Open-Weight AI: The GPT-OSS 120B & 20B Breakthroughs

In this Deep Dive, we unpack OpenAI’s August 5, 2025 release of open-weight language models GPT-OSS 120B and GPT-OSS 20B. We explore how mixture-of-experts design, edge-friendly memory footprints, and the Harmony reasoning framework deliver near-parity with top proprietary models at a fraction of the cost—along with safety, privacy, and governance implications of open weights. What this means for developers, startups, and researchers, and how to get started with the models on Hugging Face and OpenAI’s playground.

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