Anthropic's IPO filing renews a no-ads pledge for Claude while showing a $147 million ad bill
The S-1 shows Anthropic's own advertising spend rose from $33 million in 2024 to $147 million in 2025, per Digiday.
In brief
Claude stays ad-free, Anthropic buys $147M of ads
Anthropic's IPO filing restates that Claude will never show ads. The same filing shows Anthropic spent $147 million on advertising in 2025, up from $33 million in 2024.
Anthropic filed a Form S-1 with the SEC on October 26, 2026, seeking a Nasdaq listing under the ticker ANT. A founders' letter in the filing restates that Claude, its chatbot, will stay free of advertising.
The Information reports that seven co-founders signed the letter. Their reasoning, as reported by The Information and Digiday: ad revenue targets would push a chatbot to chase engagement instead of giving helpful answers.
Claude's no-ads pledge means its income depends on being useful, not on selling attention.
A pledge made before
This is not a new promise. The Register and Digital Applied report that Anthropic first made it in a February 4, 2026 essay titled 'Claude is a space to think'.
The company is a big advertiser
The same filing shows Anthropic buys a lot of ads. Digiday reports advertising spend of $147 million in 2025, up from $33 million in 2024. By Digiday's comparison, that is more than Duolingo's $125.7 million in total sales and marketing for 2025.
The S-1 ties the 2025 rise to higher media and public relations spend for product launches. Digiday notes that in 2023 the spend was so small the filing called it not material.
Where the sources differ
The measures are not identical. Digiday cites total advertising spend. Other outlets, bestmediainfo and digitaltoday.co.kr, citing the filing, report year-on-year increases in marketing and advertising expenses of $170 million for 2025 and $273 million for the first half of 2026.
Compute commitments also differ. PPC Land reports at least $269 billion owed to Amazon, Google and Microsoft. mi-3 reports $265.6 billion in fixed or minimum purchase commitments.
Why it matters
Digiday reports that Anthropic earns mostly from usage fees, billed like an electricity meter: $13.1 billion of $16.3 billion in first-half 2026 revenue. More use means more money. So the no-ads promise means Claude's income depends on people finding it useful, not on selling their attention. Whether that holds under public-market pressure is a fair question for any reader.
What comes next
StockTitan reports the earliest roadshow date under SEC staff practice is November 10. TheDesk.net and mi-3 report the offering size and price are not yet disclosed.
The limits: the pledge is a statement of intent in a letter, and the sources show no binding mechanism. The excerpts also do not settle which ad-spend measure is the standard one.