OpenAI released Privacy Filter, a 1.5B-parameter Apache 2.0 model that runs locally to detect and mask names, addresses, emails, dates and other PII before text ever reaches a cloud API. It offers high benchmark performance, a 128K token context window, and configurable precision-recall, helping startups meet GDPR and similar data-transfer rules. The article covers its architecture, real-world use cases, tuning steps and limitations around true anonymization.