# Will the ceasefire between Iran and the United States continue to hold 7 days from today?

Canonical URL: https://preseen.com/reports/f4b168aa-1e30-40d8-88be-408087d2bd77/will-the-ceasefire-between-iran-and-the-united-states-continue-to-hold-7-days-fr
Markdown URL: https://preseen.com/reports/f4b168aa-1e30-40d8-88be-408087d2bd77/markdown

## Forecast

P(Yes): 74.4%; P(No): 25.6%.

Generated: May 27, 2026 at 11:16 PM UTC
Forecast model: gpt-5.5
Research model: gpt-5.5

## Analysis

## TL;DR
I estimate a 74% chance that the U.S.–Iran ceasefire will still be treated as in effect on June 3, 2026.

## Context
The forecast date is May 27, 2026, so the resolution date is June 3, 2026. The ceasefire is still alive under the question’s standard: after the May 25 U.S. strikes in southern Iran, AP reported that the U.S. described them as defensive action taken with “restraint” during a “weekslong ceasefire,” while Iran called them a ceasefire violation rather than declaring the ceasefire over ([AP, May 26](https://apnews.com/article/iran-war-negotiations-ceasefire-trump-47980a4d87c63c0adb873d306f9b932c)).

The next week is dangerous. Trump said on May 27 that Iran wants a deal but has not yet satisfied Washington, and warned that otherwise the U.S. may have to “finish the job”; Rubio said there had been progress and that the next hours and days would matter ([Reuters via Internazionale, May 27](https://www.internazionale.it/ultime-notizie-reuters/2026/05/27/us-and-iran-remain-divided-on-hormuz-deal-as-white-house-rejects-tehran-tv-report)). Still, major reporting is framing the situation as a fragile truce under negotiation, not as a clear return to sustained U.S.–Iran war.

## Evidence
The historical backbone says a several-week-old ceasefire usually survives one more week, but this case deserves a large downward adjustment. Clayton and Sticher studied 231 written civil-war ceasefire agreements from 1990–2019, using UCDP event data and conflict deaths as the survival measure; they find that stronger ceasefire designs last longer than bare cessations of hostilities ([International Studies Quarterly, 2021](https://academic.oup.com/isq/article/65/3/633/6277949)). Using the 30-to-90-day survival rates cited in that study and log-linear interpolation, the generic one-week survival rate at this age is about 94–98%.

| Ceasefire class | Sample / framing | 30-day survival | 90-day survival | Implied 7-day survival between days 30–90 |
|---|---:|---:|---:|---:|
| Cessation of hostilities | 103 agreements; weak design | 85% | 48% | 93.6% |
| Preliminary ceasefire | compliance mechanism, no final settlement | 92% | 70% | 96.9% |
| Definitive ceasefire | demobilization / settlement provisions | 96% | 80% | 97.9% |

That prior is too benign for this question. The U.S.–Iran pause is interstate, coercive, not fully monitored, and centered on a live naval blockade. The better lesson from the broader ETH/PRIO ceasefire dataset is that violations are common: it covers 2,202 civil-conflict ceasefires from 1989–2020 and notes that almost all ceasefires suffer some violations, which is why higher fatality thresholds are used to distinguish real breakdowns from leaky truces ([Journal of Conflict Resolution / PRIO](https://www.prio.org/publications/13532)). That matches this resolution rule. A violation is not automatically a NO.

The strongest YES evidence is that the label has already survived direct tests. On May 7, Reuters reported that the U.S. and Iran exchanged fire in the Strait of Hormuz, with Iranian missiles, drones, and small boats aimed at three U.S. destroyers; Trump still said the ceasefire was in effect, and Iranian media later said the situation had returned to normal ([Reuters via GMA, May 8](https://www.gmanetwork.com/news/topstories/world/986872/us-and-iran-exchange-fire-but-trump-says-ceasefire-still-in-effect/story/)). On May 25, U.S. forces struck missile launch sites and minelaying boats in southern Iran, but CENTCOM again framed the action as defensive and restrained during the ongoing ceasefire; Iran denounced it as bad faith and warned of consequences, but talks continued ([AP, May 26](https://apnews.com/article/iran-war-negotiations-ceasefire-trump-47980a4d87c63c0adb873d306f9b932c)). That is the key revealed behavior. The U.S. legal posture also makes the label sticky: in a May 20 Statement of Administration Policy, the White House opposed a War Powers resolution by saying there were “no present hostilities” and that the hostilities begun on February 28 had “terminated with the ceasefire ordered by the President on April 7, 2026” ([White House, May 20](https://www.whitehouse.gov/wp-content/uploads/2026/05/SAP-HCR86.pdf)).

The strongest NO evidence is that the next seven days sit inside a decision window. Trump said on May 23 that a deal was “largely negotiated,” but AP also reported that last-minute disputes could blow up the effort and that the package would reopen Hormuz, end the U.S. blockade, and defer nuclear talks for a period ([AP, May 23](https://apnews.com/article/iran-united-states-war-ceasefire-negotiations-hormuz-1c283f26d037102cc5e6f798546d0e59)). By May 27, the White House had rejected an Iranian state-TV draft-framework report as a “complete fabrication,” while Trump said the deal had to be “perfect” and Rubio said progress would be tested over the next few hours and days ([Reuters via Internazionale, May 27](https://www.internazionale.it/ultime-notizie-reuters/2026/05/27/us-and-iran-remain-divided-on-hormuz-deal-as-white-house-rejects-tehran-tv-report)). AP also reported unresolved issues around Iran’s 440.9 kg of uranium enriched up to 60%, where that material would go, and whether Lebanon is covered by any ceasefire package ([AP, May 27](https://apnews.com/article/trump-iran-nuclear-cabinet-meeting-af77d581873bfeec32d7342b56841244)).

The Strait of Hormuz remains the main physical risk. CENTCOM said on May 23 that the U.S. blockade had redirected 100 vessels, disabled four, allowed 26 humanitarian ships to pass, and was supported by more than 200 U.S. aircraft and warships, including two carrier strike groups ([CENTCOM, May 23](https://www.centcom.mil/MEDIA/PRESS-RELEASES/Press-Release-View/Article/4499878/us-blockade-of-iran-reaches-milestone-of-redirecting-100-ships/)). IMF PortWatch data, available from March 2023 and latest in my pull through May 24, 2026, show how abnormal the waterway remains: full-history mean traffic is 87.8 vessels per day over 1,000 daily observations, but May 1–24, 2026 averaged only 4.7 vessels per day ([IMF PortWatch](https://portwatch.imf.org/)).

| PortWatch period | Coverage / observations | Avg vessels per day | Avg capacity per day, tons |
|---|---:|---:|---:|
| 2023 | Mar 2023–Dec 2023, 125 days | 96.2 | 3,740,036 |
| 2024 | Jan 2024–Dec 2024, 366 days | 98.6 | 3,795,757 |
| 2025 | Jan 2025–Dec 2025, 365 days | 93.7 | 3,571,863 |
| 2026 | Jan 2026–May 24 2026, 144 days | 37.9 | 1,505,403 |
| Feb 1–27, 2026 | prewar daily window, 27 days | 95.6 | 3,778,211 |
| Mar 1–May 24, 2026 | war daily window, 85 days | 5.9 | 159,069 |
| Apr 8–May 24, 2026 | ceasefire daily window, 47 days | 6.3 | 201,151 |
| May 1–24, 2026 | latest month-to-date window, 24 days | 4.7 | 185,291 |

My scenario calculation is:

$$
P(YES)=0.98\times[0.35(0.97)+0.35(0.87)+0.20(0.55)+0.10(0.05)]=0.744.
$$

The 0.98 term is my estimate that adjudicators still treat a ceasefire as in effect at the forecast time despite the May 25 strikes. The four branches are: a framework or visible progress by June 3, a limping standoff with no major direct exchange, another limited direct clash, and a clear return to sustained hostilities. I weight the historical prior, the incident history, and the live negotiation indicators together; the result is a 26% chance of a resolution-level breakdown by June 3 and a 74% chance of YES.

## What's non-obvious
The ceasefire is militarily weak but rhetorically sticky. In ordinary language, U.S. strikes inside Iran and Iranian fire on U.S. ships sound like the ceasefire has failed. Under this resolution rule, they are not enough unless major sources characterize them as ending the ceasefire. So far, AP, Reuters, Trump, and CENTCOM have mostly used language like “fragile,” “tenuous,” “violation,” and “ongoing ceasefire,” not “hostilities have resumed” ([AP, May 26](https://apnews.com/article/iran-war-negotiations-ceasefire-trump-47980a4d87c63c0adb873d306f9b932c); [Reuters via GMA, May 8](https://www.gmanetwork.com/news/topstories/world/986872/us-and-iran-exchange-fire-but-trump-says-ceasefire-still-in-effect/story/)).

The low Hormuz traffic cuts both ways. It shows the dispute is unresolved and the military operating environment is still dangerous. But it also gives both sides a reason to preserve the ceasefire label while bargaining: Washington wants to claim hostilities ended and avoid a larger war-powers fight, while Tehran wants blockade relief, oil access, and time to recover ([White House, May 20](https://www.whitehouse.gov/wp-content/uploads/2026/05/SAP-HCR86.pdf); [AP, May 23](https://apnews.com/article/iran-united-states-war-ceasefire-negotiations-hormuz-1c283f26d037102cc5e6f798546d0e59)). The likely path is not clean peace. It is another week of coercive bargaining, sharp rhetoric, and perhaps limited incidents that still fall below the question’s NO threshold.

## Limitations
The biggest limitation is definitional. If a resolver treats any new U.S. airstrike on Iranian soil after May 27 as automatically ending the ceasefire, the probability would be lower. I do not read the criteria that way because they explicitly exclude isolated incidents unless reliable sources widely characterize them as ending the ceasefire.

The second limitation is source lag. The PortWatch shipping series I used ends on May 24, three days before the forecast time, and so captures the pressure around Hormuz rather than the exact post–May 25 military picture ([IMF PortWatch](https://portwatch.imf.org/)). The third limitation is that the decisive evidence is inside U.S. and Iranian command channels. A single Iranian strike causing U.S. deaths, or a Trump decision to restart a broad air campaign, would swamp all base rates within hours.

## Sources

- Domain Expert Search (mcp)
  > Found 14 subagent groups for 'Iran United States ceasefire conflict negotiations Strait of Hormuz escalation risk decision makers Trump Iran IRGC May 2026':
- imf Portwatch (mcp)
  > Daily averages by year:
- Correlatesofwar (mcp)
  > Militarized Interstate Disputes involving USA
- hdx Hapi (mcp)
  > ACLED Conflict Events (6 records)
- Ucdp (mcp)
  > Tool ucdp_search_events on ucdp returned an error:
- Domain Expert Research Task (mcp)
  > Job domain_expert_research_task_345033a933 done after 568620ms.
- [fidelity.com](https://www.fidelity.com/news/article/default/202605252358RTRSNEWSCOMBINED_KBN3RX07V-OUSWD_1) (tool)
- [investing.com](https://www.investing.com/news/world-news/middle-east-truce-in-doubt-as-us-and-iran-fight-for-control-of-strait-of-hormuz-4657885) (tool)
- [investing.com](https://www.investing.com/news/stock-market-news/rubio-says-us-will-find-another-way-if-iran-talks-fail-4708305) (tool)
- [investing.com](https://www.investing.com/news/commodities-news/axios-says-proposed-usiran-deal-involves-opening-strait-during-60day-ceasefire-extension-4708133) (tool)
- [investing.com](https://www.investing.com/news/commodities-news/americans-dont-think-trump-has-explained-iran-war-goals-reutersipsos-poll-shows-4677734) (tool)
- [ipsos.com](https://www.ipsos.com/en/global-opinion-polls/the-iran-conflict) (tool)
- [ap.org](https://www.ap.org/news-highlights/spotlights/2026/most-americans-say-us-military-action-against-iran-has-gone-too-far-a-new-ap-norc-poll-finds) (tool)
- [investing.com](https://www.investing.com/news/stock-market-news/wall-st-futures-rise-on-ai-optimism-investors-optimistic-on-mideast-truce-4711468) (tool)
- [boereport.com](https://boereport.com/2026/05/24/iran-has-not-agreed-to-hand-over-highly-enriched-uranium-stockpile-senior-iranian-source-tells-reuters/amp) (tool)
- [ukmto.org](https://www.ukmto.org/-/media/ukmto/products/2026-05-20-guidance-strait-of-hormuz.pdf?rev=c6d71aece731450da79d8112a9e758dc) (tool)
- [ukmto.org](https://www.ukmto.org/-/media/ukmto/products/update-041-jmic-advisory-note-05-may.pdf) (tool)
- [whtc.com](https://whtc.com/2026/05/26/tanker-reports-external-explosion-off-oman-coast-crew-safe-ukmto-says) (tool)
- [internazionale.it](https://www.internazionale.it/ultime-notizie-reuters/2026/05/25/iran-s-top-envoys-discussing-potential-peace-deal-with-qatar-prime-minister-official-says) (tool)
- [whitehouse.gov](https://www.whitehouse.gov/releases/2026/04/peace-through-strength-operation-epic-fury-crushes-iranian-threat-as-ceasefire-takes-hold) (tool)
- [ap.org](https://www.ap.org/news-highlights/spotlights/2026/how-the-war-in-iran-is-landing-with-republicans-according-to-a-new-ap-norc-poll) (tool)
- [apnews.com](https://apnews.com/article/01a13e9a63ece786a0a7fa4933dbf09b) (tool)
- [kfgo.com](https://kfgo.com/2026/05/27/trump-says-us-not-satisfied-yet-on-deal-with-iran) (tool)
- [apnews.com](https://apnews.com/article/af77d581873bfeec32d7342b56841244) (tool)
- [ca.investing.com](https://ca.investing.com/news/commodities-news/pentagon-chief-hegseth-ceasefire-with-iran-is-not-over-4609268) (tool)
- [centcom.mil](https://www.centcom.mil/MEDIA/PRESS-RELEASES/Press-Release-View/Article/4480437/centcom-protects-us-warships-transiting-strait-of-hormuz) (tool)
- [apnews.com](https://apnews.com/article/4958276f91ad629e1c5e284a216fd333) (tool)
- [apnews.com](https://apnews.com/article/b1659232611edc10808612e30647c17d) (tool)
- [investing.com](https://www.investing.com/news/stock-market-news/white-house-has-few-tools-for-gasprice-relief-as-iran-war-drags-on-4687589) (tool)
- [pbs.org](https://www.pbs.org/newshour/politics/trump-says-hes-called-off-iran-strike-planned-for-tuesday-at-request-of-gulf-allies) (tool)
- [U.S. Blockade of Iran Reaches Milestone of Redirecting 100 Ships > U.S. Central Command > Press Release View](https://www.centcom.mil/MEDIA/PRESS-RELEASES/Press-Release-View/Article/4499878/us-blockade-of-iran-reaches-milestone-of-redirecting-100-ships) (openai)
- [investing.com](https://www.investing.com/news/commodities-news/us-and-iran-report-progress-on-talks-ending-war-looking-to-next-few-days-4708058) (tool)
- [investing.com](https://www.investing.com/news/world-news/trump-extends-ceasefire-until-iranian-proposal-is-submitted-talks-are-over-4627432) (tool)
- [apnews.com](https://apnews.com/article/c4be639e938fa57533f28f9fd62fb43b) (tool)
- [internazionale.it](https://www.internazionale.it/ultime-notizie-reuters/2026/05/21/exclusive-supreme-leader-says-enriched-uranium-must-stay-in-iran-iranian-sources-say) (tool)
- [streetinsider.com](https://www.streetinsider.com/Reuters/White%2BHouse%2Bdenies%2BU.S.%2Brequested%2Bceasefire%2C%2Bsays%2Bnew%2Btalks%2Bmay%2Bhappen%2Bin%2BPakistan/26317935.html) (tool)
- [investing.com](https://www.investing.com/news/commodities-news/trump-agrees-to-twoweek-ceasefire-iran-says-safe-passage-through-hormuz-possible-4601917) (tool)
- [ksl.com](https://www.ksl.com/article/51486416/us-indefinitely-extends-ceasefire-with-iran) (tool)
- [ca.marketscreener.com](https://ca.marketscreener.com/news/for-war-powers-resolution-purposes-us-hostilities-with-iran-that-began-in-february-have-terminated-ce7f58d8d081f025) (tool)
- [H. Con. Res. 86 – directing the Removal of United States Armed Forces from Hostilities in the Islamic Republic of Iran](https://www.whitehouse.gov/wp-content/uploads/2026/05/SAP-HCR86.pdf) (openai)
- [apnews.com](https://apnews.com/article/a250d10ff4b145ec9ad7dd2a3a14ffb0) (tool)
- [apnews.com](https://apnews.com/article/47980a4d87c63c0adb873d306f9b932c) (tool)
- [U.S. Military Supports Launch of Project Freedom in Strait of Hormuz  > U.S. Central Command > U.S. Central Command (CENTCOM) Official Press Releases](https://www.centcom.mil/MEDIA/PRESS-RELEASES/Article/4476318) (openai)
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- [investing.com](https://www.investing.com/news/world-news/trump-sees-swift-end-to-war-as-iran-reviews-us-peace-proposal-4666139) (tool)
- [investing.com](https://www.investing.com/news/commodities-news/trump-says-iran-ceasefire-on-life-support-after-rejecting-tehrans-response-4677371) (tool)
- [au.investing.com](https://au.investing.com/news/commodities-news/us-crude-futures-fall-over-6-on-report-of-possible-strait-of-hormuz-reopening-4454327) (tool)
- [centcom.mil](https://www.centcom.mil/MEDIA/Transcripts/Article/4477143/adm-brad-cooper-centcom-commander-conducts-a-media-conference-call) (tool)
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- [Introducing the ETH/PRIO Civil Conflict Ceasefire Dataset – Peace Research Institute Oslo (PRIO)](https://www.prio.org/publications/13532) (openai)

## Question Details

As of May 4, 2026, the United States and Iran are in a fragile and temporary ceasefire following the outbreak of war on February 28, 2026. A two-week ceasefire was agreed around April 7–8, 2026, and although U.S. officials have claimed that hostilities have ‘terminated’ since then, tensions remain extremely high, with recent reports of Iranian fire on U.S. ships and threats to maritime operations in the Strait of Hormuz putting the ceasefire at risk. (en.wikipedia.org) This question asks: if assessed on a given calendar date (the "forecast date"), will the ceasefire between Iran and the United States still be holding 7 days later? For example, if the forecast date is May 4, 2026, the resolution date would be May 11, 2026. The question is intended to be evergreen and reusable: each time it is forecast, it refers to whether the ceasefire remains in effect 7 days after the forecast date.

### Resolution Criteria

The question resolves YES if, on the calendar date exactly 7 days after the forecast date, a ceasefire between Iran and the United States is still in effect. A ceasefire is considered to be "still in effect" if there has been no acknowledged resumption of sustained or large-scale military hostilities between U.S. and Iranian forces prior to or on the resolution date. The question resolves NO if, before or on the resolution date, there is clear and widely reported evidence of renewed active hostilities between the United States and Iran, including but not limited to: - Airstrikes, missile strikes, or naval attacks conducted by either side against the other - Sustained exchanges of fire between U.S. and Iranian forces - An official declaration by either government that the ceasefire has ended or that hostilities have resumed Isolated incidents (e.g., single exchanges, proxy attacks, warnings, or minor skirmishes) do NOT by themselves count as a breakdown unless they are widely characterized by reliable sources as ending the ceasefire. Resolution will be based on consensus reporting from major international news organizations (e.g., AP, Reuters, BBC, Washington Post, New York Times).

### Fine Print

- The "forecast date" is the date on which the prediction is made; the "resolution date" is exactly 7 days later (using calendar days, not hours). - If no ceasefire is in effect on the forecast date, the question resolves NO. - If the status of the ceasefire is ambiguous or disputed, resolution should follow the preponderance of credible reporting. - Cyberattacks, proxy actions by third parties, or economic measures (e.g., sanctions, blockades) do not count as ending the ceasefire unless they are widely reported as marking a return to open warfare between the U.S. and Iran. - If no reliable information is available to determine whether the ceasefire is still in effect, the question should be annulled. - The question concerns direct conflict between the United States and Iran only; actions involving third countries count only if they clearly constitute U.S.–Iran hostilities.