OpenAI, Google, Meta, Anthropic, Nvidia, and xAI signed a voluntary White House AI safety agreement on September 29, committing to monitor frontier model risks in cybersecurity, biosecurity, and chemical threats. The companies pledged to conduct internal inspections, engage independent external agencies for safety assessments, and establish board-level oversight committees. The agreement remains voluntary with no implementation deadlines or penalties for non-compliance. Participating companies retain full authority to select their own auditing agencies to assess safety controls.