GPT-OSS, an open-source language model project, has reached a milestone with the release of GPT-OSS-120B, a 120-billion parameter model. The project has been described as "liberated" and now truly open source, indicating full public accessibility. Support for GPT-OSS is planned for January, with ongoing progress updates being shared. Early versions such as GPT-OSS-20B have demonstrated reasoning capabilities, and the foundational elements of GPT-OSS are now established. The project has attracted attention within the open-source AI community, with users sharing impressions and developments related to the model.