OpenAI Partners With Magnite, PubMatic on Ad Sales
The ChatGPT ad-selling deals cover unsold ad space, with financial terms left undisclosed.
Updated on Nov. 2, 2026 in Advertising
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OpenAI has signed deals with sell-side platforms Magnite and PubMatic to sell unsold ChatGPT ad inventory. The partnerships cover remnant inventory, meaning ad space not sold through direct deals, and their financial terms were not disclosed.
Why it matters
OpenAI reversed its earlier stance on advertising as it looks to diversify revenue beyond subscriptions. Outsiders cannot yet judge how much these partnerships will add to the company's top line.
ChatGPT's ad business reached a $1 billion annualized run rate by August 2026, up from roughly $100 million in March 2026. Ads had expanded to 89 countries with more than 100,000 advertisers as of October 21, 2026, while the financial terms of the new partnerships remain undisclosed.
The players
OpenAI
OpenAI is the artificial intelligence company that develops ChatGPT and has moved to add advertising to its free and lower-cost tiers.
Magnite
Magnite is a sell-side advertising platform that runs automated auctions for publishers' unsold ad inventory.
PubMatic
PubMatic is a sell-side advertising platform that helps publishers monetize their ad inventory through programmatic auctions.
The details
A publisher hands its available ad slots to a sell-side platform, which runs automated auctions where advertisers bid in real time. Under the new partnerships, Magnite and PubMatic will handle ChatGPT's remnant inventory, while OpenAI's premium subscription tiers remain ad-free.
Timeline
February 2026: OpenAI began testing ads in ChatGPT in the United States, targeting free and Go tier users.
March 2026: The ad business ran at approximately $100 million in annualized revenue.
August 2026: The ad business reached a $1 billion annualized run rate.
October 21, 2026: ChatGPT ads expanded to 89 countries and drew more than 100,000 advertisers.
November 2, 2026: OpenAI signed ad-selling deals with Magnite and PubMatic.
Market Landscape
The deals place ChatGPT's unsold ad space inside the same programmatic exchanges that Magnite and PubMatic already run for web publishers. That positions OpenAI to compete for advertiser budgets alongside established digital ad channels rather than building a separate sales operation.
For ChatGPT users on the free and Go tiers, the ad rollout means sponsored content appears in their experience, while premium subscribers continue to see no ads. The new sell-side partnerships do not change what users pay or how the paid tiers work.
The takeaway
Subscription tiers that stay ad-free show how OpenAI is splitting its user base between free ad-supported access and paid access, a choice that will shape how much advertising revenue it can build.
Further reading
For more on how ad space is bought and sold across the web, see Advertising.
Live Poll
Would you be fine with ads in your ChatGPT, if free users still get them?
