Advertising could become a $25 billion business for OpenAI — and pose a threat to Google, according to new estimates on Monday from a top tech analyst.
Evercore ISI’s Mark Mahaney sees the startup generating that level of annual ad revenue by 2030 if it executes well on rolling out this new business.
OpenAI said on Friday that free and Go users of ChatGPT would start seeing ads “in the coming weeks.” OpenAI also laid out its advertising principles, such as clearly labeling them and not sharing user conversations with advertisers.
“A path to generating several billion dollars in ad revenue in 2026, going to $25B+ by 2030, seems reasonable,” Mahaney wrote in a note to investors.
That’s based on the likely scale of ChatGPT by that time, the proven monetization of high-intent performance marketing platforms, and the current size of this market, the analyst added.
OpenAI’s revenue is growing fast already. CFO Sarah Friar said in a recent blog post that the startup’s annualized revenue topped $20 billion in 2025, up from $2 billion in 2023. However, there are big question marks over OpenAI’s losses and whether it can become profitable in the future.
Advertising could be one way for OpenAI to boost its top and bottom lines.
Mahaney noted that Google’s Search and YouTube businesses likely generated close to $300 billion in ad revenue in 2025, with Meta generating an additional $180 billion. These are highly profitable operations, with operating profit margins of 40%, according to the analyst.
ChatGPT has almost 1 billion weekly average users, many of whom share valuable details with the chatbot, such as what they want and need. Advertisers are willing to pay up for access to this treasure trove. This is the type of intent-based information that forms the backbone of the massive digital ad businesses run by Google and Meta.
OpenAI has said that initial test ads will appear at the bottom of ChatGPT answers and be relevant to the user’s conversation with the chatbot. That approach might not be too intrusive for users, while still being attractive to advertisers, Mahaney said.
“OpenAI’s move directly challenges this core revenue stream by offering an alternative, highly engaging platform for users to discover products and services,” Mahaney wrote. “If ChatGPT can successfully integrate ads that are helpful rather than intrusive, it could siphon off valuable commercial queries that traditionally go to Google.”
The analyst also warned that if OpenAI can develop a “conversational” ad format, where users research and discuss potential purchases within ChatGPT, that could prompt advertisers to shift some of their marketing budgets because this is “high-intent engagement.”
Even if ChatGPT goes all-in on ads, though, don’t expect the chatbot to take Google’s share of the market overnight, Mahaney added.
OpenAI will still have to compete with the tech ecosystem that Google has spent years creating, such as its Chrome web browser, as well as web users’ habit of Googling stuff when they need an answer, Mahaney wrote.
