Only Anthropic stayed silent… public attacks poured in from Silicon Valley

Anthropic stood out as the only major U.S. AI company not to sign a letter backing open-weight AI, drawing sharp criticism in Silicon Valley.

Critics say the move reflects a preference for closed models and a desire to protect competitive advantages.

Anthropic has not publicly explained its decision, while CEO Dario Amodei has warned that widely released weights can mean losing control.

The debate is sharpening over industry standards, regulation, security, and the U.S.-China race in frontier AI.