Anthropic Says It’s Against A Ban On Open Weight Models. That left one major player off the letter: Anthropic (a company that has so far refused to release any open weight models). Earlier this week, Anthropic’s Dario Amodei came out and tried to explain/justify the company’s stance, which boils down to: “we don’t think anyone should ban open weight models… but we do think the US should ban all the conditions that make quality open weight models possible.” While he says the US shouldn’t ban open weight models (and it shouldn’t), he then puts a bunch of conditions on it, which would make it that much more difficult for the current crop of open weight models to compete. Amodei also claims he supports the general argument of the open letter, but he disagrees with the idea that open weight models lead to better security:This brings me to the open letter .