StackAdapt announced on May 5, 2026, that it is offering advertisers access to ads in ChatGPT, becoming one of a small group of technology partners inside OpenAI's advertising pilot. The Toronto-based platform joins Criteo, Kargo, Adobe, and Pacvue on that short list - a roster confirmed by PPC Land's coverage of the Ads Manager launch published the same day.

The announcement marks a concrete expansion of StackAdapt's position in conversational AI, extending its programmatic capabilities into a channel that did not exist for advertisers as recently as February 9, 2026. It also arrives on a day when OpenAI simultaneously opened its self-serve Ads Manager to all US businesses, dropped the minimum spend threshold entirely, and introduced cost-per-click bidding alongside its existing CPM model.

Conversational AI as an ad channel

Ads in ChatGPT are clearly labeled and separated from ChatGPT's organic responses, appearing based on the context of a user's conversation rather than keyword targeting or behavioral profiles. According to the announcement, StackAdapt is enabling advertisers to test and learn in an early-stage environment and provide feedback to help shape the channel as it continues to develop.

This is structurally different from what programmatic advertisers are used to. There is no static page waiting for a banner. There is no pre-roll slot. Responses are generated dynamically, and whatever appears alongside them must be capable of fitting context at the moment it is served. The format sits somewhere between the intent signals of search advertising and the environment of display - not quite either, and with its own measurement characteristics.

According to the announcement, StackAdapt positions the opportunity around three capabilities: reaching people during active exploration and comparison, delivering messaging aligned with real-time conversational context, and influencing decision-making early in the discovery process. The emphasis on discovery and research - rather than lower-funnel conversion - reflects how OpenAI has framed the channel from the outset.

"Conversational AI is rapidly becoming a new touchpoint in the customer journey," said Yang Han, Co-Founder and CTO at StackAdapt. "Our focus is helping advertisers participate in those moments in ways that are relevant and thoughtfully integrated into a broader AI-powered marketing strategy."

What StackAdapt brings to the integration

According to the announcement, StackAdapt's approach to activating ads in ChatGPT is built around four areas. The first is vertical specialization - deep industry knowledge across B2B, retail, CPG, e-commerce, travel, and education. The second is cross-channel orchestration, meaning activation across CTV, display, native, and performance channels within a unified platform. Third is managed service and scalable execution, covering strategic guidance, creative optimization, and operational support. Fourth is brand safety and quality controls, including in-house review processes and inventory standards intended to ensure messaging fits the context where it appears.

The emphasis on brand safety matters in this specific environment. ChatGPT's user base spans an unusually broad range of topics and intents - from casual curiosity to active purchase research. A conversation about running shoes sits next to a conversation about medical symptoms. OpenAI's published advertising principles state that ads will not appear near sensitive or regulated topics including health, mental health, or politics. But how that policy interacts with a dynamic, conversation-driven interface is still being established in practice.

The managed service layer is also notable. StackAdapt is not simply opening a programmatic pipe. According to the announcement, the platform offers strategic guidance and creative optimization as part of its service model - a posture more consistent with how early-stage digital advertising channels are typically activated, before self-serve infrastructure matures.

Where StackAdapt fits in the broader ChatGPT partner structure

OpenAI supports multiple buying pathways into ChatGPT advertising. There is the self-serve Ads Manager, now open to US businesses as of May 5, 2026. And there is the technology partner route, which provides a layer of infrastructure, campaign management, and managed service that the self-serve tool does not yet offer. StackAdapt sits in the technology partner category, alongside Criteo, Kargo, Adobe, and Pacvue.

The technology partner distinction matters operationally. Partners handle campaign budgeting, bidding strategy, and ad creative. OpenAI's own system handles delivery decisions. For advertisers already running programmatic campaigns through StackAdapt across CTV, display, native, and other formats, the integration means ChatGPT placements become an extension of existing workflows rather than a separate platform relationship to manage.

Criteo was the first technology partner to be formally identified, on March 2, 2026, connecting approximately 17,000 advertiser clients to ChatGPT's Free and Go tiers. By May 5, 2026, Criteo reported over 1,000 brands running active campaigns through its API connection. Internal Criteo data showed AI-referred conversion rates approaching twice those of traditional search in categories including consumer electronics, lifestyle, and home and garden - though that data comes from Criteo's own client base and has not been independently verified.

That early conversion data is significant context for StackAdapt's move. The argument for ChatGPT advertising has always rested on user intent: someone who asks a conversational AI for product recommendations is deeper into a decision than someone passively scrolling a social feed. If the conversion metrics hold, they give programmatic platforms a data-backed rationale for building out infrastructure on the channel.

The timeline behind the move

To understand the May 5 announcement in its full context, the pace of OpenAI's advertising buildout is worth tracing carefully. OpenAI formally confirmed plans to test advertising on January 16, 2026, ending months of speculation. The pilot formally launched on February 9, 2026, at a CPM of $60, with a minimum advertiser commitment set between $200,000 and $250,000. Early participants included Target, Ford, Mrs. Meyer's, and Adobe, alongside holding company partners WPP Media, Omnicom, and Dentsu.

Those entry conditions were steep. A $200,000 minimum commitment meant only the largest and most committed advertisers could participate. That threshold had already been lowered to $50,000 by April 2026, and was removed entirely on May 5. The CPM itself fell from $60 at launch to as low as $25 by mid-April, before OpenAI introduced CPC bidding as an additional option.

By March 26, 2026, the ChatGPT advertising pilot had crossed $100 million in annualized revenue within six weeks of launch - a pace that attracted further attention from the advertising industry. OpenAI also announced expansion to Canada, Australia, and New Zealand at that point, and named David Dugan, a former Meta advertising executive, to lead its global advertising solutions team.

StackAdapt, for its part, has been building toward this type of integration. The company launched its AI assistant Ivy in July 2025, processing more than 1,700 in-platform messages during the 30 days before launch. Ivy operates through natural language prompts and provides real-time campaign insights, on-demand optimization guidance, and targeting recommendations. The MCP Server StackAdapt launched later - bringing campaign intelligence into Claude and other AI workflows - represents the same underlying bet: that AI-native interfaces are becoming the primary layer through which advertising professionals will interact with campaign data.

Contextual targeting inside a conversation

The technical mechanics of ChatGPT advertising are worth examining closely. Unlike behavioral targeting - which relies on a user's browsing history, purchase signals, or demographic profile - ChatGPT ads are triggered by the context of an active conversation. A user asking about comparing laptop models might see a sponsored result from a computer manufacturer. Someone exploring travel options for a summer trip might encounter a sponsored hotel or airline.

This is closer in spirit to contextual advertising than to audience-based targeting. OpenAI's stated privacy principles prohibit selling user conversation data to advertisers. What advertisers receive is placement in a relevant conversational moment, not a detailed profile of the user they are reaching. That distinction shapes both the creative strategy and the measurement approach required for the channel.

StackAdapt's announced capabilities in vertical specialization - B2B, retail, CPG, e-commerce, travel, education - map reasonably well to the categories where conversational intent is most commercially legible. Someone using ChatGPT to compare project management tools is exhibiting B2B purchase intent. Someone asking about protein powder brands is showing CPG commercial intent. The challenge is that the same conversation thread can move fluidly across topics, and the signals are probabilistic rather than deterministic.

Attribution: the open question

Attribution remains the structural gap across ChatGPT advertising. OpenAI introduced a Conversions API and pixel-based measurement on May 5, 2026, as part of the self-serve rollout. That addresses some of the gap, but the depth of post-click attribution that performance advertisers expect from established platforms is still being built.

PPC Land has tracked this limitation since the pilot began. The shopper journey through ChatGPT - from discovery to product recommendation to click to purchase - involves more steps and less instrumentation than a comparable path through paid search. For a platform like StackAdapt, whose clients expect cross-channel performance reporting with consistent metrics, building that measurement layer is as important as the access itself.

OpenAI also deployed OAI-AdsBot, a dedicated web crawler documented in April 2026, designed to inspect the landing pages of ChatGPT advertisements for policy compliance and relevance. The crawler validates that destination pages match the context in which ads are served - a quality control mechanism that matters for brand safety enforcement.

What the marketing industry is watching

The participation of five technology partners - Criteo, Kargo, Adobe, Pacvue, and StackAdapt - on the same day OpenAI opened self-serve access represents a structural shift in how ChatGPT advertising is being distributed. The channel is no longer a closed test accessible only to a few large brands through direct OpenAI relationships. It is now available through established programmatic infrastructure.

For agencies and performance marketers who have been watching from the sidelines, that shift matters. The technology partner route offers managed service support during a period when the channel's creative conventions, bidding dynamics, and measurement norms are still being established. The self-serve route offers direct access at lower cost and without minimum commitments.

Neither route yet answers the fundamental question of whether ChatGPT advertising drives outcomes at scale that justify its CPM. The early conversion data is promising but preliminary. The creative requirements are genuinely different from any existing format. And the measurement infrastructure, while improving, is not yet at the level that performance advertisers apply to paid search or social.

StackAdapt's framing - as a platform enabling advertisers to test and learn while providing feedback to help shape the channel - accurately describes the current state. This is still an early-stage environment. The technology partners, including StackAdapt, are part of a process of collective discovery about what works and what does not inside conversational AI advertising.

Timeline

  • December 2, 2025 - OpenAI issues internal "code red" directive, pausing advertising development to focus on core product quality
  • January 16, 2026 - OpenAI formally confirms plans to test advertising in ChatGPT for free and Go users in the United States
  • February 9, 2026 - ChatGPT advertising pilot formally launches at $60 CPM with a $200,000 minimum commitment, covering Free and Go subscription tiers; early advertisers include Target, Ford, Mrs. Meyer's, and Adobe
  • March 2, 2026 - Criteo announced as first ad tech partner in the ChatGPT pilot, connecting approximately 17,000 advertisers
  • March 26, 2026 - ChatGPT advertising crosses $100 million in annualized revenue within six weeks; OpenAI announces expansion to Canada, Australia, and New Zealand; David Dugan named global head of advertising solutions
  • April 10, 2026 - OpenAI quietly launches self-serve Ads Manager, lowering minimum spend threshold from $250,000 to $50,000
  • April 17-18, 2026 - ChatGPT CPMs reported as low as $25, down from $60 at launch; minimum threshold cut to $50,000
  • April 21, 2026 - OAI-AdsBot appears in OpenAI's public crawler documentation, designed to inspect ChatGPT ad landing pages
  • May 5, 2026 - OpenAI opens self-serve Ads Manager to all US businesses with CPC bidding and Conversions API; Criteo discloses over 1,000 brands live on ChatGPT ads with conversion rates approaching 2x traditional search; Kargo joins as technology partner; StackAdapt announces access to ChatGPT advertising for its advertisers

Summary

Who: StackAdapt, the Toronto-based AI advertising and orchestration platform, announced by Yang Han, Co-Founder and CTO. The announcement places StackAdapt alongside Criteo, Kargo, Adobe, and Pacvue as an OpenAI technology partner.

What: StackAdapt is offering its advertisers access to ads in ChatGPT as a technology partner in OpenAI's advertising pilot. The integration covers vertical specialization across B2B, retail, CPG, e-commerce, travel, and education; cross-channel orchestration across CTV, display, native, and performance channels; managed service support; and brand safety and quality controls.

When: The announcement was made on May 5, 2026, the same day OpenAI opened its self-serve Ads Manager to all US businesses and introduced CPC bidding.

Where: ChatGPT advertising currently reaches Free and Go tier users in the United States, Canada, Australia, and New Zealand. StackAdapt operates globally as a programmatic platform.

Why: Conversational AI is emerging as a new advertising surface where users exhibit high commercial intent during active research and comparison. StackAdapt's participation in the early-stage pilot gives its advertiser clients access to this channel through existing programmatic workflows, while contributing to the development of creative and measurement norms for a format that is still being defined.

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