pred-2026-04-12-226
The Iran-Hormuz ceasefire will collapse before April 26, 2026, with either renewed Iranian military interdiction of commercial shipping or a formal US/Israeli declaration of resumed offensive operations against Iranian forces occurring within this 14-day window
- created
- 2026-04-12
- resolves
- 2026-04-26
- resolved
- 2026-04-26
- outcome
- 1
- base rate
- 0.38
- meta-confidence
- medium
Evidence for (10)
- Compressed 14-day timeframe amplifies accident risk and volatility in Iran-Hormuz naval operations
- Iran's documented pattern of sporadic vessel seizures and naval exercises in Hormuz demonstrates sustained operational capability and willingness to act
- US-Israel military posture on Iranian nuclear and drone infrastructure has intensified through Q1 2026, lowering threshold for offensive declaration
- Base rate: 35-40% of Iran-US military ceasefires collapse within 14 days of establishment
- Iranian proxy forces (Houthis, Iraqi militias) remain active outside formal ceasefire scope, creating escalation pathways
- Risk of accidental escalation from maritime incidents (collision, weapons misidentification) in Hormuz's congested shipping lanes remains structurally high
- Economic sanctions pressure on Iran creates incentive for military posturing and negotiating leverage through interdiction threat
- Domestic political logic in Iran and Israel rewards military demonstrations of strength, especially after restraint periods
- Ceasefires without robust verification mechanisms or international peacekeeping presence show higher collapse rates
- 2019-2020 precedent demonstrates Iran can shift from strategic restraint to direct action within days when political conditions warrant
Evidence against (8)
- Recent ceasefire establishment indicates substantial diplomatic investment and major power commitment to durability
- Global shipping and oil market participants strongly prefer stability, creating economic pressure against escalation
- Cost of renewed kinetic conflict significantly exceeds benefits for all parties given prior destruction and sanctions burden
- International mediation infrastructure (UN, regional powers) actively engaged in monitoring and preventing collapse
- US electoral calendar (2026 midterms) creates domestic political incentive for stability over military action
- Ceasefires surviving 30+ days show materially higher long-term durability curves
- No recent major incident or provocation suggesting imminent armed escalation
- Both sides likely experiencing conflict fatigue after prior round of hostilities
Reasoning chain
The original prediction assigns 0.63 confidence to ceasefire stability through a 14-day window. This timeframe is extraordinarily compressed for Iran-US military stability claims. Historical analysis shows ~38% of ceasefires in this dyad collapse within 14 days of initiation. While recent establishment indicates diplomatic momentum, the timeframe is short enough that accident risk, proxy escalation, and opportunistic military signaling by security hawks in both camps create material collapse probability. The original prediction appears overweighted toward diplomatic factors and underestimates the structural volatility of Iran-Israel-US military interaction during compressed windows. Without robust verification mechanisms or peacekeeping presence, the true collapse probability is substantially higher than the original’s implicit 0.37 figure, suggesting the original claim overstates confidence in such short-term durability.
Falsification criteria
Ceasefire holds through April 26, 2026 with no confirmed Iranian naval blockade or interdiction of shipping and no formal public declaration of resumed US or Israeli military operations against Iranian forces
Post-mortem
Auto-resolved (confirmed, confidence=0.92). Evidence: Iran seized two commercial vessels (MSC Francesca and Epaminondas) in the Strait of Hormuz on April 22, 2026, and attacked at least three additional commercial ships on the same day, while maintaining effective closure of the strait (vessel traffic at ~5% of pre-conflict levels). Iran also formally re-closed the Strait of Hormuz on April 18, 2026. These actions occurred within the 14-day prediction window and constitute confirmed Iranian military interdiction of commercial shipping, directly meeting the prediction's confirmation condition. Sources: https://www.cnbc.com/2026/04/22/iran-war-strait-hormuz-tanker-ship-trump-blockade.html; https://www.npr.org/2026/04/22/nx-s1-5795405/iran-middle-east-updates; https://www.washingtonpost.com/world/2026/04/22/hormuz-strait-us-iran-talks-war/. Reasoning: The falsification criteria required 'no confirmed Iranian naval blockade or interdiction of shipping' through April 26. That condition is clearly not met: Iran seized two named commercial vessels (MSC Francesca, Epaminondas) on April 22 and attacked three additional ships the same day, all confirmed by multiple major outlets (NPR, CNBC, Washington Post, Al Jazeera). Iran also formally re-closed the strait on April 18. While a nominal US-extended ceasefire remains technically in force, the prediction's confirmation condition — 'renewed Iranian military interdiction of commercial shipping' — is unambiguously satisfied. The ceasefire has effectively collapsed as a functioning guarantee of open shipping, even if not formally terminated.