Nvidia, Microsoft and other tech heavyweights made a public case to lawmakers on Friday in favor of open-source ‌AI models, wading into a debate roiling the business and policy worlds over ‌who controls the powerful technology. In a letter posted on X and also signed by two dozen companies and groups ​including Meta Platforms and IBM, Nvidia CEO Jensen Huang said that lawmakers should avoid "premature restrictions on open models that stifle competition or drive innovation overseas." The letter adds to the growing debate about open-source models that are harder to regulate, such as Nvidia's own and those released ‌in recent weeks by Chinese ⁠labs, and the closed-source models controlled by specific companies such as OpenAI and Anthropic.