Criteo to plug 17,000 advertisers and $4B spend into OpenAI’s ChatGPT ad pilot

Criteo said it will become the first advertising-technology partner to integrate with OpenAI’s advertising pilot in ChatGPT Free and ChatGPT Go in the United States, connecting 17,000 advertisers and more than $4 billion in annual media spend to the conversational AI platform as the rollout begins in the coming weeks.

The announcement, distributed by PR Newswire on March 2, 2026, positions Criteo as an early bridge between traditional commerce media buying and “conversational discovery” inside large language model applications. Criteo described the integration as enabling brands to make ad buys through its commerce media platform inside ChatGPT’s pilot, which PPC Land noted OpenAI began formally testing on February 9, 2026.

Criteo’s chief executive, Michael Komasinski, framed the move as foundational for AI-era advertising. “This integration with OpenAI represents an exciting step forward in advancing advertising in an emerging AI experience,” he said in the company release. He added the pilot will help “shape how advertising can support discovery and consideration within Large Language Model (LLM) platforms, grounded in experiences that are additive, relevant, and built on user trust.”

Criteo bolstered the commercial case for the partnership with internal performance data. The company said aggregated insights from a February 2026 sample of 500 U.S. retailers showed users referred from LLM platforms convert at approximately 1.5 times the rate of other referral channels; PR Newswire included the footnote: “Observed on a sample of 500 Criteo retailers in the U.S., February 2026.” The same materials note Criteo “activates more than $4 billion in annual media spend and works with 17,000 advertisers globally.”

The integration follows a string of platform tie-ups for Criteo: PPC Land recorded that Google named Criteo its first onsite retail media partner in September 2025 and that Criteo announced a multi‑year DoorDash retail media deal in October 2025. Industry coverage describes the OpenAI agreement as a third major platform relationship within roughly six months for the ad-tech firm.

Market implications are immediate. If the 1.5x conversion lift holds at scale, advertisers could reallocate budgets toward conversational placements or experiment with performance-driven campaigns inside ChatGPT, accelerating the shift of discovery from search and social feeds into AI conversations. For Criteo, the deal offers a chance to extend its commerce media stack into a new discovery surface and to monetize advertiser demand in a product space OpenAI is actively testing.

Yet important gaps remain. None of the Criteo materials or news reports specified how ads will be formatted, targeted, priced, measured, or what consent and privacy controls will apply in ChatGPT. No statement from OpenAI was included in the materials reviewed. That absence has sparked governance concerns voiced on social media; LinkedIn commenter Baptiste Solente warned that “When ads enter AI conversations, this isn’t media anymore, it’s decision authority. The open question isn’t targeting or measurement, it’s who governs what the AI is allowed to recommend before it acts.”

Regulators and advertisers will be watching those issues closely as the pilot scales. For now, Criteo is betting that commerce intelligence and AI-driven decisioning can make conversational AI a meaningful discovery surface. How quickly advertisers move dollars and how the industry fills the technical and policy blanks will determine whether the ChatGPT pilot reshapes digital advertising or simply creates a parallel, narrowly targeted ad channel.