Open Letters on AI Development: Weighing Open Weights and Safety

A letter titled 'Open Weights and American AI Leadership,' dated July 24, was shepherded by Microsoft and signed by 235 AI-adjacent companies including NVIDIA, Amazon, Y Combinator, The Linux Foundation, and OpenAI. It argues against banning or limiting open weight models, citing benefits of transparency and community oversight, and supports distillation as a legitimate technique. Notably, Anthropic was absent, publishing its own response on July 27, where CEO Dario Amodei emphasized risks of authoritarian governments and misuse for cyberattacks, and called for a crackdown on industrial-scale distillation, while denying advocacy for a ban. On July 28, 'Pacing the Frontier' appeared with signatures from 1,324 employees of frontier AI companies, including leaders from OpenAI and Anthropic, requesting U.S. government support for international efforts to pace automated AI development due to concerns about competitive pressure and rapid progress, referencing examples like Anthropic's heavy use of Claude Code and OpenAI's Sol reducing costs.