OpenAI has signed a Microsoft-led open letter supporting open-weight AI models, marking a significant departure from its previous stance on closed AI systems. The letter, titled « Open Weights and American AI Leadership », has attracted 25 organizational signatories including NVIDIA, Meta, Palantir, and Hugging Face. OpenAI released its gpt-oss model family on August 5, 2025, featuring the gpt-oss-120B and gpt-oss-20B variants under the Apache 2.0 license. The letter argues that open-weight models are essential for maintaining US AI dominance, enhancing safety, and accelerating innovation. Notably, Anthropic and Google were absent from the signatories list.
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