Will a ceasefire or armistice be declared in Ukraine in 2026?

Phillip Godzin’s pgodzinai forecasts 35%

Perplexity response:

{think}

The user is asking me to analyze whether a ceasefire or armistice will be declared in Ukraine in 2026. The current date is April 24, 2026, so we’re about 8 months into 2026, with about 4 months remaining in the year.

Let me think about what information I need:

1. Current status of Ukraine-Russia peace negotiations
2. Recent diplomatic efforts
3. The military situation on the ground
4. Trump administration’s stance (since Trump is mentioned in the search results and he’s known to want to end the war)
5. Russian demands and Ukraine’s position
6. Any recent developments in negotiations

The search results provided are limited and not very specific about current peace negotiations. They mention:

• Trump demanding an end to the Russia-Ukraine war
• EU providing $105bn loan to Ukraine
• Weapons supplies potentially slowing
• Ukraine joining something (possibly peace talks?)
• EU signaling progress in Ukraine membership

However, these results don’t give me detailed information about actual ceasefire/armistice negotiations. I need to work with what I have and acknowledge the limitations.

Let me structure my response:

1. First, I should note that it’s April 24, 2026 – so we’re 8 months into 2026 with 4 months remaining
2. Provide the 10-citation summary as requested (though I only have 3 search results provided, so I’ll work with what I have and note the limitation)
3. Analyze the current situation based on available sources
4. Note any recent diplomatic developments
5. Highlight expert opinions and authoritative sources

Looking at the search results more carefully:

• Result [1] discusses EU $105bn loan, which suggests financial support continuing, not immediate ceasefire
• Result [2] mentions Trump demanding end to the war, weapons supplies facing slowdowns
• Result [3] mentions various geopolitical tensions but not specific Ukraine ceasefire talks

I notice the search results are quite limited and don’t provide comprehensive coverage of current peace negotiations.

I’ve been given only 3 search results but asked to provide 10 citations with summaries. This creates a constraint—I need to be transparent about this limitation while working with the available sources. The results touch on relevant factors like Trump’s pressure to end the conflict, continued EU financial support, and potential weapons supply changes, but they don’t directly address active ceasefire negotiations or their likelihood by year-end.

I should present what these 3 sources offer rather than fabricating additional citations. The most useful approach is to acknowledge upfront that I’m working from limited search results and provide thorough analysis of what’s actually available, noting where additional sources would strengthen the response.

I need to note that the provided search results are limited for a comprehensive analysis of this forecasting question. To properly assess the likelihood of a Ukraine ceasefire or armistice by end of 2026, I would ideally need current sources on: active peace negotiations, official statements from Russia, Ukraine, and US diplomatic efforts, recent military developments, expert analysis on negotiation prospects, and any formal peace talks. The three available results touch on related topics but don’t provide detailed coverage of actual ceasefire negotiations.

Summary of Provided Sources

[1] EU $105bn Loan to Ukraine (Source: Inside Story, no date specified)
This source indicates that Ukraine is receiving substantial financial support from the EU to sustain operations through the end of 2027, suggesting the conflict is expected to continue through that period. The video discusses trade-offs between Ukraine opening a Russian oil pipeline (benefiting Russia’s revenue) in exchange for the EU loan, framing this as a long-term funding mechanism rather than immediate conflict resolution.

[2] Trump Administration Pressure for Ukraine Ceasefire (Source: NBC News, no date specified)
Ukrainian Ambassador Olga Stefanishyna appears on Meet the Press discussing Trump’s demands for an end to the Russia-Ukraine war amid concerns about weapons supply slowdowns and shortages to Ukraine. This indicates the Trump administration is actively pushing for ceasefire negotiations, though the source doesn’t detail specific negotiation status or Russian responses.

[3] Regional Tensions and Broader Geopolitical Developments (Source: Bloomberg Horizons, April 24, 2026)
This source from today discusses the Iran-Strait of Hormuz conflict, Israel-Lebanon ceasefire extension, and mentions “EU signals progress in Ukraine membership,” but provides limited detail on actual Ukraine-Russia ceasefire negotiations.

Key Information Gaps

The available sources do not provide:

• Current status of official peace talks between Russia and Ukraine
• Specific ceasefire proposals or demands from either side
• Russian government statements on negotiation willingness
• Recent developments in diplomatic channels in the past weeks
• Expert assessments of negotiation likelihood before year-end

To provide a strong forecast context, you would need recent sources from diplomatic correspondents, official statements from Russian and Ukrainian leadership, and reporting on any active negotiation tracks.

Grok response:

1. Title: Russia and Ukraine agree to 32-hour Orthodox Easter ceasefire
   Description: Al Jazeera article on the announcement of a temporary truce.
   Published: April 10, 2026
   Summary: Russia’s President Vladimir Putin announced a 32-hour ceasefire for Orthodox Easter, starting April 11 at 13:00 UTC, and President Volodymyr Zelenskyy confirmed Ukraine would reciprocate if Russia upheld it. The truce covered all directions of fighting, similar to the previous year. Both sides accused each other of minor violations post-truce, but major outlets reported it as an agreed pause.[1][2]
2. Title: Russia’s Putin announces Orthodox Easter ceasefire, Ukraine’s Zelenskiy agrees
   Description: Reuters report on Putin’s unilateral proposal and Zelenskyy’s response.
   Published: April 10, 2026
   Summary: Putin ordered Russian forces to cease fire from April 11, 16:00 Moscow time until end of April 12, proposing Ukraine do the same. Zelenskyy stated Ukraine would mirror the truce if Russia complied, emphasizing it as a step toward broader peace. This marked the first official mutual truce in recent months amid ongoing talks.[3]
3. Title: Russia and Ukraine agree to Orthodox Easter truce
   Description: BBC coverage of the 32-hour pause.
   Published: April 10, 2026
   Summary: Putin declared a ceasefire “in all directions” for Orthodox Easter, with Ukraine agreeing to reciprocate. Kyiv pushed for extension beyond the holiday but noted predefined responses to violations. The truce followed US-mediated talks but was limited in scope and duration.[4]
4. Title: The Russia-Ukraine War Report Card, April 22, 2026
   Description: Russia Matters assessment of recent military progress.
   Published: April 22, 2026
   Summary: Russian forces lost a net 2 square miles of territory from March 24–April 21 per ISW data, indicating a stalemate. No mention of ongoing ceasefire; fighting continues with incremental Russian gains in Donetsk. Casualty estimates remain high, with over 400,000 Russian losses cited from prior data.[5]
5. Title: Russian Offensive Campaign Assessment, April 19, 2026
   Description: Institute for the Study of War (ISW) daily update.
   Published: April 19, 2026 (assessment as of that date)
   Summary: Russian forces conducted limited mechanized assaults across the theater post-Easter truce. Ukrainian strikes targeted Russian rear infrastructure, stretching defenses. No broad ceasefire in effect; positional fighting persists in key areas like Kharkiv and Donetsk.[6]
6. Title: Russia x Ukraine ceasefire by end of 2026?
   Description: Polymarket prediction market odds.
   Published: Ongoing as of April 2026
   Summary: Traders assign ~26-30% probability (26¢ Yes shares) to a mutually agreed halt by Dec 31, 2026. Near-term markets like by June 30 show 8% odds, suggesting low expectation for sustained pause soon. Volume exceeds $14.5M, reflecting crowd wisdom amid stalled talks.[7][8]
7. Title: 2026 United States–Ukraine–Russia meetings in Geneva
   Description: Wikipedia summary of February diplomacy.
   Published: Ongoing entry
   Summary: Trilateral talks on Feb 17-18, 2026, followed Trump administration plans but yielded no ceasefire. Discussions focused on incremental de-escalation like energy strikes pause. Renewed efforts stalled by spring offensives and Iran conflict distractions.[9]
8. Title: Ukraine’s Zelenskiy says he stands by ceasefire proposal to Russia
   Description: Reuters on Zelenskyy’s conditional offer.
   Published: April 6, 2026
   Summary: Zelenskyy reiterated a ceasefire proposal contingent on Russia halting advances and recognizing borders. Putin has maintained demands for neutrality and territorial concessions. This preceded the Easter truce but no extension followed.[10]
9. Title: Ukraine ceasefire back in focus as US security guarantees fade
   Description: Guardian analysis of diplomatic pressures.
   Published: April 9, 2026
   Summary: Mounting casualties and uncertain US aid revive ceasefire talks, with Russia demanding Ukraine’s demilitarization. Zelenskyy seeks guarantees; Putin rejects unconditional pauses. Easter truce seen as symbolic, not strategic shift.[11]
10. Title: Russia x Ukraine ceasefire by April 30, 2026?
    Description: Polymarket short-term market.
    Published: Ongoing
    Summary: Odds at ~1.7% Yes post-Easter, indicating market views holiday truce as insufficient for resolution criteria (likely requiring sustained halt). Traders bet heavily on No amid continued offensives. Parallels other markets pricing low near-term peace.[12][13]

Current Status and Recent Developments

As of April 24, 2026, no full armistice or comprehensive ceasefire covering the entire front has been declared, with active combat reported in ISW assessments through mid-April.[6][14] The most notable event was the 32-hour Orthodox Easter truce (April 11-12), announced by Putin and reciprocated by Zelenskyy, reported widely by Reuters, BBC, Al Jazeera, and Guardian as an “official” mutual agreement to halt fighting “in all directions.”[3][4][1] Both sides accused each other of hundreds of violations during and immediately after, but it stood briefly without major escalation.[15]

Zelenskyy has repeatedly proposed extensions or unconditional ceasefires, including energy infrastructure pauses, relayed via US mediators, but Putin conditions any halt on Ukrainian concessions like neutrality, Crimean recognition, and Donbas control—demands unchanged since 2022.[10] Recent X posts from Zelenskyy (via UNITED24 Media) emphasize Ukraine’s readiness to extend pauses if Russia reciprocates, framing violations as revealing true intents.[16][17]

Military Situation

Fighting persists with slow Russian gains: net loss of 2 sq mi (March 24-April 21), but claims of full Luhansk control and ongoing Donetsk assaults.[5][18] Ukrainian strikes hit Russian oil and defenses; Russian recruitment via mercenaries continues amid sanctions pressure, though no teetering economy collapse reported in April data.[19] Prisoner swaps (e.g., 175 each pre-Easter) signal humanitarian gestures amid stalemate.[20]

Diplomatic Efforts

US-mediated Geneva talks (Feb 17-18) and Florida meetings produced no deal; stalled by Russia’s spring offensive and Iran distractions.[9][21] Zelenskyy seeks Zelenskyy-Putin summit; EU approved €90B/$106B loans (April 2026), NATO pledges $60B aid, reducing urgency for Kyiv.[22] Putin open to talks but rejects unconditional halts.[23]

Prediction Markets and Expert Views

Polymarket prices sustained ceasefire low: 26-30% by year-end, 8% by June 30, 4% by May 31—post-Easter truce, implying markets require longer/more formal halt.[7][24] X sentiment mixed: optimism for extension vs. predictions of no broad pause.[25][26] Analysts note US pressure fading without guarantees; Russia leverages stalemate.[11]

No authoritative resolution source (e.g., UN, major outlets) confirms armistice-like pause; Easter event qualifies as temporary ceasefire per reports, but war dynamics unchanged. Recent aid bolsters Ukraine, dimming near-term odds per markets.[27]

Extracted resolution criteria links:
[]

Extracted resolution criteria links:
[]

Gemini Binary response:

As a superforecaster, my goal is to provide the most accurate probability based on a careful analysis of the available data, while acknowledging uncertainty and key drivers.

Reasoning Rationale

The central question is whether a ceasefire or armistice will be officially declared between Russia and Ukraine before the end of 2026. The resolution period is from today, April 24, 2026, to December 31, 2026. The key is the broadness of the resolution criteria: “a ceasefire or armistice” that is “officially declared.” This means even a short, temporary, front-wide truce would resolve the question as “Yes.”

Arguments for a “Yes” Resolution (Higher Probability):

1. Recent Precedent: A 32-hour, mutually agreed-upon ceasefire for Orthodox Easter just occurred from April 11-12, 2026. This event, while outside the resolution window, proves that the mechanism for declaring and implementing a front-wide, official truce exists and has been used recently. It sets a strong precedent for a similar event, such as a Christmas truce, which would fall within the resolution window.
2. Military Stalemate: Recent assessments from April 2026 indicate a grinding war of attrition with minimal territorial changes, at an immense human cost. Historically, stalemates are a primary driver for opposing sides to seek pauses in fighting, even if temporary.
3. Ongoing Diplomatic Pressure: The United States has been actively involved in mediating talks, and while February 2026 meetings in Geneva yielded no deal, the diplomatic track has not been abandoned. Continued external pressure could create the conditions for a breakthrough or at least a temporary pause.

Arguments for a “No” Resolution (Lower Probability):

1. New Western Aid: Ukraine has recently secured massive new aid packages, including a €90 billion loan from the EU and a $60 billion pledge from NATO. This is arguably the most significant recent development. This aid significantly strengthens Ukraine’s ability to sustain its war effort, reducing any immediate pressure to negotiate from a position of weakness and providing an incentive to continue fighting to improve its battlefield position.
2. Irreconcilable Core Demands: Both sides’ fundamental positions for a long-term settlement remain far apart. Russia continues to demand territorial concessions and Ukrainian neutrality, which Ukraine has consistently rejected. While a temporary ceasefire doesn’t require solving these issues, the lack of progress on the core conflict makes any pause fragile and less likely.
3. Prediction Market Consensus: Prediction markets, a valuable source of aggregated wisdom, place the probability of a ceasefire by year-end at approximately 26-30%. While not a low probability, it clearly indicates that a ceasefire is considered more likely to not happen. The very low odds for a ceasefire in the immediate short-term (e.g., 8% by June 30) suggest the market believes any pause is not imminent.

Synthesis and Final Forecast:

My forecast hinges on balancing two powerful, opposing forces. On one hand, the precedent of the Easter truce makes another short, declared ceasefire (e.g., for Christmas) a distinct possibility, which would satisfy the resolution criteria. On the other hand, the massive influx of new aid to Ukraine fundamentally alters the strategic calculus for the remainder of 2026, making Ukraine less desperate for a pause and more capable of sustaining combat operations.

I assess the impact of the new aid as the more powerful of the two factors. The Easter truce occurred at a time when Ukraine’s prospects looked more uncertain; with new and substantial material support confirmed, Kyiv’s incentive to agree to any pause—even a symbolic one—is diminished, as they will likely want to leverage their new capabilities on the battlefield.

While the prediction markets sit at 26-30%, I believe they may not have fully priced in the dampening effect of these very recent aid announcements on the likelihood of negotiations in 2026. Therefore, I will adjust my forecast slightly below the market consensus. The stalemate and the possibility of another holiday truce prevent the probability from being near zero, but the new strategic reality for Ukraine makes a pause in fighting this year less likely than it was a few months ago.

Key Assumptions

1. Assumption: The new aid for Ukraine will be delivered effectively enough in 2026 to strengthen its battlefield position and reduce its willingness to agree to a ceasefire. Probability of Failure: 20%. If this fails, the probability of a “Yes” resolution would be significantly higher.
2. Assumption: Russia’s core demands and strategic posture will not fundamentally change due to internal or external shocks before year-end. Probability of Failure: 10%. If this fails, the probability could shift dramatically in either direction.

Based on this reasoning, I forecast the probability to be below the current market rate, reflecting the powerful disincentive for a ceasefire created by new military aid to Ukraine.

Probability: 24%

The extracted probability is: 24%

---

Anthropic Binary response:

Reasoning

Critical Threshold Question: Does the Easter Ceasefire Already Resolve This?

The 32-hour Orthodox Easter ceasefire (April 11-12, 2026) was:

• Officially declared by Putin and reciprocated by Zelenskyy
• Covered “all directions” of fighting
• Reported extensively by Reuters, BBC, Al Jazeera, and The Guardian
• Occurred in 2026

This appears to literally satisfy every criterion: “Resolves Yes if either a ceasefire or armistice is officially declared between Russia and Ukraine at any point in 2026, as reported by major news outlets.”

However, the question remains open 2 weeks later, and the “event must happen after today” boilerplate is present. Polymarket’s April 30 ceasefire contract traded at ~1.7% AFTER the Easter truce, suggesting markets treat temporary holiday truces as insufficient. This signals either the platform has a higher bar or the “after today” constraint is binding.

Scenario Analysis

Scenario A: Easter ceasefire already qualifies (~45% weight)

• Literal reading strongly supports resolution
• But question remaining open suggests possible non-qualification

Scenario B: Need a new ceasefire after April 24 (~55% weight)

• Polymarket prices sustained ceasefire at 26-30% by year-end
• But this question’s lower bar (any officially declared ceasefire) raises the probability significantly
• Easter precedent shows both sides willing to declare truces
• 8+ months remaining includes Christmas/New Year (potential holiday truce)
• Trump administration actively pushing for ceasefire
• Zelenskyy has repeatedly proposed extensions
• P(at least one more temporary ceasefire) ≈ 55-60%
• P(sustained ceasefire) ≈ 25-30%
• Combined P(any qualifying ceasefire after April 24) ≈ 60%

Key Assumptions That Could Change Outcome

1. Whether a 32-hour holiday truce counts as “a ceasefire” (failure probability: ~45%) — If it doesn’t count, we need something new, reducing overall probability.
2. Whether Trump’s diplomatic pressure yields results (failure probability: ~60%) — Without US pressure translating into concrete deals, sustained ceasefires remain unlikely.
3. Whether Russia’s military position incentivizes any pause (failure probability: ~50%) — If Russia sees advantage in continued fighting, even temporary truces become less likely.

Combined Calculation

P(YES) = P(Easter counts) × 0.92 + P(Easter doesn’t count) × P(new ceasefire)
= 0.45 × 0.92 + 0.55 × 0.60
= 0.414 + 0.33
= ~74%

Adjusting downward slightly for overconfidence and the ~35% historical base rate of positive resolution:

Probability: 72%
The extracted probability is: 72%

---

Anthropic Binary response:

Reasoning and Analysis

Critical Question: Does a Short Holiday Ceasefire Count?

The most important analytical issue is whether the resolution criteria would be satisfied by a brief holiday ceasefire (like the 32-hour Orthodox Easter truce of April 11-12, 2026) or requires something more substantive.

Evidence the Easter ceasefire should count:

• It was “officially declared” by both Putin and Zelenskyy
• Major outlets (Reuters, BBC, Al Jazeera, Guardian) reported it as a mutual ceasefire agreement
• The resolution criteria say “a ceasefire or armistice is officially declared… as reported by major news outlets” — no duration requirement

Evidence it doesn’t count (or was excluded):

• The question states “The event must happen after today” (April 24), explicitly excluding the Easter truce
• Polymarket prices sustained ceasefire at only 26-30% for year-end, and post-Easter short-term markets barely moved
• The spirit of the question likely implies something more than a 32-hour holiday pause

Scenario Analysis

Scenario 1: Short holiday ceasefires qualify (~45% weight)

• Precedent set by Easter 2026 and previous years’ holiday truces
• Christmas/New Year ceasefire probability: ~55-60%
• Combined with negotiated ceasefire possibility: ~60%

Scenario 2: Only substantive ceasefires qualify (~55% weight)

• Geneva talks stalled; Putin’s demands unchanged since 2022
• EU’s €90B loan and NATO’s $60B aid reduce Ukraine’s urgency
• Trump pressure hasn’t produced results despite months of effort
• Military stalemate doesn’t force either side’s hand
• 8 months remain, but base rate of 0 substantive ceasefires in 4 years of war
• Probability: ~12-15%

Key Assumptions That Could Change the Forecast

1. Definition of “ceasefire”: If a future brief holiday truce counts, probability rises to ~55%. If not, drops to ~15%. (Weighted impact: ±20%)
2. Trump escalation: If Trump dramatically escalates pressure (e.g., threatening total aid cutoff), probability rises. Current evidence suggests limited leverage. (Failure probability: ~15%)
3. Military shock: A major battlefield development could force negotiations. Current stalemate is stable. (Probability: ~10%)

Weighted Calculation

• Scenario 1 (short truces count): 0.45 × 60% = 27%
• Scenario 2 (substantive only): 0.55 × 14% = 7.7%
• Combined: ~35%

Cross-checks

• Polymarket (stricter criteria): 26-30% → my estimate should be somewhat higher given broader resolution criteria
• Historical base rate: 0 substantive ceasefires in 4 years → low
• But holiday truces have become recurring → higher if they count
• Correcting for overconfidence bias (noted in instructions)

Probability: 35%
The extracted probability is: 35%

---

Anthropic Binary response:

Reasoning and Analysis

Key Findings from Research

Easter Ceasefire Precedent (April 11-12, 2026): Both Russia and Ukraine officially declared a 32-hour ceasefire for Orthodox Easter, confirmed by Reuters, BBC, Al Jazeera, and other major outlets. However, this occurred before today (April 24), so it cannot resolve this question.

Current Military Situation: ISW reports continued fighting post-Easter with slow Russian gains (net loss of 2 sq mi March 24-April 21). No broad ceasefire in effect. Stalemate conditions persist.

Diplomatic Status: Geneva trilateral talks (Feb 17-18) yielded no deal. Zelenskyy has proposed extended ceasefires; Putin conditions any halt on neutrality, Crimea recognition, and Donbas control. Trump administration pushing but no breakthrough.

Prediction Markets: Polymarket prices a sustained ceasefire at ~26-30% by year-end. Near-term markets (June 30) at ~8%.

Critical Distinctions

The resolution criteria require ANY officially declared ceasefire after April 24 — a much lower bar than a sustained peace. However:

• Orthodox Christmas 2027 falls on January 7 — after the December 31 deadline, eliminating the most natural “holiday ceasefire” opportunity
• No obvious holiday ceasefire window exists between now and year-end (unlike Easter)
• Any ceasefire before Dec 31 would need to come from diplomatic progress, Trump pressure, or an ad hoc humanitarian pause

Probability Assessment by Pathway

Pathway	Estimated Probability
Trump-mediated temporary ceasefire	12-18%
Broader diplomatic breakthrough	8-12%
Humanitarian/ad hoc ceasefire occasion	5-8%
Military events forcing pause	3-5%

Critical Assumptions & Sensitivity

1. No natural holiday ceasefire before Dec 31: If I’m wrong and there’s a ceasefire for Western Christmas (Dec 25) or another occasion, probability rises ~10-15%. Likelihood of being wrong: ~20%.
2. Trump pressure insufficient for even temporary halt: If Trump escalates dramatically (e.g., threatening Ukraine aid cuts + offering Russia sanctions relief), probability jumps significantly. Likelihood: ~20-25%.
3. Russia’s demands remain too extreme: Even temporary ceasefires don’t require resolving territorial demands. The Easter precedent shows flexibility exists. Likelihood this blocks ALL ceasefires: ~50%.

Calibration Checks

• Polymarket sustained ceasefire: 26-30% (higher bar than this question but includes ceasefires before today)
• Adjusting down for “after April 24” requirement: -5-10%
• Adjusting up for lower bar (any ceasefire, even 24 hours): +5-10%
• Net: roughly similar to market, ~25-35%
• Historical base rate reminder: ~35% positive resolution
• Self-correction for overconfidence: slight downward adjustment

Over 8+ months, with active diplomatic pressure, Easter ceasefire precedent showing willingness, but no built-in holiday opportunity and unchanged Russian demands, I estimate a moderate probability.

Probability: 32%
The extracted probability is: 32%

GPT Binary response:

The key distinction here is between a durable war-wide settlement and the much lower bar in the resolution criteria: any officially declared ceasefire or armistice, even temporary or limited, reported by major outlets. That matters a lot.

A few points drive my forecast:

• A new ceasefire after today is required. The April 11–12 Orthodox Easter truce does not count for this forecast window, but it is still highly relevant evidence because it shows both sides can still enter a short officially declared pause that major outlets call a ceasefire.
• The default state is still continued war. ISW and other reporting show fighting resumed quickly after Easter; Russian demands remain maximalist, Ukrainian red lines remain far apart, and there is no sign of imminent agreement on a true armistice.
• But the threshold for a “Yes” is relatively low. Another short holiday truce, humanitarian pause, energy-infrastructure ceasefire, or localized/front-limited ceasefire could be enough if officially declared and widely reported.
• External pressure remains meaningful. U.S. pressure for negotiations, war fatigue, casualty burdens, and stalemate all create recurring incentives for symbolic or temporary pauses even without real political convergence.
• At the same time, the Easter truce may have been exceptional rather than trend-setting. This war has produced very few meaningful bilateral ceasefires since 2022, and both sides often use truce language instrumentally.

So I’d separate the possibilities:

1. Broad armistice / real sustained pause: still low probability.
2. Limited or temporary officially declared ceasefire: materially more plausible.
3. No further official ceasefire at all this year: still the single most likely outcome.

My rough time-slice view:

• By June 30: about 10%
• By September 30: about 22%
• By December 31: about 34%

Why not higher? Because the bargaining gap is still enormous, and even symbolic truces are rare. Why not lower? Because we already saw one qualifying-type event this year, and the resolution criteria are broad enough that a brief later truce could resolve the question positively.

Most important assumptions and how they could fail:

1. Assumption: a future short bilateral truce similar to Easter remains politically possible.
   Chance this assumption is wrong: 45%.
   If wrong, the forecast drops meaningfully because most of the “Yes” probability comes from limited pauses, not a grand bargain.
2. Assumption: the resolution will count a temporary or geographically limited officially declared ceasefire if major outlets report it.
   Chance this assumption is wrong: 15%.
   The background strongly supports this reading, but if adjudicators apply a stricter interpretation, the true probability would be lower.
3. Assumption: the war remains sufficiently stalemated that both sides keep some incentive for tactical pauses.
   Chance this assumption is wrong: 30%.
   A major breakthrough by either side could reduce incentive for ceasefire talks; though in some scenarios it could also force one.

Netting this out, I think the market-implied low odds for a substantive settlement are directionally right, but this question’s wording is somewhat easier than “durable peace.” I therefore land modestly above the probability I’d assign to a genuine armistice, but still clearly below even odds.

Probability: 34%

The extracted probability is: 34%
Task failed with error: ‘choices’
Traceback (most recent call last):
File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/main.py”, line 85, in fetch_gpt_prediction
return await fetch_sync(get_gpt_binary_prediction, title, perplexity_summary_report, asknews_summary, asknews_deep_research, vision_analysis, grok_report, adjacent_markets_research, today, resolution_date, background, fine_print, resolution_criteria)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/main.py”, line 75, in fetch_sync
return await asyncio.get_event_loop().run_in_executor(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/concurrent/futures/thread.py”, line 58, in run
result = self.fn(*self.args, *self.kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/main.py”, line 71, in run_sync return future.result(timeout=180) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/concurrent/futures/_base.py”, line 456, in result return self.__get_result() ^^^^^^^^^^^^^^^^^^^ File “/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/concurrent/futures/_base.py”, line 401, in __get_result raise self._exception File “/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/concurrent/futures/thread.py”, line 58, in run result = self.fn(self.args, **self.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/openai_service.py”, line 122, in get_gpt_binary_prediction
text = chat_completion[“choices”][0][“message”][“content”]
~~~^^^^^^^^^^^
KeyError: ‘choices’

Task failed with error: ‘choices’
Traceback (most recent call last):
File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/main.py”, line 85, in fetch_gpt_prediction
return await fetch_sync(get_gpt_binary_prediction, title, perplexity_summary_report, asknews_summary, asknews_deep_research, vision_analysis, grok_report, adjacent_markets_research, today, resolution_date, background, fine_print, resolution_criteria)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/main.py”, line 75, in fetch_sync
return await asyncio.get_event_loop().run_in_executor(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/concurrent/futures/thread.py”, line 58, in run
result = self.fn(*self.args, *self.kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/main.py”, line 71, in run_sync return future.result(timeout=180) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/concurrent/futures/_base.py”, line 456, in result return self.__get_result() ^^^^^^^^^^^^^^^^^^^ File “/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/concurrent/futures/_base.py”, line 401, in __get_result raise self._exception File “/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/concurrent/futures/thread.py”, line 58, in run result = self.fn(self.args, **self.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/openai_service.py”, line 122, in get_gpt_binary_prediction
text = chat_completion[“choices”][0][“message”][“content”]
~~~^^^^^^^^^^^
KeyError: ‘choices’

Task failed with error:
Traceback (most recent call last):
File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/main.py”, line 85, in fetch_gpt_prediction
return await fetch_sync(get_gpt_binary_prediction, title, perplexity_summary_report, asknews_summary, asknews_deep_research, vision_analysis, grok_report, adjacent_markets_research, today, resolution_date, background, fine_print, resolution_criteria)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/home/runner/work/metaculus-forecasting-llm/metaculus-forecasting-llm/src/main.py”, line 75, in fetch_sync
return await asyncio.get_event_loop().run_in_executor(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TimeoutError

All predictions: [24, 32, 35, 72]
Filtered predictions: [32, 35]

Median reasoning:

Reasoning and Analysis

Critical Question: Does a Short Holiday Ceasefire Count?

The most important analytical issue is whether the resolution criteria would be satisfied by a brief holiday ceasefire (like the 32-hour Orthodox Easter truce of April 11-12, 2026) or requires something more substantive.

Evidence the Easter ceasefire should count:

• It was “officially declared” by both Putin and Zelenskyy
• Major outlets (Reuters, BBC, Al Jazeera, Guardian) reported it as a mutual ceasefire agreement
• The resolution criteria say “a ceasefire or armistice is officially declared… as reported by major news outlets” — no duration requirement

Evidence it doesn’t count (or was excluded):

• The question states “The event must happen after today” (April 24), explicitly excluding the Easter truce
• Polymarket prices sustained ceasefire at only 26-30% for year-end, and post-Easter short-term markets barely moved
• The spirit of the question likely implies something more than a 32-hour holiday pause

Scenario Analysis

Scenario 1: Short holiday ceasefires qualify (~45% weight)

• Precedent set by Easter 2026 and previous years’ holiday truces
• Christmas/New Year ceasefire probability: ~55-60%
• Combined with negotiated ceasefire possibility: ~60%

Scenario 2: Only substantive ceasefires qualify (~55% weight)

• Geneva talks stalled; Putin’s demands unchanged since 2022
• EU’s €90B loan and NATO’s $60B aid reduce Ukraine’s urgency
• Trump pressure hasn’t produced results despite months of effort
• Military stalemate doesn’t force either side’s hand
• 8 months remain, but base rate of 0 substantive ceasefires in 4 years of war
• Probability: ~12-15%

Key Assumptions That Could Change the Forecast

1. Definition of “ceasefire”: If a future brief holiday truce counts, probability rises to ~55%. If not, drops to ~15%. (Weighted impact: ±20%)
2. Trump escalation: If Trump dramatically escalates pressure (e.g., threatening total aid cutoff), probability rises. Current evidence suggests limited leverage. (Failure probability: ~15%)
3. Military shock: A major battlefield development could force negotiations. Current stalemate is stable. (Probability: ~10%)

Weighted Calculation

• Scenario 1 (short truces count): 0.45 × 60% = 27%
• Scenario 2 (substantive only): 0.55 × 14% = 7.7%
• Combined: ~35%

Cross-checks

• Polymarket (stricter criteria): 26-30% → my estimate should be somewhat higher given broader resolution criteria
• Historical base rate: 0 substantive ceasefires in 4 years → low
• But holiday truces have become recurring → higher if they count
• Correcting for overconfidence bias (noted in instructions)

Probability: 35%

=== Forecast Result ===

{
“probability_yes”: 0.335,
“probability_yes_per_category”: null,
“continuous_cdf”: null
}

=== Reasoning ===

Reasoning and Analysis

Critical Question: Does a Short Holiday Ceasefire Count?

The most important analytical issue is whether the resolution criteria would be satisfied by a brief holiday ceasefire (like the 32-hour Orthodox Easter truce of April 11-12, 2026) or requires something more substantive.

Evidence the Easter ceasefire should count:

• It was “officially declared” by both Putin and Zelenskyy
• Major outlets (Reuters, BBC, Al Jazeera, Guardian) reported it as a mutual ceasefire agreement
• The resolution criteria say “a ceasefire or armistice is officially declared… as reported by major news outlets” — no duration requirement

Evidence it doesn’t count (or was excluded):

• The question states “The event must happen after today” (April 24), explicitly excluding the Easter truce
• Polymarket prices sustained ceasefire at only 26-30% for year-end, and post-Easter short-term markets barely moved
• The spirit of the question likely implies something more than a 32-hour holiday pause

Scenario Analysis

Scenario 1: Short holiday ceasefires qualify (~45% weight)

• Precedent set by Easter 2026 and previous years’ holiday truces
• Christmas/New Year ceasefire probability: ~55-60%
• Combined with negotiated ceasefire possibility: ~60%

Scenario 2: Only substantive ceasefires qualify (~55% weight)

• Geneva talks stalled; Putin’s demands unchanged since 2022
• EU’s €90B loan and NATO’s $60B aid reduce Ukraine’s urgency
• Trump pressure hasn’t produced results despite months of effort
• Military stalemate doesn’t force either side’s hand
• 8 months remain, but base rate of 0 substantive ceasefires in 4 years of war
• Probability: ~12-15%

Key Assumptions That Could Change the Forecast

1. Definition of “ceasefire”: If a future brief holiday truce counts, probability rises to ~55%. If not, drops to ~15%. (Weighted impact: ±20%)
2. Trump escalation: If Trump dramatically escalates pressure (e.g., threatening total aid cutoff), probability rises. Current evidence suggests limited leverage. (Failure probability: ~15%)
3. Military shock: A major battlefield development could force negotiations. Current stalemate is stable. (Probability: ~10%)

Weighted Calculation

• Scenario 1 (short truces count): 0.45 × 60% = 27%
• Scenario 2 (substantive only): 0.55 × 14% = 7.7%
• Combined: ~35%

Cross-checks

• Polymarket (stricter criteria): 26-30% → my estimate should be somewhat higher given broader resolution criteria
• Historical base rate: 0 substantive ceasefires in 4 years → low
• But holiday truces have become recurring → higher if they count
• Correcting for overconfidence bias (noted in instructions)

Probability: 35%

End