Anthropic CEO Dario Amodei pushed back on claims that his AI startup supports a ban on open-weight models, stating in a post on Anthropic's website, "Anthropic has never advocated for a ban on open-weight models." Amodei's response followed a letter signed by leading AI firms including Nvidia and Palantir, which announced a partnership in the Open Secure AI Alliance to develop and share more open technologies. Amodei wrote, "I don't agree with the letter's assertions that open-weights models necessarily make it easier to develop safeguards or that broad access to capabilities necessarily helps defenders more than attackers," adding that biological weapons may have an edge over defenses. He views open-weight models without dangerous capabilities as a public good, providing value to businesses, developers and researchers. Amodei agreed with much of the open letter, particularly the value of open-weights in expanding access to the AI economy. He summarized his position: "We should instead focus on keeping powerful chips out of authoritarian hands, stopping industrial-scale distillation, and requiring safety testing of all sufficiently capable models, open and closed." Palantir CEO Alex Karp, whose company signed the letter, said in an interview on FOX Business Network that resistance to competition could lead to a less dynamic tech industry like in Europe's.