Dario Amodei was a big supporter of the US AI diffusion rule.

True: Amodei's or Anthropic's public record before 2025-03-10 shows clear, strong support for the Biden administration's AI diffusion rule (the Framework for AI Diffusion, January 2025), for example public endorsements, essays, op-eds or formal comments backing it. Mostly true: clear support is documented, but with notable reservations or suggested changes that make 'big supporter' slightly overstated. Mixed: his statements are about equally supportive and critical. Mostly false: only lukewarm or incidental support, or support only for export controls in general rather than the rule. False: the record shows he opposed or did not support the rule.

Set before the research began.

1. E1 Anthropic's Dario Amodei on AI Competition ChinaTalk (interview with Jordan Schneider) · 5 February 2025

   “Before we get to the end of this, it’s something that needs to be stopped or at least stopped at scale.”

2. E2 Anthropic's Dario Amodei on AI Competition ChinaTalk (interview with Jordan Schneider) · 5 February 2025

   “It’s of less immediate concern to me because it’s farther up in the supply chain.”

3. E3 Recommendations to OSTP for the US AI Action Plan Anthropic · 6 March 2025 Own record

   “Strengthening Export Controls: We advocate for tightening semiconductor export restrictions so as to ensure America and its allies can capitalize on the opportunities of powerful AI systems, and to prevent our adversaries from accessing the AI infrastructure that enables powerful AI.”

4. E4 Anthropic's position on the diffusion rule Anthropic · 30 April 2025 Own record

   “Anthropic’s submission recommends strengthening the rule in three key areas:”

5. E5 Anthropic's Dario Amodei on AI Competition ChinaTalk · 5 February 2025

   “The diffusion rule prevents or limits that within tier two countries outside the U.S. Some of it is done in the U.S. as well. It’s of less immediate concern to me because it’s farther up in the supply chain.”

6. E6 Anthropic's Dario Amodei on AI Competition ChinaTalk · 5 February 2025

   “I’m less immediately concerned about it. Before we get to the end of this, it’s something that needs to be stopped or at least stopped at scale.”

7. E7 Anthropic's Dario Amodei on AI Competition ChinaTalk · 5 February 2025

   “Near the end they put in place the diffusion rule, which prevents that when it’s Chinese cutout companies.”

8. E8 Anthropic suggests tweaks to proposed US AI chip export controls | TechCrunch TechCrunch · 30 April 2025

   “Anthropic’s CEO Dario Amodei has been one of the more vocal U.S. AI leaders in favor of export restrictions. Amodei wrote an op-ed in the Wall Street Journal in January about why the U.S. needs stronger chip export controls.”

9. E9 US Tech CEOs Admit They Want AI Monopoly & ‘Unipolar World’, Blocking China’s Competition ScheerPost (Geopolitical Economy Report, Ben Norton) · 4 February 2025

   “In a follow-up article published a few weeks later at his personal website, Amodei argued that the rapid progress being made by Chinese AI companies like DeepSeek makes “export control policies even more existentially important”.”

10. E10 Anthropic Backs US AI Chip Export Controls with Key Recommendations for Stronger Enforcement Maginative · 30 April 2025

    “Anthropic "strongly supports" the US AI Diffusion Framework while proposing three specific refinements to strengthen its effectiveness”

11. E11 Anthropic Safety Mission Meets a $380 Billion Valuation Philipp Dubach (personal blog) · 9 May 2026

    “In January 2025, Amodei and former deputy national security advisor Matt Pottinger co-authored a Wall Street Journal opinion piece. Trump Can Keep America’s AI Advantage argued for tighter chip-export controls against China.”

The criteria require Amodei's or Anthropic's public record from before 2025-03-10 to show clear support for the diffusion rule. The evidence from that period does not settle this. In the February 2025 ChinaTalk interview, Amodei describes the rule as something that "prevents that when it's Chinese cutout companies" (E7). Nearby remarks about "less immediate concern" seem to be about a separate supply-chain issue (E5, E6). The other pre-deadline items show support for export controls in general, not for this specific rule (E3, E8, E9, E11). Anthropic's explicit statement that it "strongly supports" the rule and wants it strengthened comes from April 2025, after the claim date (E4, E10). That points toward support but cannot show what the record contained before 2025-03-10, so the evidence is not enough for a verdict.