Anthropic Appoints Mariano-Florentino Cuéllar as First Chief Global Affairs Officer Amid Regulatory Tensions

Anthropic appointed former California Supreme Court Justice Mariano-Florentino Cuéllar as its first chief global affairs officer on August 4, 2026. Cuéllar, a former Obama administration official and Carnegie Endowment president, steps into the role to manage highly strained relations with the US government. Anthropic is currently challenging a Pentagon supply-chain blacklist in federal court and recently resolved an 18-day Commerce Department export ban on its Fable 5 and Mythos 5 models by agreeing to security commitments. Cuéllar leaves his seat on Anthropic's independent Long-Term Benefit Trust to assume the executive post.

Cuéllar CGAO appointment

• ▪Mariano-Florentino Cuéllar will report directly to Anthropic President Daniela Amodei and operate from the company's San Francisco headquarters.
• ▪Anthropic appointed former California Supreme Court Justice Mariano-Florentino Cuéllar as its first chief global affairs officer on August 4, 2026.
• ▪Mariano-Florentino Cuéllar is tasked with managing Anthropic's relationships with the United States government and international partners during a period of expanding global operations.

US government litigation

• ▪The United States Department of Defense designated Anthropic a supply-chain risk under the Federal Acquisition Supply Chain Security Act on March 3, 2026.
• ▪US District Judge Rita Lin issued a preliminary injunction on March 26, 2026, blocking enforcement of the Pentagon's supply-chain risk designation against Anthropic.
• ▪The Pentagon's supply-chain risk designation followed a standoff where Anthropic CEO Dario Amodei refused to permit Claude models to be used for autonomous lethal weapons or mass domestic surveillance.
• ▪Anthropic filed two federal lawsuits on March 9, 2026, challenging the Pentagon's supply-chain risk designation, which remains active in federal court.

Export control restrictions

• ▪The Commerce Department lifted the export ban on June 30, 2026, after Anthropic agreed to a specific set of security commitments.
• ▪The United States Commerce Department issued an export control directive on June 12, 2026, temporarily banning Anthropic from selling its Mythos 5 and Fable 5 AI models to foreign buyers.
• ▪Anthropic took its Fable 5 and Mythos 5 models entirely offline globally for approximately 18 days following the June 12, 2026, export control directive.

Long-Term Benefit Trust transition

• ▪Mariano-Florentino Cuéllar is stepping down from Anthropic's independent, four-member Long-Term Benefit Trust, where he has served as a trustee since January 2026.
• ▪The Long-Term Benefit Trust is actively seeking a successor to fill the independent seat vacated by Mariano-Florentino Cuéllar.

International regulatory strategy

• ▪Anthropic met with White House officials on August 4, 2026, alongside Google, Meta, and OpenAI, to discuss a voluntary cybersecurity assessment framework for advanced AI models.
• ▪At a June 2026 G7 summit working lunch, French President Emmanuel Macron warned that sudden unilateral US export restrictions on AI could damage foreign economies and AI developers.

Cuéllar policy credentials

• ▪Mariano-Florentino Cuéllar served as president of the Carnegie Endowment for International Peace until July 2026, where he co-chaired a task force on US national security and nuclear proliferation.
• ▪Mariano-Florentino Cuéllar served as a special assistant in the White House under former Democratic President Barack Obama, working on regulatory policy and public safety.
• ▪A 2025 study co-led by Mariano-Florentino Cuéllar informed California's SB 53, an AI safety law signed by Governor Gavin Newsom on September 29, 2025, which Anthropic endorsed.

8 sources