Despite what its name suggests, OpenAI hadn’t released an “open” model—one that includes access to the weights, or the numerical parameters often described as the model’s brains—since GPT-2 in 2020.

Open artificial intelligence models that developers are able to use with few or no restrictions are critical to a competitive market in the rapidly evolving technology, a senior Justice Department ...

The company has unveiled two new open-weight language models, gpt-oss-120b and gpt-oss-20b, marking the firm's first public release of freely available AI model weights since GPT-2 in 2019, long ...

Living up to its name, OpenAI has released not one but two new open-weight AI models after promising to deliver a new open-weight model earlier this year. The two models, gpt-oss-20b and gpt-oss-120b, ...

When DeepSeek released its DeepSeek reasoning model in early 2025, it tanked the US stock market. The Chinese startup showed a new way of training frontier AI that didn't rely on access to expensive, ...

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 ...