Imposes safety, transparency, and accountability obligations on 'large developers' of frontier AI models — defined as entities that have spent over $5 million in compute on at least one frontier model and over $100 million in aggregate compute costs, with accredited academic institutions exempt for academic research. Core obligations include implementing and publicly publishing a written safety and security protocol before deployment, retaining detailed testing records, conducting annual third-party compliance audits, reporting safety incidents to the Division of Homeland Security and Emergency Services within 72 hours, and prohibiting deployment if a frontier model poses unreasonable risk of critical harm. Establishes whistleblower protections for employees who report risks of critical harm. Enforcement is exclusively through the Attorney General, with civil penalties up to $10 million for first violations and $30 million for subsequent violations of the safety provisions.