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OpenAI Expands Ad Partnerships With Magnite And PubMatic

OpenAI is expanding its ad partnerships with companies like Magnite and PubMatic, according to AdExchanger. This move may indicate a shift in OpenAI's advertising strategy, which could impact the company's growth and revenue.

Original reporting · adexchanger.com

Original: “OpenAI May Not Be So Open For Long; Prediction Markets Bet On Endorsements”

Read “OpenAI May Not Be So Open For Long; Prediction Markets Bet On Endorsements” at AdExchanger →
OpenAI May Not Be So Open For Long; Prediction Markets Bet On Endorsements
Image: AdExchanger

How this was written. Awesome B2B wrote this article with a language model from AdExchanger’s reporting (model: @cf/meta/llama-3.3-70b-instruct-fp8-fast); it describes that reporting rather than adding to it. The original, linked above, is the full story.

Key points from AdExchanger’s report

  • OpenAI is expanding its ad partnerships with companies like Magnite and PubMatic
  • Prediction markets are using celebrity endorsements to promote their brands
  • Ad buyers are reevaluating their Google search budgets due to the impact of AI Overviews on ad performance

OpenAI has been following a classic walled garden platform playbook for its ChatGPT advertising business, but it may be opening up to third-party intermediaries, at least for now. AdExchanger reported that OpenAI has signed deals with Magnite and PubMatic to fill unused ad space for ChatGPT.

Other ad-tech partners of OpenAI include LiveRamp, Criteo, StackAdapt, and Amazon Ads. The company's VP of partnerships, Samantha Jacobson, was previously The Trade Desk's chief strategy officer, which could influence OpenAI's partnership strategy.

The partnership push by OpenAI has sparked interest in the advertising industry, with some companies watching the development closely. The Trade Desk, in particular, may be monitoring OpenAI's moves, given Jacobson's previous role at the company.

Meanwhile, prediction markets like Kalshi, Polymarket, and Novig are trying to become household names by associating themselves with celebrity spokespeople. These companies have launched star-studded ad campaigns, featuring sports megastars and actors, to promote their brands.

However, the strategy of using celebrity endorsements has raised questions about the reputation of these companies. A poll by Ipsos found that many consumers view prediction markets as bad for society or similar to gambling, which could impact the effectiveness of these ad campaigns.

Ad buyers are also reevaluating their Google search budgets due to the impact of AI Overviews on ad performance. Some advertisers are reallocating their budgets to other channels, such as Meta and ChatGPT, or other Google products like YouTube and Demand Gen.

The shift in advertiser spending may reflect a broader trend in the advertising industry, with companies seeking to optimize their ad campaigns in response to changing user behavior and technological advancements.

Questions and answers

What is OpenAI's advertising strategy?

OpenAI is following a classic walled garden platform playbook, but it may be opening up to third-party intermediaries.

Why are prediction markets using celebrity endorsements?

Prediction markets like Kalshi, Polymarket, and Novig are using celebrity endorsements to promote their brands and become household names.

How are ad buyers responding to the impact of AI Overviews on ad performance?

Ad buyers are reevaluating their Google search budgets and reallocating them to other channels, such as Meta and ChatGPT, or other Google products like YouTube and Demand Gen.

Read the full story at AdExchanger More from Tuesday, November 3, 2026’s edition