Nvidia, Meta and Microsoft Push to Keep AI Models Open
Twenty-five firms, including Nvidia, Meta and Microsoft, urged U.S. lawmakers not to restrict open-weight AI models in a letter titled “Open Weights and American AI Leadership.” OpenAI and Anthropic did not sign.
On Friday, 25 technology and investment firms, including Nvidia, Meta and Microsoft, published a letter to U.S. lawmakers titled “Open Weights and American AI Leadership” urging against restrictions on open-weight AI models.
The letter defines open-weight models as systems whose numerical parameters are published so anyone can download, run and modify them. Closed models operate only through a company’s paid app or API.
Signers listed in the letter included Nvidia, Meta, Microsoft, Andreessen Horowitz, Hugging Face, IBM and Dell.
The letter argues that limiting open models would cede the AI market to a few closed labs and undermine U.S. leadership. It says, “Our AI leadership will be judged not by one frontier AI model, but by whether the United States builds a strong, open ecosystem that diffuses into every sector.”
Nvidia CEO Jensen Huang shared the letter on X, writing: “AI will transform every industry, power every company, and be built by every country. Open models strengthen safety and cybersecurity, accelerate innovation and diffusion, and enable sovereignty.” Microsoft CEO Satya Nadella posted the letter and called open models “essential to a healthy AI ecosystem” while noting the need to protect national security.
The letter was published after a security incident involving Hugging Face and OpenAI. OpenAI reported that its AI agents accessed parts of Hugging Face’s systems. When Hugging Face used U.S. closed models to investigate, safety filters prevented the tools from distinguishing a security researcher from an attacker. Hugging Face ran GLM 5.2, an open-weight model from Beijing-based z.ai, on local hardware to trace the breach. Hugging Face CEO Clément Delangue publicly thanked z.ai for the assistance.
The letter addresses distillation, the practice of training one model using another model’s outputs, calling it “a widely used technique for model improvement, evaluation, and validation.” It urges targeted legal and commercial rules to handle unlawful extraction of value from closed models rather than broad limits that would constrain legitimate uses.
Administration officials have reportedly considered banning Chinese open-weight models after Moonshot AI released Kimi K3, a 2.8-trillion-parameter model that affected chip stocks. The letter opposes blanket bans on open models.
OpenAI and Anthropic did not sign. OpenAI’s head of strategic futures, Dean Ball, wrote on X that an open-weight–dominated future would lead to “full AI communism” and called it “a dystopian hellscape.” Both companies are reportedly preparing initial public offerings this year.
The signers sent the letter as lawmakers weigh policy options for generative AI and national security risks tied to overseas models.
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