Anthropic Names Cuéllar Chief Global Affairs Officer Amid Trump Tensions

Anthropic, the developer of the Claude AI models, has appointed Mariano-Florentino Cuéllar, a former California Supreme Court justice and Carnegie Endowment for International Peace leader, as its first chief global affairs officer. Cuéllar will report to President Daniela Amodei and manage U.S. government relations amid a Pentagon blacklisting and export ban on Anthropic's Mythos 5 and Fable 5 models. His appointment signals a strategic push to shape global AI governance and navigate tensions with the Trump administration.

August 4, 2026 , Inside AI — Anthropic, the developer of the Claude family of AI models, has appointed Mariano-Florentino Cuéllar as its first chief global affairs officer. The move signals a strategic effort to navigate escalating policy tensions with the Trump administration and shape global AI governance. Cuéllar, a former California Supreme Court justice and special assistant to President Barack Obama, will report to Anthropic President Daniela Amodei . He steps into the role amid a turbulent period for the startup, which has faced a Pentagon blacklisting and a temporary export ban on its top-shelf models, Mythos 5 and Fable 5 , over national security concerns. His appointment combines deep government experience with AI expertise. Since January, Cuéllar served on Anthropic's Long-Term Benefit Trust, an independent body ensuring the company's public benefit mission. He now leaves that role to directly manage relationships with the U.S. government and international partners. Anthropic described Cuéllar as a consensus builder. His background includes leading the Carnegie Endowment for International Peace until July, where he co-chaired a task force on national security and nuclear proliferation. Some AI leaders view nuclear arms controls as a model for managing AI risks. Cuéllar's 2025 study informed California's SB 53 , a whistleblower protection law that mandates incident reporting and includes fines up to $1 million per violation. Anthropic endorsed the bill, underscoring Cuéllar's alignment with the company's policy goals. In a statement, Cuéllar said policymakers recognize an "inflection point" in AI development. "The choices we make today will determine whether humanity can harness extraordinary possibilities to advance science and improve lives across the world or face enormous risk and growing inequality," Mariano-Florentino Cuéllar, chief global affairs officer, Anthropic. Oren Cass , founder of the conservative think tank American Compass , told Reuters that Cuéllar would be "open-minded" to the Trump administration's positions. Cass, who has known Cuéllar for years, said his approach would provoke "good deliberative policymaking." Nuclear Arms Lessons Meet AI Governance Cuéllar's tenure at Carnegie Endowment placed him at the intersection of security and technology. The task force he co-chaired examined how nuclear nonproliferation frameworks could inform AI oversight. This perspective is critical as Anthropic challenges export controls that treat advanced models like strategic weapons. The Carnegie task force report https://carnegieendowment.org/research/2025/03/ai-governance-and-nuclear-nonproliferation argued for international coordination to prevent AI arms races. Cuéllar's hiring suggests Anthropic seeks to embed such thinking into its corporate diplomacy. Export Controls Reshape Corporate Strategy Anthropic's legal battle against the Pentagon blacklisting and the export ban on Mythos 5 and Fable 5 highlights the clash between innovation and national security. The company argues the controls are overly broad, but the administration cites risks of AI-powered hacking. Cuéllar's role will involve negotiating these red lines. A Bureau of Industry and Security document https://www.bis.gov/sites/default/files/2026-06/ai-export-controls-interim-final-rule.pdf details the temporary ban, which restricts sales to foreigners. Anthropic is pushing for a more nuanced framework that balances security with commercial interests. Cuéllar's bipartisan appeal may help. Cass noted that Cuéllar's progressive pragmatism could bridge divides, citing their regular bipartisan discussions. The hire comes as other AI firms also bolster policy teams, but Anthropic's pick stands out for its judicial and diplomatic heft. The Long-Term Benefit Trust will now seek a successor for Cuéllar's seat, maintaining its four-person oversight. Anthropic declined to make Cuéllar available for an interview, but his statement emphasized the stakes of current decisions. As AI governance enters a critical phase, Cuéllar's influence will be tested in courtrooms and capitals alike. His success may define whether Anthropic can turn policy friction into a competitive advantage.