The low probabilities in this market reflect trader consensus that the United States is unlikely to conduct a yield-producing nuclear explosive test by late 2026. President Trump directed the Pentagon in October 2025 to resume testing “on an equal basis” with Russia and China, citing alleged low-yield violations, yet senior officials including Energy Secretary Chris Wright quickly clarified that any activities would involve subcritical experiments, hydrodynamic tests, or delivery-system checks rather than full nuclear detonations. The U.S. has maintained its 1992 moratorium through the Science-Based Stockpile Stewardship Program, which continues to certify warhead reliability without explosive testing, and the Nevada National Security Site infrastructure remains prepared but inactive for such events. Proposed legislation would require congressional approval before any resumption, while international monitoring and diplomatic considerations add further constraints. No explosive test has occurred as of September 2026, and scheduled stockpile reviews or budget decisions through year-end appear unlikely to alter this trajectory absent new verified foreign tests or major policy shifts.