OpenAI starts testing ads in ChatGPT

Background

By February 2026 ChatGPT had about 900 million weekly active users ^[1]. A free service at that scale is expensive to run: every conversation consumes computing power, and users on a free tier pay nothing. Advertising is the usual way consumer internet products cover that cost — the service stays free, and the bill is paid by advertisers rather than by users.

OpenAI's reported revenue expectations, by contrast, rested on recurring subscription income. The company was reported to expect annualised recurring revenue above $20 billion by the end of 2026 ^[4]. Annualised recurring revenue (ARR) quotes subscription income as though the current rate continued for a full year; it is a snapshot of a rate, not a record of money already received.

The announcement

In January 2026 OpenAI announced that it would test advertising in ChatGPT for free, logged-in adult users in the United States ^[1][4]. Reports of the announcement were dated 16 and 17 January 2026 ^[1][4].

The tests were to run in the United States in ChatGPT's Free and Go tiers, with the rollout described as coming within weeks ^[3]. OpenAI said ads would be shown to U.S. adults with free accounts in the coming weeks ^[4], and that they would also be displayed to users with a ChatGPT Go subscription ^[4]. Go is a subscription tier, so advertising was not confined to people who pay nothing: subscribers would see ads as well.

Ads appear

Ads began appearing in ChatGPT in March 2026 ^[1]. By then the free product was no longer only a product supported by paid subscriptions; it also carried commercial messages of its own.

Revenue

In April 2026 OpenAI's projected advertising revenue for the year was about $2.5 billion ^[2]. By August 2026 the ad business had reached a $1 billion annualised run rate ^[1][2].

A run rate takes revenue from a recent period and scales it up to a full year, so it describes the pace of a business at a given moment rather than the total it will actually collect over twelve months. A $1 billion annualised run rate in August and a $2.5 billion projection for the whole year are therefore different kinds of number, and both can be true at once as an ad business grows through its first year.

Why it matters

Advertising changes how the free tier is paid for. Instead of asking hundreds of millions of users to subscribe, OpenAI could let them use ChatGPT at no charge and earn from advertisers instead ^[1]. For a service whose costs rise with every conversation, that is one route to keeping a free tier open as the user base grows.

It also changes what kind of business ChatGPT is. The figures reported around the launch describe two streams running side by side: recurring subscription revenue, expected to exceed $20 billion annualised by the end of 2026 ^[4], and advertising, which went from tests to a $1 billion annualised run rate between March and August 2026 ^[1][2].

Putting ads into a question-and-answer assistant also raises design questions that a social feed does not. In a feed, users can usually tell a promoted post from an ordinary one; in a conversation, commercial content and the model's answer sit in the same place, and the product has to make the difference visible. How that boundary is drawn will shape how much users trust what the assistant says.