Add ODean v21 submission

[kprofundis]

Adds the ODean v21 detector submission.

Files under leaderboard/submissions/ODean-v21/:

• predictions.json — 672,000 predictions, one per RAID test row (id + score), every test id covered exactly once, no duplicates.
• metadata.json — per leaderboard/template-metadata.json.

[github-actions]

Eval run succeeded! Link to run: link

Here are the results of the submission(s):

ODean v21

Release date: 2026-05-17

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 87.91 and a TPR of 64.56% at FPR=5% and 53.06% at FPR=1%.
Without adversarial attacks, it achieved AUROC of 89.56 and a TPR of 66.70% at FPR=5% and 54.49% 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!