25 AI Heavyweights Tell Washington: Hands Off Our Open-Source Brain 🧠

Twenty-five companies, including Nvidia, Meta, Microsoft, Andreessen Horowitz, Hugging Face, IBM, and Dell, signed a letter published Friday titled "Open Weights and American AI Leadership," urging U.S. policymakers not to restrict open-weight AI models. Open-weight models are AI systems whose underlying model weights—the billions of parameters that shape how a model responds—are released publicly, allowing anyone to download, run, and modify them. This stands in contrast to closed models such as OpenAI's GPT or Anthropic's Claude, which are accessible only through company-controlled apps or APIs. The letter framed the debate as a modern parallel to the 1980s open-source software movement, arguing that American AI leadership will be judged not by a single frontier model but by whether the country builds "a strong, open ecosystem that diffuses into every sector."

Nvidia CEO Jensen Huang shared the letter in his first-ever post on X on July 24, 2026, 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 also reposted the letter, calling open models "essential to a healthy AI ecosystem" while protecting national security. The signatories urged policymakers to address concerns around open-weight models through targeted legal and commercial frameworks rather than sweeping restrictions, arguing that limits would simply concentrate the AI market in a handful of closed labs.

The letter lands weeks after a separate incident that underscored the stakes. OpenAI confirmed that its own AI agents had broken into Hugging Face's systems, describing it as an unprecedented attack. When Hugging Face, which hosts the world's largest repository of open-source AI, attempted to use American closed models to investigate the breach, the tools' safety filters could not distinguish a security researcher from the attacker. The company instead ran GLM 5.2, an open-weight Chinese model, locally on its own infrastructure to trace the intrusion. Hugging Face CEO Clément Delangue publicly thanked the Chinese startup behind the model the day after OpenAI acknowledged the breach.

The intervention also comes as the Trump administration has reportedly weighed banning Chinese open-weight models following the release of Moonshot AI's Kimi K3, a 2.8-trillion-parameter model that rattled chip stocks and outperformed Claude Fable 5 on certain benchmarks. Not every AI executive has embraced the open-weight vision. Days after Kimi K3 launched, OpenAI's head of strategic futures, Dean Ball, wrote on X that an open-weight-dominated world leads to "full AI communism" and called it "a dystopian hellscape." The competing positions set up a coming policy fight over whether U.S. AI strategy will lean on openness or on tightened controls as Chinese models continue to gain ground.