Jensen Huang initiates, Elon Musk reposts: NVIDIA and more than 20 tech companies co-sign an open letter supporting open-weight AI models.

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Nvidia, Microsoft, Meta and 25 other US tech companies have jointly issued a letter warning policymakers not to impose "premature restrictions" on open-weight AI models.

Nvidia CEO Jensen Huang and Microsoft CEO Satya Nadella both shared the open letter on their personal social media, showing a clear stance for their respective companies on this sensitive policy issue. Elon Musk also commented on X, saying he "fully supports" the content of the letter.

However, both OpenAI and Anthropic, each valued close to $1 trillion and preparing for IPO, did not sign the letter.

OpenAI CEO Sam Altman said on Friday that he hopes the US will win in the open-source AI field and also hopes to succeed in proprietary AI models. He is "pleased" by Nvidia CEO's comments on social media regarding the open letter jointly issued by over 20 US tech companies.

25 Companies Jointly Draw a Red Line: Restricting Open Source Is "The Wrong Prescription"

The 25 tech companies emphasized in the open letter that open-weight models help reinforce competition and ensure that the dividends of AI technology are "widely shared rather than concentrated in the hands of a few."

The letter also refutes the claim that "open means unsafe," pointing out that simply relying on closed-source models is "not inherently safer"—such models may also be hacked, abused, or fail in ways invisible to outsiders, and concentrating advanced AI capabilities behind a few closed models only worsens these risks.

In response to concerns about illegal distillation, these companies advocate for addressing this through "targeted legal and business frameworks" rather than adopting "blanket restrictions" on technologies critical to AI innovation.

The letter states: "America's AI leadership should not be judged by any single frontier model, but by whether the US can build a strong, open ecosystem—and make it permeate across industries."

OpenAI and Anthropic Did Not Join the Joint Letter; Altman Expresses Support

It is noteworthy that the two most representative closed-source AI companies, OpenAI and Anthropic, did not join the joint letter, with their commercial interests clearly visible—their core strategy is to develop proprietary closed models, and both are preparing for potentially massive IPOs.

Nevertheless, OpenAI CEO Sam Altman said on Friday that he hopes the US will win in the open-source AI field and also hopes to succeed in proprietary AI models. He is "pleased" by Nvidia CEO's comments on social media regarding the open letter by over 20 US tech companies.

Meanwhile, OpenAI President Greg Brockman stated at a media briefing in New York on Thursday that the company believes AI should be broadly accessible. "Fundamentally, AI and its use are things that truly need to be democratized," Brockman said. "More models, more use, to me, are a good thing."

This means that, although OpenAI did not sign the letter, its policy positions are not fundamentally opposed to those of the signatories; the lack of signature is more likely due to business strategy rather than a difference in principles.

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