Add HandPenned detector submission

[russellsailors-hub]

Adds leaderboard/submissions/HandPenned/ with predictions.json (all 672,000 test ids, score in [0,1], higher = more likely machine) and metadata.json.

Detector: HandPenned (https://handpenned.com/), two fine-tuned DeBERTa-v3-large classifiers voting; trained on ~29k human and ~29k machine paragraphs across 23 genres, including a stratified slice of the RAID train split (disjoint from any evaluation set we use). Contact: support@handpenned.com.

🤖 Generated with Claude Code

[github-actions]

Eval run succeeded! Link to run: link

Here are the results of the submission(s):

HandPenned

Release date: 2026-09-05

I've committed detailed results of this detector's performance on the test set to this PR.

On the RAID dataset as a whole (aggregated across all generation models, domains, decoding strategies, repetition penalties, and adversarial attacks), it achieved an AUROC of 84.18 and a TPR of 91.33% at FPR=5% and 73.49% at FPR=1%.
Without adversarial attacks, it achieved AUROC of 83.13 and a TPR of 89.56% at FPR=5% and 72.80% at FPR=1%.

If all looks well, a maintainer will come by soon to merge this PR and your entry/entries will appear on the leaderboard. If you need to make any changes, feel free to push new commits to this PR. Thanks for submitting to RAID!

[russellsailors-hub]

Closing this — HandPenned has been discontinued and the project is no longer maintained, so the submission's links are no longer live. Apologies for the noise, and thanks for the work on RAID.