OpenAI launches advertising in ChatGPT, crossing the line Sam Altman called a 'last resort'

Sam Altman once called advertising in AI products "uniquely unsettling" and a "last resort" for OpenAI 1. Then the gap between that promise and the outcome began closing, slowly at first, then all at once.

OpenAI started testing ads inside ChatGPT earlier this year 2. In spring 2026, it launched a self-serve platform letting brands buy campaigns directly 3. Now the program has expanded to seven markets with Best Buy, Lowe's, and VistaPrint already running campaigns 1. Each step took the product closer to the model Altman said he wanted to avoid. Each step happened anyway.

Advertise in ChatGPT lets brands target free-tier users based on the substance of their conversations rather than the keywords they type 1. Ads appear as sponsored suggestions below ChatGPT's responses, visually separated from the model's own output 1. They reach only free-tier users and lower-cost paid subscribers. Anyone on Plus, Pro, or a Business plan sees nothing 1.

The tier structure tells you what this launch is really about. OpenAI is ring-fencing paying customers from ad exposure while opening a substantial inventory stream on its free tier. The company reports more than 900 million weekly active users, and independent traffic analysis consistently ranks chatgpt.com among the five most-visited websites globally 1. Even with subscribers removed, the audience available to advertisers exceeds what most ad platforms build over years.

The mechanics will feel familiar to anyone who has bought a Google or Meta ad. Advertisers set budgets, upload creative, and launch. OpenAI's selling point is targeting depth: users reveal more explicit intent in conversation than in a short search query, so ads can match against context rather than guesswork 1. Best Buy's VP of Media, Amy Adams, framed the appeal as reaching customers during research and decision-making moments that increasingly happen inside a chat window rather than a search bar 1.

The expansion spans the United States, United Kingdom, Canada, Australia, Japan, Korea, and New Zealand 1. OpenAI describes the program as testing and states that ads will be clearly labeled, run on separate systems from the chat model, and will not influence ChatGPT's responses 1. Those three commitments will sound familiar to anyone who watched ad-supported search evolve over two decades.

The spine of this story is what Altman said in 2024. He called advertising combined with AI "uniquely unsettling" to him personally and described ads as a "last resort" for OpenAI's business model, one he would accept only if it were the only way to give everyone access to great services 1. OpenAI has not published a statement explaining why that threshold was reached 1.

The economic logic is not mysterious. Serving hundreds of millions of free-tier users costs real money in compute, and an ad-supported tier is the established model for platforms that fund a large non-paying population 1. OpenAI has not published an updated annualized revenue figure since a reported run-rate of roughly $25 billion earlier in 2026, a silence some observers read as a sign of growth pressure, though that interpretation remains speculative 1.

For investors, the signal is straightforward. Opening ads on a product with 900 million users tells you subscription revenue alone is not projected to carry the load. This is diversification, not desperation, but the direction is what counts. OpenAI is now in the advertising business.

For competitors, the harder question is whether they can afford not to follow. Anthropic, Google, and Meta each operate AI chat products with large free-tier audiences and the same inference-cost pressures that drove OpenAI to this point.

For users, the shift is more personal. ChatGPT has built its position as a tool people rely on for work, learning, and decisions. The implicit promise has been that its answers serve the person asking. Sponsored suggestions below those answers introduce a second party with a stake in what users see. OpenAI's structural firewalls (separate systems, no influence on responses, clear labeling) exist on day one. The real test is what happens when ad revenue becomes a line item someone at OpenAI is accountable for growing.

Altman called ads a last resort. The resort has arrived, and the bill for serving the world for free is finally coming due.