REDACT: A Systematically Controlled Multilingual Benchmark for Personal Information Detection

Guneesh Vats; Anubha Agrawal; Shikha Singhal; Ajita Dash; Praison Selvaraj; Vidhan Jhawar; Ranga Prasad Chenna; Bharadwaj Y M G

arXiv · 2606.19881

REDACT: A Systematically Controlled Multilingual Benchmark for Personal Information Detection

Guneesh Vats·Anubha Agrawal·Shikha Singhal·Ajita Dash·Praison Selvaraj·Vidhan Jhawar·Ranga Prasad Chenna·Bharadwaj Y M G

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Abstract

Benchmark infrastructure for personally identifiable information (PII) detection remains limited: existing corpora cover few entity types, use ad hoc generation conditions, and do not show which surface conditions cause detector failures. We present REDACT, a systematically controlled multilingual PII benchmark with 13,427 records, 324,078 entity annotations, 51 entity types, 4,127 surface-form patterns, and 25 languages across 9 scripts. A strength-2 covering-array sampler controls nine generation axes: domain, format, difficulty, length, density, code-switching, language, adjacency, and co-occurrence. Three entity-level metadata fields (disclosure status, disclosure form, and a GDPR-aligned sensitivity tier) enable stratified evaluation beyond aggregate or per-type F1. From the full benchmark, we evaluate five detectors (Presidio, GLiNER, the OpenAI Privacy Filter, GPT-4.1, and Claude Sonnet 4.6) on a locked, language-stratified sample of 1,000 records. Aggregate F1 masks an architecture-dependent failure structure: the rule-based detector performs poorly on the highest-stakes data, including HIGH-sensitivity categories (recall 0.07) and non-verbatim disclosure forms, while the LLM detectors remain more robust, with the HIGH tier as their strongest sensitivity slice. A three-model reference-free LLM-as-judge assessment corroborates that sensitivity-tier assignment is the task's hardest axis. We release the benchmark, schema, prompts, and stratified evaluation harness.

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BibTeX RIS

Guneesh Vats, Anubha Agrawal, Shikha Singhal, Ajita Dash, Praison Selvaraj, Vidhan Jhawar, Ranga Prasad Chenna, Bharadwaj Y M G. 2026-06-18. REDACT: A Systematically Controlled Multilingual Benchmark for Personal Information Detection. https://arxiv.org/abs/2606.19881

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