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IdeaShift-X
IdeaShift-X tests idea-provenance detection outside English. It holds about 10,000 human-written web pages in 24 languages from FineWeb2. Each page has two AI versions in the same language, written by Gemini 3.7 Flash:
- Level 0: written from a brief naming only the document type, so the ideas are the AI's.
- Level 5: written from the page's full role-labelled outline with an instruction to add nothing, so the ideas are the page's and the prose is the AI's.
A detector should not flag the human pages. It should flag level 0 for AI ideas. An idea detector should not flag level 5; a prose detector should.
Construction
The dataset merges two builds.
- 9-language build: Arabic, Chinese, German, Indonesian, Japanese, Russian, Spanish, Tamil, Urdu. About 610-740 pages per language.
- 24-language build: adds 15 languages at about 250 pages each.
Pages were format-classified with WebOrganizer's annotation prompt on an LLM. Only pages in the eight long-form formats IdeaLens was trained on were kept, some of them force-fitted to the closest format. Outlines are always extracted in English, whatever the page's language.
Fields
| Field | Description |
|---|---|
id |
<language>#<FineWeb2 id> for human pages; …|level0 / …|level5 for AI versions |
seed_id |
the human page the row belongs to |
language, language_name |
FineWeb2 language code and name |
build |
9-language or 24-language |
level |
null for the human page; 0 or 5 for AI versions |
kind, prose_author, idea_author |
what the row is and who wrote its prose and ideas |
generator |
gemini-3.7-flash for AI versions |
format |
the page's format (WebOrganizer taxonomy, one of the eight long-form formats) |
words, text |
the document |
seed_crawl_dump, seed_crawl_date |
Common Crawl snapshot and crawl date of the human page |
Caveats
- URLs are not included. The FineWeb2 id identifies each page in the source dataset.
Scoring
The idealens package (PyPI) runs IdeaLens, ProseLens and the other released detectors on these documents: pip install idealens, then idealens run on a JSONL file with a text field.
License
The human pages come from FineWeb2 (ODC-By 1.0) and remain subject to the terms of their original sources and of Common Crawl. The AI versions were produced with Google Gemini models and are subject to Google's terms. Annotations are released under CC BY 4.0.
Citation
@article{idealens2026,
title = {IdeaLens: Detecting AI Ideas in Long-form Writing},
author = {Anonymous},
journal = {arXiv preprint arXiv:TBD},
year = {2026},
url = {https://arxiv.org/abs/TBD}
}
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