OpenAI signs deals with Magnite and PubMatic to fill ChatGPT ad space. OpenAI / Wikimedia Commons (Public domain) The ChatGPT maker is bringing in two independent ad-tech platforms to sell its unused ad inventory as its ad business scales Sponsored: Vera - AI-powered prediction market intelligence, built for serious analysts Explore Vera OpenAI has signed deals with ad-tech companies Magnite and PubMatic to fill unsold advertising space inside ChatGPT. The company that once treated ads as a last resort is now building a full ad-selling machine. Magnite and PubMatic are sell-side platforms, usually called SSPs. Think of them as auction houses for ad space. A publisher hands over its available slots, and the SSP runs automated auctions where advertisers bid in real time. That automated buying and selling is called programmatic advertising. Nobody negotiates each ad placement by hand. Software does the matching in milliseconds. Under these partnerships, the two companies will handle what the industry calls remnant inventory. That is the ad space a publisher hasn't sold through its direct deals. The financial terms of the partnerships were not disclosed. So it is unclear how revenue will be split, or how much of ChatGPT's inventory will flow through these channels. Both companies are independent SSPs that compete with Google's AdX, the ad exchange run by the biggest name in digital advertising. Both have also been focusing on agentic AI ad tools, meaning software that can make advertising decisions with less human hand-holding. OpenAI began testing ads in ChatGPT in the United States in February 2026. The tests targeted users on the free plan and the Go tier. AI, tech, and the markets they move - in one daily briefing. Daily. Free. Join 34,000+ readers across crypto, finance, and policy. By March, the ad business was running at approximately $100 million in annualized revenue. By August 2026, that figure had reached a $1 billion annualized run rate. A quick note on that metric. An annualized run rate takes recent revenue and projects it across a full year. It's a snapshot of current pace, not a tally of money already collected over twelve months. As of October 21, 2026, ChatGPT ads had expanded to 89 countries and drawn more than 100,000 advertisers. OpenAI is keeping one line in the sand. Its premium subscription tiers remain ad-free, so paying users don't see the sponsored content that free users do. OpenAI did not always sound this enthusiastic about advertising. The company previously described ads as a "last resort" for funding its products. It reversed that stance as it looked to diversify its revenue streams beyond subscriptions. The Magnite and PubMatic deals add to a broader advertising ecosystem OpenAI has been assembling. That network also includes major agencies and tech platforms, giving advertisers several routes into ChatGPT. For Magnite and PubMatic, the deals are a notable win. Independent SSPs spend much of their existence competing against Google's AdX. Landing a supply partner like ChatGPT gives them inventory from one of the most closely watched AI products in the world. For advertisers, programmatic access could lower the barrier to entry. Buyers already using these platforms may be able to reach ChatGPT users through tools they know, rather than setting up a separate relationship from scratch. Because the terms were not disclosed, outsiders can't yet judge how much these partnerships will add to OpenAI's top line. Disclosure: This article was edited by Diego Almada Lopez. For more information on how Cryptobriefing create and review content, see its Editorial Policy.

Proximic by Comscore expands integration across Magnite's CTV ecosystem. First real-time contextual integration across Magnite SpringServe connects audience intelligence, premium supply and activation workflows in one place, helping publishers unlock new demand and enabling advertisers to scale privacy-forward campaigns. October 28, 2026 08:00 ET | Source: Comscore, Inc. NEW YORK, Oct. 28, 2026 (GLOBE NEWSWIRE) - Comscore (Nasdaq: SCOR) today announced an expanded partnership with Magnite (Nasdaq: MGNI) bringing Proximic's Predictive Audiences, contextual intelligence and ID-free activation capabilities into Magnite's SpringServe video platform, which combines ad serving and programmatic capabilities. Proximic by Comscore's AI-driven Predictive Audiences combine audience and contextual signals to predict where consumers are most likely to engage next. Powered by Comscore's extensive datasets and third-party partner network, Predictive Audiences deliver scalable, ID-free targeting that extends reach and improves performance. The partnership with Magnite provides publishers with a new path to unlock demand and buyers with a privacy-forward way to scale campaigns across a range of CTV inventory, including high-impact formats such as pause ads. Future Today is among the first publishers using Proximic's Predictive Audience segments through the integration. The solution combines Future Today's first-party viewership data with contextual signals to enable privacy-compliant targeting across its expansive CTV inventory. Future Today can package this inventory around timely seasonal audiences, such as fall allergy sufferers for allergy medicine advertisers and Halloween candy buyers for CPG brands, giving buyers greater precision and scale when purchase intent is likely to be high. "This partnership gives us access to a broader range of demand partners through Magnite while creating new ways to showcase the value of our inventory and content," said Tim Ware, VP, Future Today Marketplace. "By combining Proximic's AI-driven Predictive Audiences with Magnite's ad server and programmatic infrastructure, we can quickly and efficiently package our inventory in new ways. Our preliminary findings indicate that this approach can improve both precision and scale, unlocking more creative opportunities and stronger outcomes for our growing portfolio of advertisers." "CTV isn't short on premium content or advertiser demand; the challenge has always been connecting those pieces across the entire transaction chain," said Jessica Trainor, SVP Partnerships, Proximic by Comscore. "This integration puts audience intelligence right inside the infrastructure publishers already use to manage and monetize CTV inventory. That matters for advertisers that need more interoperable, privacy-forward connections between supply, data, and outcomes." "Partnering with Proximic by Comscore brings a trusted, independent layer of audience intelligence to our curated CTV deals," said Kristen Williams, SVP, Partnerships at Magnite. "We're making it easier for publishers to package their inventory with contextual signals into addressable opportunities that buyers can act on. Bringing Proximic by Comscore's predictive audience intelligence directly into SpringServe adds a unique layer to this partnership by connecting contextual signals with the ad-serving infrastructure publishers already use to manage and monetize their CTV inventory." About Comscore Comscore is a trusted global partner for planning, activating, and evaluating media across platforms. Its unmatched data footprint brings together Connected TV (CTV), digital, national and local linear TV intelligence with advanced audience insights to help media buyers and sellers understand how audiences engage across screens and make business decisions with confidence. Comscore is a preeminent provider of independent, comprehensive cross-platform measurement and decisioning solutions designed to improve outcomes at scale. About Magnite We're Magnite (NASDAQ: MGNI), the world's largest independent sell-side advertising company. Publishers use our technology to monetize their content across all screens and formats including CTV, online video, display, and audio. The world's leading agencies and brands trust our platform to access brand-safe, high-quality ad inventory and execute billions of advertising transactions each month. Anchored in bustling New York City, sunny Los Angeles, mile high Denver, historic London, colorful Singapore, and down under in Sydney, Magnite has offices across North America, EMEA, LATAM, and APAC.