Will the U.S. test a nuclear weapon by December 31 2026?

Prediction markets put the probability at 7%: Will the U.S. test a nuclear weapon by December 31 2026. Currently, markets see this as unlikely (7% YES). The United States has only one type of nonstrategic nuclear weapon in its stockpile: the B61-12 gravity bomb, which has a yield of up to 50 kilotons.

What’s Happening

The question of whether the u.s. test a nuclear weapon by december 31 remains a live geopolitical issue, driven largely by the ongoing modernization of the American nuclear arsenal. According to the Bulletin of the Atomic Scientists, the United States has completed the deployment of the B61-12 gravity bomb, a 50-kiloton yield weapon that has fully replaced the older B61-3 and -4 variants, with approximately 200 of these bombs currently stockpiled for delivery by nonstrategic aircraft. This transition is part of a broader fiscal year 2026 budget that includes substantial research, development, test, and evaluation funds—over $1.8 million and $2.8 million in separate contracts awarded to the Air Force Nuclear Weapons Center at Hill Air Force Base, Utah, and Tinker Air Force Base, Oklahoma, respectively, as reported by the U.S. Department of War on July 3. These contracts explicitly list "test" as a funded activity, though they do not specify whether that involves a full nuclear detonation or merely non-explosive component testing, leaving the probability of an actual test by the end of 2026 low but not negligible. [Thebulletin, Mar 12] [U.S. Department of War, Jul 03]

The diplomatic and strategic environment surrounding any potential decision to test is tense, with adversaries actively expanding their own capabilities. North Korea, for instance, has continued its nuclear development under a five-year defense plan unveiled at the 9th Party Congress, with state media confirming a recent test that supports efforts to secure a credible second-strike capability; leader Kim Jong Un on May 23 condemned U.S. actions as "hegemonic state terrorism," likely referencing U.S.-Israeli strikes on Iran, according to the American Enterprise Institute. Meanwhile, Russia has test-launched its Sarmat intercontinental ballistic missile, with President Vladimir Putin hailing the launch on May 13 and announcing that Moscow is in the "final stages" of developing the nuclear-armed Poseidon underwater drone and the Burevestnik cruise missile, as reported by Al Jazeera. These developments create a security dilemma: hawks within the U.S. defense establishment argue that a test would signal resolve and validate aging stockpile reliability, while analysts caution that such a move would break a de facto moratorium observed since 1992 and could trigger a new arms race with both Moscow and Pyongyang. [AEI, Mar 31] [Aljazeera, May 13]

Domestic political and legal factors will likely determine whether the u.s. test a nuclear weapon by december 31, with the legacy of past tests weighing heavily on public opinion. A recent Deseret News report highlighted ongoing litigation from "downwinders"—Americans exposed to radioactive fallout from tests like the failed Baneberry underground detonation at the Nevada Test Site in 1970—with cancer victims holding the government accountable for decades of health consequences. This history creates a significant political barrier, as any new test would almost certainly face legal challenges and congressional scrutiny, particularly given that the current stockpile is maintained through subcritical experiments and computer simulations rather than full-yield detonations. The structural factor that will resolve this market is the National Nuclear Security Administration's budget cycle: if Congress appropriates funds explicitly for a test in the fiscal 2026 supplemental or the fiscal 2027 budget, the probability rises sharply; otherwise, the 7% likelihood reflects the institutional inertia against breaking a 34-year moratorium. The contracts awarded in July, while including test-related

Traded on Polymarket — $51K Volume

Lower-volume market on Polymarket ($51K). Wider spreads expected — enter with limit orders and be aware of slippage risk. Currently 6c YES.