OpenAI launches two open-weight language models optimised for local use and advanced reasoning

OpenAI has introduced two innovative open-weight language models intended for local deployment on personal computers. These models promise performance that rivals the company’s smaller proprietary reasoning models and represent OpenAI's first release of open-weight models since the launch of GPT-2 in 2019. Unlike traditional open-source models, open-weight models grant public access to trained parameters without revealing the complete source code or training data. This unique approach enables developers to customize the models for specific applications without needing the original datasets. During a recent press briefing, OpenAI co-founder Greg Brockman emphasized the advantages of open models, noting, "One of the things that is unique about open models is that people can run them locally. People can run them behind their own firewall, on their own infrastructure." The two newly released models, gpt-oss-120b and gpt-oss-20b, cater to different hardware environments. The larger gpt-oss-120b is capable of running on a single GPU, while the smaller gpt-oss-20b is optimized for personal computers. Both models are reported to perform on par with OpenAI’s proprietary reasoning models, o3-mini and o4-mini, excelling in areas such as coding, competitive mathematics, and health-related inquiries. They were trained using a text-only dataset focused heavily on science, mathematics, and programming, alongside a breadth of general knowledge. While OpenAI has not released direct benchmark comparisons to other models, including China's DeepSeek-R1—known for its advanced reasoning—the response to these models has been positive. In a related announcement, Amazon revealed that OpenAI’s open-weight models are now accessible via its AWS Bedrock generative AI marketplace. Atul Deo, director of product for Bedrock, remarked on the quality of OpenAI's developments, stating, "OpenAI has been developing great models and we believe that these models are going to be great open-weight model options for customers," although specific details regarding the partnership have not been disclosed. This release occurs as OpenAI, supported by Microsoft and valued at approximately $300 billion, aims to secure up to $40 billion in an upcoming funding round led by SoftBank Group.