OpenAI Releases First Open-Weight Models Since GPT-2

OpenAI has released two open-weight language models, marking the startup's first such release since GPT-2 in 2019. The models, gpt-oss-120b and gpt-oss-20b, can run locally on consumer devices and be fine-tuned for specific purposes. Both models use chain-of-thought reasoning approaches first deployed in OpenAI's o1 model and can browse the web, execute code, and function as AI agents.

The smaller 20-billion-parameter model runs on consumer devices with 16 GB of memory. Gpt-oss-120B model will require about 80 GB of memory. OpenAI said the 120-billion-parameter model performs similarly to the company's proprietary o3 and o4-mini models. The models are available free on Hugging Face under the Apache 2.0 license after safety testing that delayed their March announcement.

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