Microsoft, NVIDIA and others publish a letter opposing AI open-weight regulation — Anthropic did not sign

Microsoft, NVIDIA, Meta, OpenAI and 35 companies and groups published a letter urging U.S. policymakers not to rush regulations on open-weight AI models.

The letter argues that open models can boost competition and improve safety, while critics warn the policy debate is tied to security and technology-transfer risks.

Anthropic did not sign the letter, highlighting a split among major AI players over how open-weight models should be governed.