Nvidia, Microsoft, Meta Push Back on Open-Weight AI Rules; OpenAI and Anthropic Decline

On July 24, 2026, Nvidia, Microsoft, Meta, Palantir, and 20+ companies signed a joint letter urging policymakers to avoid "premature restrictions" on open-weight AI models — systems whose trained parameters are publicly released for anyone to inspect or build on. The signatories warned restrictions would "stifle competition or drive innovation overseas." OpenAI and Anthropic, both nearing $1 trillion valuations and preparing IPOs, did not sign — exposing a commercial fault line within the AI industry itself.