Jensen Huang made his first-ever X post on Friday, sharing an open letter signed by 25 companies including Nvidia, Microsoft and Palantir, warning Washington not to repeat the mistake of over-restricting technology the way some feared for open-source software in the 1980s. The letter argued instead that open-weight AI models should be preserved as a foundation for American leadership, suggesting that Huang and his ilk genuinely fear that they won't be. "Open models strengthen safety and cybersecurity, accelerate innovation and diffusion, and enable sovereignty," Huang wrote. "The world needs both frontier closed models and frontier open models." The post lands as Washington debates whether to restrict Chinese open-weight models like Moonshot AI's Kimi K3, which was released July 16 and ranks among the most capable models anywhere.