Monday Briefing: ChatGPT Just Opened Its Ad Platform to Everyone

Good morning, it's James here. Six weeks. That's how long it took ChatGPT's ad platform to hit $100 million in revenue. This month, they're opening the doors to everyone. Meanwhile, Perplexity just walked away from ads entirely. The AI search monetization playbook is splitting in real time, and the choices each platform is making will shape where your budgets go next.

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The Lead: ChatGPT Opens Self-Serve Ads This Month

OpenAI's ad pilot crossed $100 million in annualized revenue in just six weeks after launching in February, making it one of the fastest-growing ad platforms in history (Search Engine Land). Now, in April, self-serve access goes live, dropping the $200,000 minimum commitment and opening the platform to mid-market advertisers for the first time.

The numbers that matter: Over 600 advertisers are already running campaigns. Only 20% of eligible users are seeing ads, with 85% of Free and Go tier users eligible. Fewer than 7% of ads get flagged as low-relevance. OpenAI hired Dave Dugan, formerly of Meta's ad team, to run the expansion.

Why CMOs should care: This isn't another display network. ChatGPT ads sit inside a conversational context where users are actively researching, comparing, and making decisions. The intent signal is closer to search than social. And with Google rolling AI Mode ads into shopping and travel queries simultaneously, the "AI answer layer" is becoming a real media channel, not a science experiment.

The take: The most interesting subplot is what Perplexity did in the opposite direction. They killed their ad program entirely in February, with an executive telling the Financial Times that ads risk making users "suspicious of everything" (Search Engine Land). Two AI search platforms, two fundamentally different bets on how trust and monetization coexist. If you're testing ChatGPT ads this month, go in with your eyes open: 65% of consumers still say they're uncomfortable with AI-generated ads (eMarketer). The early-mover advantage is real, but so is the trust deficit.

Money Moves

Publicis just wrote a $500 million check for sports. The French advertising giant acquired 160over90, WME's sports marketing agency, in a deal that Publicis CEO Arthur Sadoun framed with zero ambiguity: "Our next big bet is sport" (Adweek).

160over90 brings 670 employees across four continents and a client roster that includes Super Bowls, Olympics, and World Cups. They'll fold into Publicis Sports under CEO Suzy Deering, with a strategic partnership giving Publicis early access to WME's talent roster for content and brand deals.

Why this matters now: The global sports media market is valued at $150 billion, with sponsorships exceeding $90 billion. With the FIFA World Cup on US soil this summer, brands are scrambling. But as Digiday reported this week, smart CMOs are resisting the FOMO trap. "Clients are keeping the coin purse very close because of just the nature of the world," noted Luis Velasco of Media by Mother (Digiday). Publicis is betting that brands need a single partner who can connect data, media, and live experiences. Sadoun's dig at competitors was barely disguised: "This is the polar opposite strategy of our peers."

Musical Chairs

OpenAI lost its CMO at the worst possible time. Kate Rouch stepped down permanently on April 3 to focus on cancer recovery, just as ChatGPT's ad platform opens to the world (Ad Age). Rouch, who joined from Coinbase in December 2024, had already taken medical leave last summer for breast cancer treatment. Former Facebook CMO Gary Briggs is leading the search for her replacement. In a LinkedIn post, Rouch wrote: "Courage isn't always pushing harder. Sometimes it's choosing to prioritize different things." The timing underscores how critical the next hire will be. OpenAI's ad business is scaling faster than anyone expected, and the CMO seat is empty.

Cadillac hired David Mogensen from Uber as CMO, where he oversaw marketing across 70+ countries (Ad Age). He replaces Melissa Grady Dias and brings experience from BMW and Google. GM also lost its Buick/GMC CMO Suzanne Guzzo, with a replacement search underway.

The Reading List

• "Sports Marketing: How Brands Navigate the 2026 Budget Crunch" - Digiday on why the smartest brands are doubling down on existing partnerships instead of chasing every World Cup activation. Lavazza's VP of Marketing puts it plainly: "Let's not get into the FOMO trap."

• "Publicis Acquires 160over90, Makes Sports Its 'Next Big Bet'" - Adweek's deep dive on the deal, including Sadoun's competitive positioning and what the Publicis-WME partnership means for talent-driven marketing.

• "CMO Tenure 2026: Snapshot of an Expanding Role" - Spencer Stuart's annual report finds average CMO tenure at 4.1 years, with 9% making the leap to CEO. The headline stat: 50% of S&P 500 CMO roles are now held by women.

• "Coca-Cola Celebrates Decades of Restaurant Partnerships with 'And a Coke'" - The Drum breaks down how Coke united 13 competing chains, representing $66 billion in combined sales, into a single campaign built around a three-word phrase everyone already says.

One More Thing

Two AI platforms. Two opposite bets. ChatGPT says ads and trust can coexist. Perplexity says they can't. Both are making rational decisions based on their business models. But for CMOs, the real question isn't which platform is right. It's whether you're building a media strategy flexible enough to work in both worlds.

Back next Monday. Stay sharp out there.

—James