PII Arena
ONNX detector

nym-small PII detection benchmark

Measured on 38 of 41 retained datasets under the same frozen scoring and masking protocol.

62.82%fully hidden annotations
81.01%detected / overlapped
9.82%extra masking
CPU characters / second

Strengths

Highest complete-masking rates by normalized data type.

Dates & times90.00%2,161 / 2,401
Logins & usernames85.72%9,273 / 10,818
Phone numbers & email82.37%16,274 / 19,756

Watch list

Lowest observed complete-masking rates; inspect before deployment.

Network identifiers22.87%5,792 / 25,323
Other sensitive attributes28.96%819 / 2,828
Customer & employee IDs45.83%3,127 / 6,823

Language coverage

The overall leader can differ from the best choice for one language slice.

LanguageDatasetsFully hidden ↑Detected ↑Extra masking ↓
English1673.44%86.02%11.33%
Russian1860.40%80.00%6.67%
Multilingual461.61%80.07%1.68%

Configuration, source and version

Family
ONNX
Revision
4348999cd3c2e20c49615e9af7c6bbb45b64cd85
Eligible datasets
38 / 41
Character F1
0.673
Untouched diagnostic
18.99% · 39,158 / 206,216
Benchmark version
1.0.3 · 2026-09-09
CPU seconds / 10k chars
Not measured
GPU seconds / 10k chars
Not measured

source overlap: nym-ru, nym-en, nym-multi

Results by dataset

Complete masking is primary; detection shows whether any character overlapped.

DatasetGold annotationsFully hidden ↑Detected ↑Extra masking ↓
rubai-ru3,4585.00%98.26%
alexen21,26110.23%96.99%12.49%
alrosait1,86217.83%98.50%4.65%
multiconer-ru1,20820.03%29.88%5.03%
synth-jira-comments2,70535.97%69.94%
synth-ru-tickets32,09938.40%55.48%
ameau012,24238.40%55.66%1.85%
leak-museum10138.61%48.51%4.00%
tab-echr3,83044.26%77.13%
gretel-multi4,48446.83%82.67%1.68%
jayguard1,19548.79%78.49%2.66%
dialogpii-multi10,34551.45%67.96%
synth-env-configs39251.53%97.19%28.19%
corrupt-secrets-issues28855.90%95.83%7.31%
synth-secrets-en58157.31%93.29%30.86%
redact-multi22,86457.85%79.33%
dialogpii-en3,08758.28%77.97%3.83%
redact-ru9,23059.90%82.77%8.67%
leaky-repo9560.00%88.42%6.94%
synth-secrets-ru58160.93%94.49%32.58%
tonicai2,41762.02%64.75%0.28%
corrupt-redmadrobot5,53162.34%78.47%2.21%
corrupt-hivetrace1,66762.87%95.08%1.68%
secrets-issues28867.01%97.92%7.56%
scanpatch8,70871.30%89.62%1.33%
synth-wiki-tables13,09474.50%96.27%
redmadrobot5,51675.49%84.95%2.03%
hivetrace1,66775.94%99.10%0.34%
nerel24,36976.38%88.47%
secrets-rules74679.09%97.32%46.28%
privy1,89979.09%93.26%11.13%
nemotron-pii9,39183.19%90.55%5.22%
creddata77683.76%98.07%14.27%
factrueval7,96684.70%86.32%
kiji-multi7,56595.64%97.30%
kiji-en7,62396.09%97.74%
arthur-passwords28099.29%99.29%16.60%
russian-pii-66k4,80599.42%99.71%