No Ads in Claude: Anthropic Pledges to Keep It That Way... While the Startup Burns Through Billions of Dollars

Anthropic’s IPO filing, made public on Monday, October 26, contains a letter signed by its seven founders, including CEO Dario Amodei and his sister Daniela, who chairs the company. In it, they pledge in black and white that Claude, their AI assistant, will remain ad-free.The announcement lands two weeks into the investor roadshow, expected during the week of November 9.

From the Super Bowl to the market watchdog

Anthropic had already promised this back in February, on a completely different medium. On the 4th of the month, the company published a post that became famous: “There are many good places for advertising. A conversation with Claude is not one of them”. Four days later, two Super Bowl commercials, one aired before kickoff, the other during the game itself, hammered home the slogan “Advertising is coming to AI. But not in Claude”, in direct response to OpenAI, which had just opened ChatGPT to advertisers.

In the letter attached to the prospectus, the founders reiterate the argument almost word for word: “As soon as advertising becomes a revenue objective for a company, the pressure to optimize engagement tends to increase”. Claude’s only incentive, they write, should be to provide useful answers. Daniela Amodei went further in February, arguing that advertising exploited the intimate nature of the conversations entrusted to these assistants. The company argued at the time that this personal nature would make any advertisement “incongruous”, or even inappropriate in many cases.

Whereas February's jab was opportunistic marketing, the decision set out in the prospectus is an entirely different matter: a document of this kind binds its signatories before the U.S. regulator and investors, whereas a blog post could quietly be deleted. And those signatories will retain control, since a Class F share entitles them to 50.1% of the voting rights after the transaction.

An $80 billion loss-making wager

The same prospectus quantifies the damage: $16.3 billion in revenue in the first half of 2026, for a net loss of $80.7 billion over the same period, including $72.4 billion in accounting charges related to fundraising rounds. Revenue has since accelerated further, reaching $16.8 billion in the third quarter alone. The deal is targeting a valuation of around $2 trillion, making it one of the largest IPOs in history.

The model being touted as able to thrive without the advertising windfall: business contracts and paid subscriptions, with the revenue reinvested in improving Claude. Meanwhile, OpenAI, xAI, and Google are all moving toward advertiser-funded answers.

On the eve of the deal, the promise also serves as a sales pitch, since it distinguishes Claude from ChatGPT in the eyes of both investors and the general public.Moreover, the document does not devote a single line to what the advertising would report.

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Source: Anthropic