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OpenAI returns to open source roots with new models gpt-oss-120b and gpt-oss-20b
Enterprises can use a powerful, near topline OpenAI LLM on their hardware totally privately and securely, without sending data to the cloud.
In keeping with Chinese competitors and counterparts, any consumer, developer, independent entrepreneur or enterprise large and small is empowered by the Apache 2.0 license to be able to download the new gpt-oss models at will, fine-tune and alter them to fit their specific needs, and use them to generate revenue or operate paid services, all without paying OpenAI a dime (or anything! These included filtering chemical, biological, radiological, and nuclear threat (CBRN) related data out during pretraining, and applying advanced post-training safety methods such as deliberative alignment and an instruction hierarchy to enforce refusal behavior on harmful prompts. While OpenAI has not committed to a fixed cadence for future open-weight releases, it signals that gpt-oss represents a strategic expansion of its approach — balancing openness with aligned safety methodologies to shape how large models are shared and governed in the years ahead.
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