OpenAI Releases Privacy Filter: A 1.5B-Parameter Open-Source PII Redaction Model with 50M Active Parameters

MarkTechPost / 4/29/2026

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OpenAI has released “Privacy Filter,” an open-source PII redaction model with 1.5B parameters designed to detect personally identifiable information.
The model uses a “distilled decoder” architecture to improve efficiency while maintaining PII detection capabilities.
OpenAI says the filter can run directly in the user’s browser, enabling on-device redaction rather than relying solely on server-side processing.
The release highlights that only about 50M parameters are actively used during operation, suggesting a focus on practical deployment performance.
This update provides developers and organizations with a new building block for privacy-preserving AI workflows and data handling.

OpenAI's Privacy Filter Is a 1.5B-Parameter PII Detector Built on a Distilled Decoder — And It Runs in Your Browser

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