Anthropic CEO Dario Amodei says he does not support open-weight AI ban

Anthropic CEO Dario Amodei said Monday that he has "never advocated" for a ban on open-weight AI models, rejecting accusations that his lab is seeking to shield its closed-model business from competition.

Why it matters: Anthropic has become the most prominent holdout from a new industry push to defend open-weight AI, after Nvidia, Microsoft, Meta, Google, OpenAI and dozens of other companies signed a letter urging Washington not to restrict the technology.

• The push was triggered by the shock debut of Kimi K3, a Chinese open-weight model that rattled Silicon Valley by approaching U.S. frontier performance at a fraction of the cost.
• The Trump administration has weighed taking action against open-source models, including sanctions against Chinese labs accused of stealing U.S. AI research through "distillation."

Driving the news: "Anthropic has never advocated for a ban on open-weights models," Amodei wrote in a new blog post, calling models without dangerous capabilities "a public good."

• He argued that a ban on Chinese open models would do little to stop the actual threat, since "bad actors are unlikely to be legitimate US businesses."
• He acknowledged a ban would shield U.S. labs like Anthropic from competition — but insisted "that has never been my goal."

Between the lines: Amodei is trying to draw a narrow line between opposing open-weight bans and supporting tougher controls on the most powerful AI systems.

• The Anthropic CEO said he agrees that open models can expand access, competition and customer control.
• But he rejected the letter's claim that open-weight models necessarily make AI safer or give cyber defenders an advantage over attackers.

Zoom in: Instead of a ban, which he said "would not address my most serious national security concerns," Amodei called for three narrower policies:

• Tighter controls on advanced chips and chipmaking equipment flowing to authoritarian governments.
• A crackdown on "industrial-scale distillation," or training models on the outputs of more advanced systems.
• Mandatory safety testing for sufficiently capable models, whether open or closed.

Catch up quick: Anthropic faced criticism after it declined to join Nvidia CEO Jensen Huang's open-weight letter.

• Google and OpenAI, Anthropic's two biggest closed-model rivals, signed on this weekend after originally abstaining. Anthropic still has not.
• Its absence fueled accusations — including from White House AI adviser David Sacks — that the company was using safety concerns to defend its own business model.

The bottom line: Amodei doesn't want Washington to ban open models. He wants Washington to regulate the chokepoints — chips, distillation and safety testing — that determine how powerful those models can become.