# Ai2 — Tracing distinctive language in AI-written text

- Company: Ai2 (allenai.org)
- Announced: 2026-07-31
- Category: research-paper
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://allenai.org/blog/infinigram-books
- Record: https://forck.live/items/18542-tracing-distinctive-language-in-ai-written-text
- Subject: Olmo / Molmo / Asta

Ai2's infini-gram engine was used by researchers to analyze AI-generated books on Amazon, finding that books with substantial detected AI text contain more rare expressions from existing books than those without. Among the top 200 highest-revenue books in each group, those with substantial detected AI text had 4.4 percentage points more rare expressions from existing books, a gap that widened to 22.5 points when compared with award-winning or nominated literature.

## Evidence

Verbatim from https://allenai.org/blog/infinigram-books:

> Among the 200 highest-revenue books in each group, those with substantial detected AI text contained 4.4 percentage points more rare expressions from existing books. The gap widened to 22.5 points when compared with award-winning or nominated literature, suggesting that AI-heavy bestsellers draw more heavily on distinctive language from earlier works.

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Record: https://forck.live/items/18542-tracing-distinctive-language-in-ai-written-text
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