OpenAI Quietly Drops Two Powerful Open-Weight AI Models Days Before GPT-5 Launch

OpenAI quietly releases two powerful open-weight AI models, GPT-OSS-120B and GPT-OSS-20B, just days before GPT-5 launches, offering state-of-the-art reasoning capabilities under a permissive Apache 2.0 license — with the smaller model running on a standard laptop with just 16GB of RAM.

• OpenAI quietly releases two open-weight models, GPT-OSS-120B and GPT-OSS-20B, just days before launching GPT-5, offering state-of-the-art Mixture-of-Experts reasoning capabilities under the permissive Apache 2.0 license.
• The models are designed to meet regulatory and security needs by running locally — GPT-OSS-20B operates on as little as 16GB of RAM on a standard laptop, while GPT-OSS-120B rivals proprietary models and runs efficiently on a single 80GB GPU.
• Despite their capabilities, the GPT-OSS models remain under the radar partly because they favor reinforcement learning over supervised fine-tuning, making them harder to customize than competing open models from rivals like DeepSeek, Qwen, and Google.