Scan: US strike on Cuba by December 31?

date	predicted	market price	confidence
2026-08-25	10%	16%	55%
2026-08-18	15%	18%	60%
2026-08-08	12%	22%	50%

1. Planner Fable 5.1 · Fermi decomposition + tool plan

Tools chosen: polymarket_direct polymarket_related kalshi_related article_search claude_news gdelt_news wikipedia code_execution

Sub-questions (Fermi decomposition)

Has any US drone, missile, or air strike on Cuban terrestrial territory already been credibly reported or claimed by the US government in 2026?
Has the Trump administration (Trump, Rubio, Hegseth, Pentagon) explicitly threatened or signaled military action against Cuba, e.g., framing Cuba as a narco-state, terrorist sponsor, or target after Venezuela operations?
What US military strikes has the Trump administration conducted in Latin America since 2025 (Venezuela boat strikes, land strikes, Mexico cartel strikes), and does that precedent extend to Cuba?
Is there a US military buildup in the Caribbean or around Guantanamo/Cuba (carriers, bombers, drones) that would indicate operational preparation for strikes on Cuba?
How do related Polymarket and Kalshi markets price US strikes on Venezuela, Mexico, Colombia, and Cuba regime change or US invasion of Cuba, and how has this market's price trended over recent months?
What is the hazard-rate implied by the current price given the remaining time to Dec 31, 2026, and how does it compare to the historical base rate of zero US strikes on Cuban soil since the 1960s?

Planner reasoning

This is a Polymarket tail-risk geopolitics question; the market price is the primary anchor, and the key drivers are whether the Trump administration has escalated rhetoric or operations against Cuba (as it did with Venezuela), whether any strike has already been credibly reported, and how much time remains. Cross-market prices on US strikes against Venezuela/Mexico and Cuba regime-change markets give correlated signals, and news search establishes the current escalation trajectory.

2. Research Parallel tool calls

tool	status	time	items	summary
polymarket_direct	OK	0.4s	1	## This Market's Polymarket Data US strike on Cuba by December 31? - Current price (probability): 15.00% - 7-day price change: +1.50% - 30-day price change: -1.50% - Total volume: $5,231,498 (USD notional) - Price range: 13.50% - 47.00% - Data points: 90 days
polymarket_related	OK	0.5s	8	Polymarket search over 5 keyword(s), kept 8 matches. keyword 'Cuba': 5 markets \| keyword 'strike on Venezuela': 2 markets \| keyword 'strike on Mexico': 0 markets \| keyword 'Cuba regime': 1 markets \| keyword 'invade Cuba': 0 markets
kalshi_related	OK	4.8s	2	2 related markets / summaries. keyword 'Cuba': no matches \| keyword 'US strike Venezuela': ok \| keyword 'military action Cuba': ok
article_search	OK	47.0s	19	Fetched 19 unique articles across 5 queries (lookback=45d). 'US military strike Cuba': 10 articles \| 'Trump Cuba military action threat': 10 articles \| 'Rubio Cuba regime change': 10 articles \| 'US strikes Venezuela land targets': 10 articles \| 'Caribbean military buildup Pentagon Cuba': 10 articles
claude_news	OK	21.6s	13	## Key Findings: US Strike on Cuba Question Precedent — Venezuela strikes (Jan 2026): - US special forces conducted a raid on Nicolás Maduro's Caracas residence on Jan 3, 2026, capturing him; Cuba's government confirmed that 32 members of its security forces were killed during the US strikes i
gdelt_news	OK	211.7s	20	GDELT: 20 articles across 4 queries (lookback=30d). 'Cuba US strike': 10 hits \| 'Cuba Trump military': error GDELT rate-limited after retries (429) \| 'Cuba Pentagon': 10 hits \| 'Cuba narco terrorism designation': error GDELT rate-limited after retries (429)
wikipedia	OK	0.4s	3	Fetched 3 Wikipedia entries (1 missing pages).
code_execution	OK	22.5s	0	## Key Findings Time frame: Given system date of 2026-09-19, there are ~103 days (3.38 months) remaining until the 2026-12-31 23:59 ET deadline. Market-implied monthly hazard rates (assuming constant hazard, solving `h = 1-(1-P)^(1/3.384)`): - YES = 5% → monthly hazard ≈ 1.50% (ann

3. Evidence Brief Sonnet 5 · 7034 chars

# Current state No US strike on Cuban soil has occurred or been credibly reported as of mid-September 2026. Policy remains centered on sanctions, indictments (Raúl Castro), and rhetorical/military pressure (Nimitz carrier group, drone surveillance) rather than kinetic action; Pentagon officials explicitly say no strike/invasion is "imminent" or "resourced" despite contingency tabletop planning. [Wikipedia/Axios/CSIS] # Timeline of key events - 2026-01-03: US special forces raid Maduro's Caracas residence, capturing him (Venezuela, not Cuba) — confirmed [Wikipedia: 2026 Cuban crisis] - 2026-01 (after raid): Cuba's government confirms 32 of its security personnel killed during US strikes in Venezuela; declares 2 days of mourning; triggers "2026 Cuban crisis" narrative of US regime-change intent toward Cuba by year-end — reported [Wikipedia] - 2026-05-20: USS Nimitz Carrier Strike Group enters the Caribbean Sea — reported [armyrecognition.com] - 2026-05-22: Trump and Rubio issue fresh threats of military action against Cuba; Trump says "it looks like I'll be the one that does it" — confirmed via multiple outlets [Al Jazeera, NPR] - 2026-05-27/28: Politico/Axios report months of Pentagon positioning (troops, ships, aircraft) for a rapid Cuba option; SOUTHCOM runs multiagency tabletop exercise; official says "no invasion is planned or imminent" — reported [Politico/Axios] - 2026-05 (mid-late): US unveils charges tied to 1996 Brothers to the Rescue shootdown; P-8A Poseidon/MQ-4C Triton surveillance flights increase around Cuba — reported [armyrecognition.com] - 2026-06-20: Trump again raises possibility of military intervention in Cuba — reported [AFP] - 2026-08 (late): US indicts Raúl Castro over the 1996 plane downing — reported [CBC/Front Burner] - 2026-08-17: CNN analysis lists Cuba among 7 countries Trump has "threatened without actually striking" — reported [CNN] - 2026-09 (early): CSIS assesses US retains capability for punitive strikes via Nimitz presence but notes force levels below Dec 2025/Jan 2026 peak; no operation resourced — reported [CSIS] - 2026-09-05: State Dept./Treasury announce further sanctions on Cuba's mineral wealth and military-modernization apparatus (EO 14404) — confirmed [State.gov] # Event Will a US-initiated drone, missile, or air strike physically impact Cuban terrestrial soil (excluding intercepts/SAMs, artillery, ground incursions, naval shelling, cyberattacks) by Dec 31, 2026? # Outcomes to forecast Yes / No # Kalshi market anchor Kalshi-linked Polymarket data (same ticker) shows current YES price 15.00%, up +1.5% over 7 days but down -1.5% over 30 days. 90-day range was wide (13.5%–47%), meaning the market has cooled substantially from an earlier spike (likely tied to Jan 2026 Venezuela raid/Cuba mourning period or May 2026 threat cycle) down to the 13–15% band. Volume is heavy ($5.23M), indicating active, liquid pricing — a meaningful consensus, not noise. # Resolution source Not run (no resolution_source tool result present in raw research). # Sub-question answers 1. **Has any US strike on Cuban soil already occurred/been claimed in 2026?** No. All confirmed kinetic US action in the region has targeted Venezuela (Maduro raid) or narco-boats in Caribbean/Pacific waters, not Cuban land. [Wikipedia, CNN, CBS News] 2. **Has Trump admin explicitly threatened Cuba?** Yes — Trump and Rubio both issued explicit threats (May 22, June 20, 2026), framing Cuba as tied to Russia/China security threats and hinting Trump could be the president who "finally" acts. [Al Jazeera, NPR] 3. **Precedent from Latin America strikes extending to Cuba?** Extensive precedent exists: 67+ narco-boat strikes since Sept 2025 ("Operation Southern Spear"), Maduro capture raid, and Hegseth negotiating land-strike rights in Colombia/Guatemala/Honduras — but no equivalent land-strike authorization or action reported for Cuba specifically. [CBS News, CNN] 4. **Military buildup near Cuba/Guantanamo?** Yes — USS Nimitz carrier strike group in Caribbean since May 20, 2026; increased P-8A/MQ-4C Triton surveillance flights; SOUTHCOM tabletop exercises for Cuba contingencies. [armyrecognition.com, Axios] 5. **Cross-market pricing?** Related Polymarket markets: "US invade Cuba in 2026" 6.5% YES; "US x Cuba military clash 2026" 15% YES; "Cuban regime falls in 2026" 12.5%; "US strike Mexico" 11%; "US strike Colombia" 16%. This "US strike on Cuba" market itself trended from a 47% peak down to 13.5%, now 15%. 6. **Hazard rate vs. base rate?** At 15% YES with ~103 days left, implied monthly hazard ≈4.7% (annualized ~44%) — roughly 35x the historical Laplace base rate (~0.13%/month, 64 years with zero strikes). Market is pricing substantial event-driven risk far above historical norm. [code_execution] # Key facts (high-confidence, factual) 1. [Wikipedia] Cuba confirmed 32 security personnel deaths tied to Jan 2026 Venezuela operation; declared mourning. 2. [armyrecognition.com] Nimitz carrier group in Caribbean since May 20, 2026. 3. [NPR/Al Jazeera] Trump/Rubio explicit threats, May 22, 2026. 4. [State.gov] New Cuba sanctions Sept 5, 2026 — economic, not kinetic. 5. [CSIS] No invasion "resourced" as of Sept 2026; force levels below Dec2025/Jan2026 peak. # Cross-market signals - Kalshi related: No direct Cuba matches found; tangential markets irrelevant. - Polymarket: This market 15% YES, cooled from 47% peak; "invade Cuba 2026" only 6.5%, suggesting traders differentiate a limited "strike" (broader definition, includes claimed strikes) from full "invasion." - Sportsbook implied: N/A. # Analyst opinions and speculation - CSIS (Sept 2026): US retains rapid strike capability via Nimitz; any campaign would likely target drone/intel sites and air defenses first. - CNN (Aug 17): Cuba grouped with Colombia, Mexico, Panama, Oman, Canada, Greenland as "threatened but not struck" — Trump makes frequent threats, low follow-through rate historically. - Axios/Pentagon: contingency planning exists but "no invasion planned or imminent." # Directional lean per outcome - **Yes**: Elevated rhetoric, naval buildup, indictments, Venezuela precedent, and administration explicitly discussing invasion — real tail risk exists. - **No**: 64-year historical base rate of zero strikes; explicit Pentagon statements no operation is resourced/imminent; policy focus remains sanctions/indictments; market price has fallen from 47% to 15%, reflecting de-escalation from earlier peak. # Gaps / unknowns - No article confirms any land-based Cuba strike claim as of Sept 19, 2026. - Unclear what triggered the market's earlier 47% peak vs. current 15%. - No visibility into classified strike authorization status post-September. # Calibration anchors - Kalshi/Polymarket current YES: 15% (down from 47% peak, up slightly recently). - Historical base rate: 0 US strikes on Cuban soil since 1961; Laplace-implied ~1.5%/year, ~0.4% for remaining window — market price (15%) implies far higher risk than raw history, reflecting genuine 2026 escalation context.

4. Forecasters 5 draws · Fable 5.1 + GPT-5.6 Sol

claude-fable-5-1

56% conf

Yes	11%
No	89%

No US strike on Cuban soil has occurred as of mid-September 2026, and Pentagon/CSIS statements indicate no operation is resourced or imminent, with force levels below the Dec 2025/Jan 2026 peak. The Kalshi-linked anchor sits at 15% YES, having cooled sharply from a 47% peak as the May threat cycle failed to produce kinetic action, and current policy is centered on sanctions (Sept 5 EO 14404) and indictments (Raúl Castro) rather than strikes. Trump's documented pattern of threatening without striking (CNN's seven-country list), plus only ~103 days remaining, argues for a modest discount below the market, though the Venezuela precedent, Nimitz presence, and contingency planning keep a real tail. I land slightly under the market at 11% YES.

claude-fable-5-1

58% conf

Yes	12%
No	88%

No US strike on Cuban soil has occurred as of mid-September 2026, and Pentagon/CSIS sources state no operation is 'resourced' or 'imminent,' with regional force levels below the Dec 2025/Jan 2026 peak and policy focused on sanctions (Sept 5 EO 14404) and indictments (Raúl Castro). The market anchor is 15% YES, having cooled from a 47% peak, and CNN groups Cuba among countries Trump has repeatedly threatened without striking. Genuine tail risk remains given the Venezuela raid precedent, Nimitz presence, and explicit Trump/Rubio threats, so I stay near the anchor but shade slightly lower given ~103 days remaining and the clear de-escalation trend in both force posture and market pricing.

claude-fable-5-1

55% conf

Yes	12%
No	88%

No US strike on Cuban soil has occurred as of mid-September 2026, and policy remains sanctions/indictments (Sept 5 EO 14404 sanctions, Raúl Castro indictment) with Pentagon and CSIS explicitly stating no operation is resourced or imminent and force levels are below the Dec 2025/Jan 2026 peak. The Kalshi/Polymarket anchor is 15% YES, having cooled from a 47% peak, and cross-market pricing ('invade Cuba' 6.5%, 'military clash' 15%) is consistent with a low-but-real tail. The Venezuela precedent and repeated Trump/Rubio threats keep genuine event risk above the ~0.4% historical base rate, but CNN's 'threatened without striking' pattern and the ~103-day window argue for slight discount to the market. I shade modestly below the anchor to 12%.

gpt-5.6-sol

69% conf

Yes	13%
No	87%

The 15% Kalshi-linked YES price is the primary anchor, supported by heavy volume and related military-clash pricing. Explicit Trump and Rubio threats, the Nimitz deployment, enhanced surveillance, and Cuba contingency exercises create a genuine strike tail risk, especially given recent US kinetic action elsewhere in the region. However, no strike has occurred, officials say no operation is imminent or resourced, force levels have declined, and current policy remains focused on sanctions and indictments. These factors justify moving modestly below the market consensus to 13% YES while retaining substantial event-driven risk above the historical base rate.

gpt-5.6-sol

70% conf

Yes	14%
No	86%

The 15% Kalshi-linked YES price is a strong anchor given $5.23M in volume and the market’s cooling from an earlier 47% peak. Explicit Trump and Rubio threats, the Nimitz deployment, increased surveillance, and Cuba contingency exercises create a genuine limited-strike tail risk, especially after the Venezuela operation. However, no strike has occurred, officials say no operation is imminent or resourced, force levels have declined, and recent policy has emphasized sanctions and indictments. I therefore place YES slightly below the market consensus at 14%.

6. Final plain mean of 5 draws

12% (62% confidence)

Yes: 12% No: 88%

Mean of 5 draws (0.11, 0.12, 0.12, 0.13, 0.14). No US strike on Cuban soil has occurred as of mid-September 2026, and Pentagon/CSIS statements indicate no operation is resourced or imminent, with force levels below the Dec 2025/Jan 2026 peak. The Kalshi-linked anchor sits at 15% YES, having cooled sharply from a 47% peak as the May threat cycle failed to produce kinetic action, and current policy is centered on sanctions (Sept 5 EO 14404) and indictments (Raúl Castro) rather than strikes. Trump's documented pattern of threatening without striking (CNN's seven-country list), plus only ~103 days remaining, argues for a modest discount below the market, though the Venezuela precedent, Nimitz presence, and contingency planning keep a real tail. I land slightly under the market at 11% YES.

Pipeline Timing

Total pipeline time: 286.3s

Per-tool research timings shown in the Research section above.