OpenAI signs open letter advocating for open-weight AI models, marking a major strategic pivot

The shift aligns with a broader industry push, spearheaded by a Microsoft-led open letter titled “Open Weights and American AI Leadership,” which has attracted 25 organizational signatories including NVIDIA, Meta, Palantir, and Hugging Face. The letter argues that open-weight models are essential for maintaining US dominance in AI, enhancing safety, and accelerating innovation. From closed shop to open doors OpenAI released its gpt-oss family of models on August 5, 2025, which included the gpt-oss-120B and gpt-oss-20B variants. These models were designed for local use on consumer devices and released under the Apache 2.0 license, made available on platforms like Hugging Face and GitHub. The Microsoft-led letter makes a pointed argument about national security and competitiveness. With Chinese AI labs releasing increasingly capable open-weight models, the letter contends that restricting open-weight development in the US would effectively hand a strategic advantage to foreign competitors. The policy battle behind the signatures The letter emerged against the backdrop of active US policy discussions about whether to impose restrictions on certain open-weight models, particularly thos...