OpenAI Privacy Filter

Skill by ara.so — Daily 2026 Skills collection.

OpenAI Privacy Filter is a bidirectional token-classification model (1.5B params, 50M active) for detecting and masking PII spans in text. It runs in a single forward pass with constrained Viterbi decoding, supports a 128k-token context window, and is licensed Apache 2.0.

Installation

pip install -e .
# or from a cloned repo:
git clone https://github.com/openai/privacy-filter
cd privacy-filter
pip install -e .

After install, the opf CLI is available. On first use it downloads the model checkpoint to ~/.opf/privacy_filter unless OPF_CHECKPOINT is set.