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gpt-oss-safeguard technical report

OpenAI just released two open-weight reasoning models purpose-built for content moderation at scale.

Reporting by OpenAI Blog 1 min brief
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The KeyNews take

Why it matters

OpenAI is releasing gpt-oss-safeguard models (120B and 20B parameters) designed to apply custom safety policies to content at scale. This signals a shift toward open-sourcing safety infrastructure—traditionally a closed competitive advantage—and democratizing policy-driven content classification for enterprises.

The key facts

6 to know

  1. Two model sizes released: gpt-oss-safeguard-120b and gpt-oss-safeguard-20b

  2. Open-weight models (not closed API)

  3. Post-trained from gpt-oss base models for reasoning capability

  4. Designed for policy-driven content labeling

  5. Includes baseline safety evaluations against underlying gpt-oss models

  6. Published October 29, 2025

Go to the source

OpenAI Blogopenai.com

Publisher excerpt: gpt-oss-safeguard-120b and gpt-oss-safeguard-20b are two open-weight reasoning models post-trained from the gpt-oss models and trained to reason from a provided policy in order to label content under that policy. In this report, we describe gpt-oss-safeguard’s capabilities and provide our baseline…
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