technical inputs are three distinct data layers. First, catalog data - the structured product information a retailer or brand maintains, typically including product names, descriptions, prices, images, and availability. Second, commerce intelligence - Criteo's proprietary behavioral and transactional signals drawn from its network, which according to the company covers 740 million daily shoppers, $1 trillion in annual transactions, and 5 billion product SKUs. Third, prompt-level insights - an input that is specific to the conversational context. This third layer is what distinguishes the Prompt Smart Ads mechanism from a standard dynamic creative system. By incorporating the actual content and intent of the consumer's query, the system adapts both the product selection and the description text to match what the user is actively asking about.

The practical significance of that third layer comes down to a specific challenge in conversational advertising. A standard ad served into a search results page can match keywords. An ad served inside a ChatGPT conversation needs to be relevant not to a keyword but to the semantic meaning, tone, and stage of a dialogue. A consumer asking "I'm looking for a comfortable sofa that works in a small apartment" is expressing a constraint, a category, and an implied aesthetic preference simultaneously. A static product description that ignores those nuances is likely to feel out of place in the conversation flow. Prompt Smart Ads, as described by Criteo, is designed to address precisely that mismatch - though the mechanism by which it accesses and processes the prompt-level signal is not detailed in the current disclosure.

The performance claim attached to Prompt Smart Ads is specific. According to Criteo, early testing shows that ad campaigns in ChatGPT using the capability generate approximately 4x higher spend after activation. The company frames this as helping advertisers "improve campaign delivery, complete budgets more efficiently, and scale investment within ChatGPT." The metric being cited is spend after activation, not conversion rate or return on investment. That framing implies the primary effect Criteo is measuring is how quickly advertisers exhaust their allocated budget - a metric of campaign delivery efficiency rather than bottom-line commercial outcome. Whether higher spend after activation translates to proportionately better returns is not addressed.

The 4x figure is, like the conversion rate data Criteo has published in earlier updates, drawn from the company's own testing on its own client base. Independent verification has not been published.

Performance data: where the numbers now stand

The June 2026 update contains three performance metrics that update figures Criteo has been disclosing since March 2026. Each represents a progression from earlier disclosures.

On conversion rates, Criteo states that traffic from ChatGPT Ads continues to outperform other referral channels. The March 2026 update cited a 1.5x conversion rate advantage based on a sample of 500 US retailers observed in February 2026. The May 5, 2026 update moved that figure to "approaching 2x" in specific categories - consumer electronics, lifestyle and wellbeing, and home and garden. The current update does not quote a specific multiple, stating instead that conversion rates "continue to outperform other referral channels." That phrasing is consistent with the earlier direction but does not provide a new figure.

On click-through rates, the June 2026 update introduces a new metric not present in earlier disclosures. According to Criteo, CTRs from ChatGPT Ads are "consistently two to three times higher than comparable formats in other environments." That range is relatively wide, and the comparison class - "comparable formats in other environments" - is unspecified. The metric nonetheless provides a signal about user engagement with the ad format inside conversations.

On customer acquisition, the June 2026 update states that more than 80% of ad-driven ChatGPT Ads traffic comes from new customers. This figure, if consistent across the advertiser base, would give the platform a specific commercial positioning as a discovery and acquisition channel rather than a retargeting surface. It aligns with an argument Criteo has been making since March 2026: that budgets allocated to ChatGPT Ads are additive rather than cannibalizing spend from other channels.

The 80% new-customer figure is the most commercially pointed data point in the update. For advertisers evaluating whether ChatGPT Ads can genuinely reach consumers not already in their CRM or retargeting pools, it speaks directly to that question. It also has implications for how brands should think about attribution: first-touch models would weight this channel heavily, while last-touch models would likely give it less credit given the early-funnel nature of conversational discovery.

Criteo GO now carries ChatGPT Ads for smaller advertisers

A structural access point is new in the June 2026 update. According to Criteo, ChatGPT Ads inventory is now available through Criteo GO, the company's self-service, cross-channel performance platform. The significance of this lies in the commercial tier it unlocks. Criteo GO, which opened to full self-service for small and mid-sized businesses on March 31, 2026, was designed to allow advertisers to launch campaigns in as few as five clicks without a managed service agreement.

Before this integration, accessing ChatGPT Ads through Criteo required working through the standard enterprise pathway. Adding the inventory to GO means a small or mid-sized business can in principle access OpenAI's conversational AI advertising surface through the same interface it uses to run display, video, native, and social campaigns. The budget threshold implications are meaningful: GO does not carry the six-figure minimum commitments that characterized early ChatGPT Ads access. OpenAI's own self-serve Ads Manager, which launched to all US businesses on May 5, 2026, eliminated minimum spend requirements entirely. The Criteo GO route provides an alternative pathway through commerce-data-driven infrastructure rather than OpenAI's direct interface.

Context: how the ChatGPT advertising ecosystem has developed

The Criteo update lands at a moment of sustained commercial activity around ChatGPT advertising. Since the pilot formally launched on February 9, 2026, at a $60 CPM with minimum commitments of $200,000 to $250,000, the platform has moved through several distinct stages. CPMs fell to as low as $25 by mid-April 2026. The self-serve Ads Manager opened to all US businesses on May 5, adding cost-per-click bidding and a Conversions API for post-click measurement. Custom audience targeting arrived on May 14. Daily budgets and US ZIP-code-level geo-targeting followed on May 22. Conversion-optimized campaigns were expected to begin rolling out from June 5 for accounts with at least one active conversion event.

OpenAI has been actively hiring for ChatGPT advertising roles in Tokyo, Seoul, London, and Sao Paulo, reflecting the intent to build regional sales and client success capacity in the same markets now opening for Criteo's advertisers. The technology partner roster has also grown. StackAdapt joined on May 5, 2026, alongside Criteo, Kargo, Adobe, and Pacvue.

For the marketing community, the trajectory of ChatGPT Ads matters in a specific way. The platform is assembling measurement infrastructure - the Conversions API, pixel deployment, custom audiences, conversion optimization - at roughly the pace Google and Meta spent years building. Advertisers who have grown accustomed to granular attribution on established channels are watching whether ChatGPT can close that gap. Third-party intelligence tools are emerging alongside the ad product itself: Adthena launched its ChatGPT Ads Intelligence Platform on May 11, 2026, monitoring more than 300,000 daily prompts to track which brands are advertising, which queries trigger ads, and how share of presence compares across competitors.

Criteo's position in this landscape is structurally distinctive. The company reported in Q1 2026 that media spend crossed $1 billion for the first time, even as revenue declined and two retail media client departures created a $27 million quarterly headwind. The ChatGPT integration represents one of the primary levers the company is pulling to offset that pressure. Whether the 2,000-brand figure and the Prompt Smart Ads performance claim translate into revenue recovery will be visible in Q2 and Q3 results. The Q2 2026 guidance Criteo provided in May pointed to Contribution ex-TAC of $260 million to $264 million, with full-year performance at constant currency expected to decline in the low single digits.

That financial backdrop gives the June 2026 update a function beyond product announcement. It is also a signal to investors and clients that the OpenAI integration is continuing to build commercial momentum in the months following its launch - even as the broader Criteo business works through structural transitions in its retail media segment.

Timeline

Summary

Who: Criteo (NASDAQ: CRTO), a Paris-headquartered global commerce media platform, and OpenAI, the company behind ChatGPT.

What: Criteo today disclosed that more than 2,000 brands are now advertising on ChatGPT through its integration, doubled from over 1,000 in May 2026. The company also launched Prompt Smart Ads - a creative capability combining catalog data, commerce intelligence, and prompt-level insights to generate ad creatives tailored to individual user queries - with early testing showing approximately 4x higher spend after activation. Click-through rates are reported at two to three times higher than comparable formats elsewhere, and more than 80% of ChatGPT Ads traffic driven through the platform comes from new customers. ChatGPT Ads inventory is now also available through Criteo GO, extending access to small and mid-sized businesses.

When: The June 2026 update was published on June 22, 2026. The underlying Criteo-OpenAI partnership launched on March 2, 2026; the GO platform's self-service expansion opened March 31, 2026; and the UK, Japan, and South Korea markets were added in the period covered by this update.

Where: The ChatGPT Ads integration is now live across seven countries: the United States, Australia, Canada, New Zealand, the United Kingdom, Japan, and South Korea. Criteo operates globally across more than 100 markets, with headquarters in Paris, France.

Why: Criteo is using the ChatGPT Ads integration to build commercial momentum as the company navigates a period of revenue pressure from retail media client departures that created a $27 million quarterly headwind in Q1 2026. The integration positions Criteo as the first and longest-standing ad tech partner within ChatGPT's advertising infrastructure, at a moment when the platform is expanding measurement capabilities, adding technology partners, and growing its advertiser base. For the broader marketing industry, the update provides the most specific performance data Criteo has published to date on conversational AI advertising, including CTR multiples and new-customer acquisition rates.