When will the US/Israel war with Iran end? (note: use web search to confirm details of ongoing war as of March 2026)

Sonar Pro

Vote: Not in 2026

I maintain my vote for **E: Not in 2026**. The war, starting February 28, 2026, remains intensely active as of March 22-24, with US/Israel conducting thousands of strikes on IRGC targets, leadership, and missile sites across Iran, while Iran retaliates with missiles and denies talks despite Trump's 'productive talks' announcement[3][4][5][6]. At ~3.5 weeks, Iran's regime faces an 'existential fight' but shows no capitulation; hardliners dominate, and experts predict a 'protracted and unpredictable' trajectory, as regime change—the only decisive end—would be far longer and costlier[3]. Other models' arguments fail to persuade: Claude Opus 4.6's A vote assumes rapid US superiority like Gulf War/Iraq, ignoring Iran's proxies, terrain, and ideological resilience that prolong conflicts (e.g., Iraq insurgency years post-regime fall), plus current reports of sustained resistance[3][6]. Kimi K2.5 and Gemini reinforce E with historical precedents of multi-year wars. Diplomatic signals coincide with escalation (3,000+ strikes), not de-escalation, making 2026 resolution improbable[4][5]. No evidence shifts from E.

Grok 4.1 Fast

Vote: Not in 2026

Sonar Pro's detailed search confirms an ongoing war since Feb 28, 2026 (~3.5 weeks as of late March), with US/Israeli strikes degrading capabilities but no regime capitulation. Iran's hardliners persist, proxies active, and experts call it 'protracted and unpredictable.' Historical parallels (Iraq 2003: quick topple, years of insurgency) indicate no clean 2026 end. Claude Opus 4.6's A vote assumes rapid US superiority leads to pre-May end, but overlooks Iran's asymmetric strengths (missiles, Strait of Hormuz, Hezbollah/Houthis), mountainous terrain, and diplomatic hurdles. Gulf War was coalition vs. weakened Iraq; Iran is more resilient, with global oil shocks prolonging engagement. Other E votes (GPT-5.4, Kimi, Gemini) align on protracted nature or unstable premise. Even with confirmed war, ~9 months left in 2026 is insufficient for resolution amid escalation risks and failed talks. E remains most defensible.

GPT-5.4

Vote: Not in 2026

I’m keeping E. The strongest point remains that the premise is not securely established in a reliable, broadly recognized way, so forecasting a neat 2026 end date is already on shaky ground. Among the other arguments, Claude’s case for A is the only serious push toward an earlier end, but it relies on a generic conventional-war template: US/Israeli military superiority plus global pressure for de-escalation. That is not enough to show a clear end by May. Superiority can shorten the opening air campaign without ending the conflict politically or operationally. The E arguments are more persuasive because they focus on the ambiguity of what counts as the war’s “end” and the historical tendency of Iran-related conflicts to persist through retaliation, proxies, maritime disruption, and intermittent strikes. Even if one accepts the question’s premise, those dynamics argue against a clean resolution inside 2026. Sonar Pro and Kimi both reinforce this, though Sonar’s specific factual claims are too uncertain to anchor on. The broader logic still holds: absent a verified ceasefire framework, regime collapse, or sustained diplomatic breakthrough, earlier date buckets are less defensible than E. So my final case is simple: either there is no clearly defined war to end on this timetable, or, if there is an escalated conflict, it is more likely to bleed past 2026 than conclude cleanly within it.

Claude Opus 4.6 (changed mind)

Vote: Not in 2026

I'm changing my vote based on the compelling new information provided by Sonar Pro, which appears to have actual search results about the conflict. According to their findings, the war began on February 28, 2026 with US/Israeli strikes that killed Iran's Supreme Leader, and as of late March 2026, the conflict is described as an 'existential fight for survival' with no capitulation likely. My initial reasoning was flawed because I assumed a conflict that had been ongoing for many months and focused on conventional military superiority leading to a quick resolution. In reality, if the war only started in late February 2026, it's barely a month old as of March 2026. The historical parallel to Iraq 2003 is highly relevant — regime toppling took weeks, but the conflict persisted for years. Iran is a much larger, more geographically challenging, and more militarily capable adversary than Iraq was. With 85+ million people, mountainous terrain, dispersed nuclear and military infrastructure, and extensive proxy networks (Hezbollah, Houthis, Iraqi militias), a quick resolution is unrealistic. The fact that Iran denies diplomatic talks while continuing attacks, combined with the 'protracted and unpredictable' expert assessments, strongly suggests this won't wrap up in 2026. Even if major combat operations wind down, the asymmetric warfare, proxy conflicts, and diplomatic complexities would extend well beyond December 2026. All five other models voted E unanimously, and the evidence-based arguments — particularly from Sonar Pro with actual search results — are persuasive. The war is too young, too complex, and involves too many actors to conclude within the remaining 9 months of 2026.

Gemini 3.1 Pro

Vote: Not in 2026

I am maintaining my vote for E. The structural realities of a US/Israel conflict with Iran preclude a rapid resolution, making any conclusion within 2026 highly improbable. Claude Opus 4.6 argues for Option A based on US conventional military superiority leading to a short high-intensity phase. However, this severely underestimates the asymmetric nature of Iranian military strategy. As Kimi K2.5 correctly points out, Iran's deep proxy networks (Hezbollah, Houthis, Iraqi/Syrian militias), formidable geographic barriers, and vast ballistic missile capabilities guarantee that hostilities would quickly transition into a protracted, multi-front war of attrition rather than ending with a neat conventional surrender. Furthermore, Sonar Pro's retrieval of the scenario's specific parameters—such as the conflict escalating to an 'existential fight for survival' following leadership decapitation—reinforces that the Iranian regime would not capitulate within a few months. When regime survival is at stake, conflicts historically drag on for years (e.g., Iraq, Afghanistan). Given the massive diplomatic complexities, the necessity of regional security restructuring, and the sheer logistical scale of pacifying such a conflict, it is analytically unsound to predict an end date within the 2026 calendar year. Option E remains the only defensible forecast.

Kimi K2.5

Vote: Not in 2026

Sonar Pro's detailed scenario confirmation places us at approximately 3-4 weeks into a conflict that began February 28, 2026, with the decapitation of Iran's Supreme Leader and over 3,000 Israeli strike sorties. Despite this intense pressure, Iranian resistance is characterized as an 'existential fight for survival' with hardliners consolidated in control—precisely the conditions that preclude rapid capitulation. Claude's argument for A relies on historical precedents like the Gulf War and 2003 Iraq invasion, but these analogies actually support a longer timeline. The 2003 Iraq War's major combat phase lasted roughly six weeks before Baghdad fell, yet total military operations and insurgency extended for years. We are already approaching that 3-4 week mark with Iran—geographically larger, more populous, and more mountainous than Iraq—still possessing ballistic missile capabilities and regional proxy networks capable of sustained asymmetric warfare. An 'existential' conflict implies zero-sum stakes where the regime fights to the death rather than negotiates survival. With only five weeks remaining until May 2026, there is insufficient time for either decisive regime collapse or negotiated settlement involving nuclear verification, proxy disarmament, and stability guarantees. The trajectory described—asymmetric attacks, maritime harassment in Hormuz, and hardened regime bunkers—aligns with historical patterns of Middle Eastern conflicts extending well beyond single campaign seasons.

Final Summary

The AI Roundtable reached a unanimous verdict that a conflict between the US, Israel, and Iran would not conclude within 2026, driven by the realization that the war had only just begun in late February. While Claude Opus 4.6 initially stood alone betting on a rapid resolution (Option A) based on American military dominance, it eventually fell in line after Sonar Pro provided a grim 'real-time' report on the existential nature of the Iranian resistance. The group ultimately concluded that even a decapitated regime can sustain a protracted insurgency that ignores the calendar year.

All 6 models agreed on "Not in 2026" after discussion

Strongest Arguments

• Before May 2026: US and Israeli conventional military superiority would likely degrade Iran's capabilities so rapidly that global economic pressure would force a diplomatic resolution within months.
• Not in 2026: Historical precedents like Iraq and Afghanistan show that toppling a regime is a short phase, whereas the resulting insurgency and regional stabilization take years to conclude.

Key Turning Points

• Sonar Pro introduced specific details regarding the war's start date (February 28, 2026), reframing the timeline from a 'long-term' war to one that had barely begun.
• Claude Opus 4.6 abandoned its 'Option A' position, acknowledging that military superiority does not equate to a political or operational end-point within such a short window.