OpenAI Is Done Borrowing Someone Else's Ad Stack
For a company that once treated advertising like a moral failing, OpenAI is moving fast.
As of this month, ChatGPT is showing ads to all free and Go-tier users in the United States. Sponsored placements appear below responses — clearly labeled, impossible to miss, and powered by Criteo, which has been pitching advertisers on $50,000–$100,000 minimum commitments to get in front of OpenAI's 910 million users. Reuters confirmed the expansion on March 21, following an initial test that launched in February.
But the real story isn't the ad rollout itself. It's what OpenAI is building underneath it.
According to Digiday, OpenAI is actively hiring a monetization infrastructure engineer, an engineering manager, a product designer, a senior manager for ad revenue accounting, and a trust and safety hire dedicated specifically to the ads product. All full-time, all San Francisco, all building a proprietary ad stack from zero. Compensation bands go as high as $385,000 — not the kind of money you spend on plumbing you plan to outsource forever.
This is OpenAI officially becoming an ad platform. And if you've been in this industry long enough, you've seen this movie before.
The Borrowed Stack Problem
Right now, OpenAI's ads business runs on infrastructure it doesn't own. Criteo is the primary interface for ad buying and targeting. The Trade Desk is reportedly in active talks to come in at scale. OpenAI, by contrast, has no ad server, no targeting framework, no measurement stack, and no agency relationships — at least not yet.
Leaning on outside vendors to bootstrap was the smart call. Criteo and The Trade Desk have something OpenAI desperately needs: existing advertiser pipelines, agency integrations, and measurement credibility. You can't launch an ad product cold and expect brands to wire money into a platform with no performance history. So OpenAI borrowed the credibility while it figured out what it was actually building.
"If OpenAI wants to serve ads to 910 million users and make money sooner than later, buying rather than building ad tech is definitely their smartest play," eMarketer principal analyst Nate Elliott told Digiday. But he was clear that's the short game. The long game — the one these job postings signal — is full stack ownership.
The Netflix Playbook, Executed Earlier
This is exactly what Netflix did. When it finally got serious about advertising in 2022, it partnered with Microsoft to get up and running fast. Microsoft had the infrastructure, the sales relationships, the ad tech. Netflix had the audience. It was a marriage of convenience that lasted roughly two years before Netflix started systematically pulling the stack in-house, building its own ad server and launching its own ad platform in 2024.
