// Hacker Noon · 22 April 2026

OpenAI Open-Sources Privacy Filter, a Tiny Model That Scrubs PII Without an API Call

OpenAI released Privacy Filter under Apache 2.0 — a 1.5B-parameter (50M active) bidirectional token-classification model that detects and masks PII in text locally, in a single forward pass. It runs on a laptop, supports 128K context, hits 96% F1 out of the box, and is fine-tunable with minimal data...

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