I ran Anthropic's 335-page IPO filing through an AI-writing detector. Well, well, well…

What happened: Business Insider ran Anthropic's 335-page S-1 filing through Pangram, an AI-writing detector, after the filing landed. Pangram CEO Max Spero ran the full file and reported the result. Key numbers: 92% of the filing was flagged as human-written; the filing totals 259,031 words across 335 pages. Why it matters: Spero said the result suggests light AI editing at the sentence level rather than fully AI-generated sections. The article questions whether Anthropic should rely more on its own Claude for such work, while noting the high stakes of SEC review. Coverage: 8 outlets in 24h

Business Insider ran Anthropic's 335-page S-1 filing through Pangram, an AI-writing detector, after the filing landed. Pangram CEO Max Spero ran the full file and reported the result.

Spero said the result suggests light AI editing at the sentence level rather than fully AI-generated sections. The article questions whether Anthropic should rely more on its own Claude for such work, while noting the high stakes of SEC review.