Claude won’t be carrying ads when Anthropic goes public. Plenty of them will be carrying Claude. The paperwork ( S-1 document ) the AI company filed with U.S. regulators before its stock market listing shows its advertising spend rising from $33 million in 2024 to $147 million last year. That’s more than Duolingo, an app that has built its brand on marketing, spent on sales and marketing combined in 2025, at $125.7 million. Anthropic’s spending kept rising this year, with marketing and advertising costs up another $273 million more on marketing and advertising than in the same six months a year earlier. That still leaves the ad budget small…
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