Microsoft is making OpenAI’s new free and open GPT model, gpt-oss-20b, available to Windows 11 users via Windows AI Foundry, the tech giant’s platform that lets users tap AI features, APIs, and popular open-source models on their computers. The company said in a blog post that gpt‑oss-20b is “tool-savvy and lightweight,” adding: “Optimized for agentic tasks like code execution and tool use, it runs efficiently on a range of Windows hardware, with support for more devices coming soon. It’s perfect for building autonomous assistants or embedding AI into real-world workflows, even in bandwidth-constrained environments.” Launched on Tuesday, OpenAI’s gpt-oss-20b can run on consumer PCs and laptops with at least 16GB of VRAM, which a modern GPU from Nvidia or Radeon would have. OpenAI said the model was trained using high-compute reinforcement learning, which helps it excel at powering AI agents and call tools, such as web search or Python code execution, as part of its chain-of-thought process. However, the model is text-only, meaning it will not be able to process or generate images and audio like the company’s other models. Also, the model has a habit of hallucinating a lot: gpt-oss-20b hallucinated in response to 53% of questions on PersonQA, OpenAI’s in-house benchmark for measuring the accuracy of a model’s knowledge about people.

Full report : Microsoft brings OpenAI’s smallest open model to Windows users.