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Will there be more than 7 hurricanes of category 3 or above in the Eastern Pacific in 2026? — Above 7
28%
Agent
29%
Market Price
-0.8%
Edge
58%
Confidence
2,654
Volume
3.0c
Spread
60
Days to resolution
6
Markets in event
final rationale
Mean of 5 draws (0.31, 0.25, 0.31, 0.27, 0.27). (0) Not met: NHC's Oct 1 East Pacific summary shows 5 EPAC-only majors, which appears to include Rachel (4 on Sep 30, then 5 after Rachel's Cat 3 upgrade); Lowell and Nolo are excluded for peaking west of 140W, so 8+ needs about 3 more. (a) About two months remain (to Nov 30/Dec 1), mostly past the climatological peak. (b) Status quo leaves the count at 5, resolving NO. (c) NO: October yields one or two majors (e.g., from the 80%-chance disturbance) and November is quiet, ending at 6-7 like 1997's 7. (d) YES: a record El Nino drives a 2015/2023-style late surge, as both seasons had about 3 Oct-Nov majors. A Poisson late-season mean of about 1.5-2 majors gives P(>=3) of roughly 20-32%, plus a small allowance for counting ambiguity (the Wikipedia combined EPAC+CPAC count is already about 7). I stay near the Kalshi anchor of 29% last / 32-35 bid-ask.
price vs. prediction
market price
agent forecast at t+0
17 follow-ups
1. Planner Opus 5.5 · picks the research tools
Tools chosen:
kalshi_direct
resolution_source
wikipedia
kalshi_related
polymarket_related
Planner reasoning
The key fact is how many major (Cat 3+) Eastern Pacific hurricanes have formed so far in 2026, since about two months of season remain. The NHC tropical cyclone reports and Wikipedia's 2026 Pacific hurricane season page give the running count, and past seasons give a base rate for late-season majors. Kalshi's own market provides the price anchor, and the sibling thresholds in the same series help triangulate.
2. Research parallel tool calls + 4 web research loops (Sonnet 5) · read raw by the forecasters
at a glance
RESEARCH DIGEST (built in code: tool summaries and each report's bottom line; the forecasters read the full tool outputs and reports)
Tools
- kalshi_direct: ## This Market's Kalshi Data **Above 7** (KXHURRICANE-26DEC01EPACMAJ-7) - Current price (probability): 29.00% (live; bid 32% / ask 35%) - Last daily close (2026-10-01): 39.00% - 7-day price change: +6.00% - 30-day price change: -10.00% - Average daily volume: 236 contracts - Price range: 20.00% - 98.00% - Data points: 11 days
- resolution_source: already_resolved=unclear; matches_criteria=True; last_updated=unknown.
- wikipedia: Fetched 3 Wikipedia entries (0 missing pages).
- kalshi_related: 0 related markets / summaries. series KXHURRICANE: 0 markets (skipped 24 no-signal) | keyword 'Eastern Pacific hurricanes': no matches
- polymarket_related: Polymarket search over 2 keyword(s), kept 1 matches. keyword 'Pacific hurricane': 1 markets | keyword 'major hurricane 2026': 0 markets
Research loops, bottom lines
- current state: As of October 1, 2026, the NHC's official tally shows exactly 5 confirmed major (Cat. 3+) hurricanes in the Eastern Pacific this season (with a 6th, Rachel, recently active at major-hurricane-range intensity and possibly to be confirmed), meaning the basin needs at least 3 more (or 2, if Rachel is confirmed MH) major hurricanes before November 30 to exceed the threshold of 7 — plausible given ~2 months remain, but not yet realized.
- base rate: Historically only a small minority of eastern Pacific seasons (notably strong El Niño years like 2015 and 2023, and to the threshold in 1997) have produced more than 7 Category 3+ hurricanes in the EPAC basin proper, versus a 1991–2020 average of ~4.2; 2026 is an active El Niño season already at the average (4 EPAC-only majors) with two months of lower-climatological-activity remaining, so exceeding 7 would require an unusually active late season similar to the rare historical outliers.
- yes case: The single most likely path to YES is the imminent, NHC-forecast intensification of Hurricane Rachel into EPAC major hurricane #6 within 1–2 days (by Oct 2–3), combined with an already-flagged new disturbance (80% formation chance in 7 days) and multiple other systems under NHC watch, all occurring against a record-strength, strengthening Super El Niño that mechanistically favors major-hurricane formation in the EPAC/CPAC through December — meaning the market is closer to resolution than the sta
- no case: The NHC's own strict EPAC-attribution rule (excluding storms whose peak intensity occurred after crossing 140°W) has kept the confirmed 2026 major-hurricane count at 5 even after Rachel's Oct. 1 Category 3 upgrade, and historical analogs show that getting from 5 to 8+ majors by Nov. 30 — needing multiple new Category 3+ systems in a climatologically quieter Oct–Nov window — has only barely happened (1997) or happened in truly exceptional years (2015, 2023), making the NO outcome the structurally
tools
| tool | status | time | items | summary |
|---|---|---|---|---|
| kalshi_direct | OK | 0.2s | 1 | ## This Market's Kalshi Data **Above 7** (KXHURRICANE-26DEC01EPACMAJ-7) - Current price (probability): 29.00% (live; bid 32% / ask 35%) - Last daily close (2026-10-01): 39.00% - 7-day price change: +6.00% - 30-day price change: -10.00% - Average daily volume: 236 contracts - Price range: 20.00% - 9 |
| resolution_source | OK | 16.7s | 1 | already_resolved=unclear; matches_criteria=True; last_updated=unknown. |
| wikipedia | OK | 0.3s | 3 | Fetched 3 Wikipedia entries (0 missing pages). |
| kalshi_related | OK | 4.2s | 0 | 0 related markets / summaries. series KXHURRICANE: 0 markets (skipped 24 no-signal) | keyword 'Eastern Pacific hurricanes': no matches |
| polymarket_related | OK | 0.5s | 1 | Polymarket search over 2 keyword(s), kept 1 matches. keyword 'Pacific hurricane': 1 markets | keyword 'major hurricane 2026': 0 markets |
research loops
·
4/4 ok ·
13 searches ·
6 page reads
| dimension | status | time | searches | page reads | report |
|---|---|---|---|---|---|
| current state | OK | 30s | 2 | 2 | 4078 chars |
| base rate | OK | 44s | 4 | 2 | 4604 chars |
| yes case | OK | 30s | 3 | 1 | 5274 chars |
| no case | OK | 60s | 4 | 1 | 5116 chars |
report: current state
- [2026-10-01] Official NHC East Pacific Tropical Weather Summary table shows "2026 East Pacific Summary as of 21 UTC 1 October 2026":
Named Storms 17 (+5), Hurricanes 7 (0), Major Hurricanes 5 (+2), Total ACE (x10^4 kt^2) 176.4 (+91%)
— i.e., 5 major hurricanes (Cat. 3+) confirmed in the Eastern Pacific basin (east of 140°W) so far this season. (https://nhc.noaa.gov/data/tcr/?amp=&=&basin=epac&season=2026)
- [2026-10-01] The NHC storm-by-storm table lists five East Pacific systems reaching major hurricane (MH) intensity to date: Genevieve (24 Jul–02 Aug, 140 kt), Karina (27 Aug–07 Sep, 125 kt), Lowell (27 Aug–10 Sep, 140 kt, peak reached outside EPAC), Odalys (20 Sep–27 Sep, 115 kt), and Polo (20 Sep–29 Sep, 155 kt); a 19th system (Nineteen-E) remained a weak tropical depression through Oct 1. (https://nhc.noaa.gov/data/tcr/?amp=&=&basin=epac&season=2026)
- [2026-10-01] An additional system, Hurricane Rachel, is listed active (27 Sep–01 Oct, 100 kt, 955 mb) with major-hurricane-range winds, suggesting a 6th major hurricane in EPAC may be finalized shortly, though its status was not yet separately confirmed as "MH" in the type column at time of the fetch. (https://nhc.noaa.gov/data/tcr/?amp=&=&basin=epac&season=2026)
- [2026-10-01] Wikipedia's tracker (sourced from NHC advisories) separately corroborates:
strongest storm Polo was the second-most intense Pacific hurricane on record with 180 mph winds and 892 mbar pressure
, and the season has already produced three Category 5 hurricanes (Genevieve, Lowell, Polo), tying 1994/2002/2018 for most Cat-5s in a season. (https://en.wikipedia.org/wiki/2026_Pacific_hurricane_season)
- [2026-09-04] Earlier in the season (as of Labor Day weekend), three simultaneous hurricanes (Karina, Lowell, Marie) were active, with
Hurricane Lowell a major Category 3 storm as of that Friday with sustained winds of about 125 mph
, confirming peak-season activity was well underway by early September. (https://www.usnews.com/news/national-news/articles/2026-09-04/pacific-hurricane-hits-peak-activity-as-major-storms-rapidly-intensify)
- [2026-09-30] NHC's own basin-wide combined-activity count (including Central Pacific storms Lala) shows a combined EPAC+CPAC major-hurricane total higher than the EPAC-only figure, since Lala (13-28 Aug) reached major-hurricane status mostly within the Central Pacific. The question's resolution source (NHC/NWS) tracks EPAC and CPAC separately; the EPAC-only official count is 5 confirmed major hurricanes as of Oct 1. (https://nhc.noaa.gov/data/tcr/?amp=&=&basin=cpac&season=2026)
- [2026-10-01] NOAA's pre-season outlook (May 21, 2026) had forecast
15 to 22 named storms, with nine to 14 reaching hurricane strength, and between five and nine major hurricanes
for the Eastern Pacific — the season's current pace (17 named storms, 7 hurricanes, 5 majors) sits near the low end of that major-hurricane range but still within it.
- [2026-10-01] The Eastern Pacific season remains open until November 30, 2026, per NHC/NOAA convention
(May 15–November 30 only)
, leaving roughly two more months (October–November) for additional major hurricanes to form, though peak activity (mid-August to mid-October) is largely past per NOAA's typical climatology cited in prior reporting. (https://nhc.noaa.gov/data/tcr/?amp=&=&basin=epac&season=2026)
BOTTOM LINE: As of October 1, 2026, the NHC's official tally shows exactly 5 confirmed major (Cat. 3+) hurricanes in the Eastern Pacific this season (with a 6th, Rachel, recently active at major-hurricane-range intensity and possibly to be confirmed), meaning the basin needs at least 3 more (or 2, if Rachel is confirmed MH) major hurricanes before November 30 to exceed the threshold of 7 — plausible given ~2 months remain, but not yet realized.
NOT FOUND: A finalized/confirmed MH classification for Hurricane Rachel (active at time of last NHC update) and any NHC Tropical Cyclone Report explicitly combining EPAC+CPAC major-hurricane counts under a single "Eastern Pacific" definition for market-resolution purposes.
report: base rate
- [2026-09-30] Per NHC's official Eastern Pacific (east of 140°W) tropical cyclone report, as of 15 UTC 30 September 2026 the basin has recorded
17 (+5) named storms, 7 (0) hurricanes, 4 (+1) major hurricanes
for the season-to-date, against the 1991–2020 normal. https://www.nhc.noaa.gov/data/tcr/?season=2026&basin=epac
- [2026-09-30] NHC's own storm-by-storm table shows that of the 6 nominally "major hurricane" designations in 2026 (Genevieve, Karina, Lowell, Nolo, Odalys, Polo), two (Lowell and Nolo) are flagged "Peak Intensity Reached Outside of East Pacific," meaning they only became Cat. 3+ after moving into the Central Pacific — consistent with the official EPAC-only major count of 4. https://www.nhc.noaa.gov/data/tcr/?season=2026&basin=epac
- [2026-10-01 baseline] The reference-period (1991–2020) average eastern Pacific season produces
an average eastern Pacific hurricane season has 15 named storms, 8 hurricanes, and 4 major hurricanes
, so a season reaching "more than 7" majors (8+) is roughly double the climatological mean. https://www.noaa.gov/tropical-cyclone-climatology
- [2026-09-28] Carrier Management, citing NOAA/NHC's Rosencrans, notes
in 2015 there were nine major hurricanes, of Category 3 or higher, in the eastern Pacific
, during a comparably strong El Niño — the most recent clear precedent for a >7 outcome. https://www.carriermanagement.com/news/2026/09/28/292326.htm
- [historical] Wikipedia's EPAC-only season tables (sourced from NHC/CPHC tropical cyclone reports) show 2023 EPAC actual activity at
Actual activity: | EPAC | 17 | 10 | 8
majors, one of the few seasons besides 2015 clearly topping 7 EPAC-only majors in the modern record. https://en.wikipedia.org/wiki/2023_Pacific_hurricane_season
- [historical] By contrast, most recent seasons fall at or below the ~4 average: 2024 EPAC had
5 developed into hurricanes, of which 3 intensified into major hurricanes
; 2022 had
10 hurricanes, and four major hurricanes
; 2021 EPAC-only majors were
EPAC | 19 | 8 | 2
; and 2025 EPAC-only majors were
EPAC | 18 | 10 | 4
— none exceeding 7.
- [1997 precedent] The 1997 El Niño season, another strong El Niño analog, saw
9 hurricanes, compared to the average of 8. There were also 7 major hurricanes compared to the average of 4
— exactly at the 7 threshold, not above it.
- [record] The all-time EPAC record-high for majors in a season is
Record high activity: | | 27 | 16† | 11
, set in 2015; so "above 7" is achievable but has historically been a top-decile outcome, not typical even in active years.
- [2026-05-21 forecast] NOAA's pre-season outlook (which anticipated a strong El Niño) called for
Date: May 21, 2026 | Source: NOAA | Named storms: 15–22 | Hurricanes: 9–14 | Major hurricanes: 5–9
, so NOAA's own forecast range already spanned up through 9 majors, making a >7 final count plausible but not the forecast's central estimate.
- [current pace] With EPAC-only majors at 4 as of September 30 and the season formally running through November 30, the market needs 4+ additional EPAC-only Cat. 3+ systems in the historically less-active October–November period to resolve Yes; peak EPAC activity climatologically occurs July–September, per CPC background notes:
The official eastern Pacific hurricane season runs from 15 May through 30 November. The peak activity typically occurs during July through September.
- [note on CPAC ambiguity] If the question's "Eastern Pacific" is interpreted to include storms that reach major intensity after crossing into the Central Pacific (as the Wikipedia infobox's "combined activity" does), the season-to-date combined count is already 7 majors (EPAC 5 + CPAC 2, per Wikipedia's infobox), one short of "more than 7"; the strict NHC EPAC-only count is 4.
BOTTOM LINE: Historically only a small minority of eastern Pacific seasons (notably strong El Niño years like 2015 and 2023, and to the threshold in 1997) have produced more than 7 Category 3+ hurricanes in the EPAC basin proper, versus a 1991–2020 average of ~4.2; 2026 is an active El Niño season already at the average (4 EPAC-only majors) with two months of lower-climatological-activity remaining, so exceeding 7 would require an unusually active late season similar to the rare historical outliers.
NOT FOUND: A precise count of how many of the 36 seasons since 1991 recorded EPAC-only majors >7 (full distribution table); any formal forecaster/bettor track record specifically on this Kalshi-style "majors count" market type; NHC's final (post-season) adjudicated 2026 totals, since the season is still ongoing as of the report date.
report: yes case
YES means: more than 7 (i.e., 8 or more) Category 3+ hurricanes are confirmed by NHC/NWS to have occurred in the Eastern Pacific (east of 140°W) basin between May 15 and December 1, 2026.
- [2026-10-01] As of the NHC's 11 AM PDT Tropical Weather Outlook, Hurricane Rachel was active with 105 mph winds (Category 2) south of Baja California Sur, and the NHC forecast stated
"Rachel is expected to continue strengthening and become a major hurricane within the next couple of days."
(https://www.nhc.noaa.gov/mobile/text/refresh/MIATCPEP3+html/292342.shtml)
- [2026-10-01] A primary-source report citing NHC Discussion #18 projects Rachel's
forecast maximum sustained winds peaking at 120 mph on 3 October before gradual weakening, per NHC Discussion 18
— 120 mph easily clears the Cat.-3 (111 mph) threshold, meaning Rachel is very likely to become EPAC major hurricane #6 within days. (https://www.riotimesonline.com/mexico-hurricane-rachel-category-2-four-states-2026)
- [2026-10-01] The NHC's same-day outlook also flagged a new disturbance:
"An area of low pressure could form late this weekend or early next week south of the southern coast of Mexico... environmental conditions appear favorable for gradual development, and a tropical depression is likely to form"
with a 7-day formation chance of 80%, giving the basin another candidate storm to track toward major-hurricane status in October. (https://www.nhc.noaa.gov/gtwo.php?basin=epac&fdays=7)
- [2026-10-01] A same-day Forbes piece on the contrasting Atlantic/Pacific pattern notes
"the Pacific Basin continues to be quite active with Tropical Storm Nolo just west of the Hawaiian Islands, Hurricane Rachel to the west of Mexico and two new developing systems being monitored by NHC forecasters,"
indicating multiple additional disturbances beyond the Oct-5-day outlook already being watched for possible intensification. (https://forbes.com/sites/marshallshepherd/2026/10/01/its-october-and-not-a-single-atlantic-hurricane-has-formed)
- [2026-09-14] NOAA's Climate Prediction Center made official on September 14 that El Niño
"has now officially crossed the threshold of being a 'very strong event'... 'During the October-December 2026 season, there is a 75% chance of a historic event that would exceed the strength of previous El Niño events dating back to 1950'"
— a climate driver that directly correlates with EPAC major-hurricane activity (as colleagues' reports note for 2015/1997 analogs) and is forecast to strengthen, not weaken, through the remaining two months of the EPAC season. (https://www.fastcompany.com/91607809/2026-super-el-nino-broke-a-major-threshold-extreme-weather-impact-hurricane-storm-forecast)
- [2026-09-11 reporting, ~20 days old] A FOX Weather explainer on the mechanism driving this El Niño's Pacific intensification quotes FOX's forecast team:
"Because El Niño concentrates its deepest pool of warm water and lowest wind shear across the central and eastern Pacific, it transforms that basin into a hyper-fueled engine for major hurricanes and monster typhoons."
This supports a mechanism for continued (not just historical) major-hurricane formation through October–November, beyond the already-confirmed 5 (or imminently 6 with Rachel). (https://www.foxweather.com/weather-news/el-nino-continues-strengthen-now-75-chance-becoming-strongest-history)
- [2026-10-01] Separately, the NHC's Central Pacific outlook shows Tropical Storm Nolo still active and forecast to reach hurricane strength again, illustrating that the basin (EPAC/CPAC complex) is sustaining overlapping storms simultaneously into October, a pattern that has already produced unusually high combined ACE and storm counts for the year (named storms 17, +5 above normal, per colleagues' Oct 1 NHC figures). (https://www.nhc.noaa.gov/gtwo.php?basin=epac&fdays=7)
- [2026-10-01] A Texas state-government SOC situational briefing (dated with a forward-looking matrix through Oct 16-22) flagged
"Eastern Pacific disturbance off the coast of western Mexico has a 60% chance of development"
, corroborating that government forecasters see continuing tropical development potential well past the historical "peak" window cited by colleagues' reports. (https://olympus.soc.texas.gov/services/Sitrep/GetFile.aspx?id=15687)
BOTTOM LINE: The single most likely path to YES is the imminent, NHC-forecast intensification of Hurricane Rachel into EPAC major hurricane #6 within 1–2 days (by Oct 2–3), combined with an already-flagged new disturbance (80% formation chance in 7 days) and multiple other systems under NHC watch, all occurring against a record-strength, strengthening Super El Niño that mechanistically favors major-hurricane formation in the EPAC/CPAC through December — meaning the market is closer to resolution than the static Oct-1 "5 confirmed" headline count suggests, needing only 2 more confirmed majors (with Rachel as #6) in the remaining two months.
NOT FOUND: Official NHC confirmation that Rachel has been upgraded past Category 3 intensity (data cutoff was pre-peak-intensity); full identity/track of the "two new developing systems" referenced by Forbes; whether the disturbance south of Mexico (85% chance) that formed after Oct 1 has since developed into a named/major system.
report: no case
YES means: more than 7 (i.e., 8 or more) Category 3+ hurricanes form in the Eastern Pacific basin proper (east of 140°W), as confirmed by NHC/NWS, between May 15 and December 1, 2026.
- [2026-10-01] The NHC's own live East Pacific Tropical Weather Summary — fetched directly — shows the storm-by-storm table now includes a 15th system, "Nolo" (13 Sep–01 Oct, 135 kt), flagged with the same "^ Peak Intensity Reached Outside of East Pacific" caveat as Lowell, and despite Rachel's intensity reaching major-hurricane strength (100 kt) and being added to the table as "MH," the official EPAC-only major count remained at exactly 5 (+2) — confirming NHC's strict east-of-140°W attribution methodology continues to filter out apparent majors, keeping the resolvable count below naive storm-tallies. (https://nhc.noaa.gov/data/tcr/?amp=&=&basin=epac&season=2026)
- [2026-10-01] AP/WSAZ reporting confirms Rachel was "upgraded to a Category 3 storm" on Oct. 1 but is "expected to strengthen in the next day before weakening this weekend," meaning its major-hurricane window is brief and its contribution to the final adjudicated EPAC tally is not yet locked in a Tropical Cyclone Report. (https://www.wsaz.com/2026/10/01/hurricane-rachel-strengthens-category-3-storm-off-mexicos-pacific-coast/)
- [2026-10-01] Even in the record 2015 season — the closest modern analog, also a very strong El Niño year — two of its latest-forming majors, Patricia (Oct 20–24) and Sandra, which "became the latest major hurricane observed in the eastern Pacific since reliable records began in 1971," only pushed the season over the threshold late; Sandra's Nov 25–26 Cat-3/4 peak was explicitly called a record-latest event, underscoring how rare it is for the basin to produce multiple additional majors after October 1 even in banner years. (https://www.kold.com/story/30655399/2015-hurricane-season-summary/, https://gpm.nasa.gov/node?page=636)
- [2026-09-29] NOAA CPC's Global Tropical Hazards Outlook (issued Sept. 29, valid through Oct. 20) does flag continued favorable conditions and a "40-60% chance of TC genesis" near the Mexican coast, but this signals only genesis of new tropical systems, not confirmed intensification all the way to Category 3+, which historically has a much lower conditional probability per named storm. (https://www.cpc.ncep.noaa.gov/products/precip/CWlink/ghaz/index.php)
- [2026-10-01] NHC's own climatology page states plainly that "most tropical cyclones" in the basin occur "between late June and early October," meaning the two remaining resolution months (October–November) fall mostly outside the basin's historically most productive window, raising the bar for the 3 additional majors (or 2, if Rachel is finalized as EPAC-attributed) still needed. (https://www.nhc.noaa.gov/climo/)
- [2026-10-01] The NHC/CPC 1991–2020 baseline of "4 major hurricanes" per average season (confirmed directly on NHC's climatology page) means 2026's current major-hurricane count is already only one above average even after a historically front-loaded, named-storm-heavy season (17 storms, +5 vs normal), suggesting the extreme named-storm pace has not translated proportionally into EPAC-attributed majors. (https://www.nhc.noaa.gov/climo/)
- [2026-10-01] CPC's ENSO Diagnostic Discussion confirms El Niño is still strengthening with a "greater than 90% chance of a very strong event" this fall/winter — while bullish for activity generally, this also means the El Niño's peak oceanic forcing is still building toward winter, historically a period when EPAC genesis itself (not just intensification) drops off sharply regardless of SST state, since the basin's own season climatologically closes by Nov 30. (https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/ensodisc.shtml)
- [historical check] Among comparable strong-El-Niño precedents, 1997 finished at exactly 7 EPAC majors (per colleague's base-rate research) — not above — illustrating that even a "textbook" strong El Niño analog has landed right at the threshold rather than exceeding it, a cautionary precedent for 2026 given its similar current pace (5 confirmed, needing 3 more).
BOTTOM LINE: The NHC's own strict EPAC-attribution rule (excluding storms whose peak intensity occurred after crossing 140°W) has kept the confirmed 2026 major-hurricane count at 5 even after Rachel's Oct. 1 Category 3 upgrade, and historical analogs show that getting from 5 to 8+ majors by Nov. 30 — needing multiple new Category 3+ systems in a climatologically quieter Oct–Nov window — has only barely happened (1997) or happened in truly exceptional years (2015, 2023), making the NO outcome the structurally favored one absent a further, still-unconfirmed late-season surge.
NOT FOUND: A finalized NHC Tropical Cyclone Report locking in Rachel's final category and EPAC-vs-CPAC attribution; a precise count of how many EPAC-only majors 2015 or 1997 had already accumulated by October 1 for a like-for-like pace comparison; any explicit NOAA/NHC monthly breakdown of major-hurricane formation rates for October and November specifically.
3. Forecasters 5 draws · Opus 5.5 + GPT-5.6 Sol · plain mean
claude-opus-5-5
50% conf
| Yes | 31% |
| No | 69% |
(0) Not met: NHC's Oct 1 East Pacific summary shows 5 EPAC-only majors, which appears to include Rachel (4 on Sep 30, then 5 after Rachel's Cat 3 upgrade); Lowell and Nolo are excluded for peaking west of 140W, so 8+ needs about 3 more. (a) About two months remain (to Nov 30/Dec 1), mostly past the climatological peak. (b) Status quo leaves the count at 5, resolving NO. (c) NO: October yields one or two majors (e.g., from the 80%-chance disturbance) and November is quiet, ending at 6-7 like 1997's 7. (d) YES: a record El Nino drives a 2015/2023-style late surge, as both seasons had about 3 Oct-Nov majors. A Poisson late-season mean of about 1.5-2 majors gives P(>=3) of roughly 20-32%, plus a small allowance for counting ambiguity (the Wikipedia combined EPAC+CPAC count is already about 7). I stay near the Kalshi anchor of 29% last / 32-35 bid-ask.
claude-opus-5-5
50% conf
| Yes | 25% |
| No | 75% |
(0) Not yet met: the NHC EPAC summary at 21 UTC Oct 1 shows 5 majors, up from 4 on Sep 30 (Genevieve, Karina, Odalys, Polo; Lowell and Nolo flagged as peaking outside EPAC). The +1 most likely reflects Rachel's Oct 1 Cat 3 upgrade, so 8+ needs three more majors, or two if Rachel isn't yet counted. (a) About two months remain to Nov 30/Dec 1, past the July–September peak. (b) Status quo of 5–6 majors resolves No. (c) No: October yields at most one major, the 80%-chance disturbance tops out below Cat 3, November is quiet, and the season ends at 5–7, like 1997's 7. (d) Yes: the record El Niño sustains low shear and warm water, as in 2023 and 2015, and the new disturbance plus one or two follow-on systems become Cat 3+ east of 140°W. Two or three post-Oct-1 majors happen only in exceptional El Niño years, and 2026 is one, but strict EPAC attribution filters out storms like Nolo and Lala. Anchoring on Kalshi's ~29–35%, I shade slightly lower given the likely Rachel-included count.
claude-opus-5-5
50% conf
| Yes | 31% |
| No | 69% |
(0) Not met: NHC's official East Pacific summary at 21 UTC Oct 1 shows 5 major hurricanes, most likely already including Rachel's Oct 1 Category 3 upgrade. Lowell and Nolo are excluded because they peaked west of 140°W, so 3+ more majors east of 140°W are needed. (a) About two months remain (to Nov 30/Dec 1), climatologically past peak. (b) Status quo leaves 5-6 majors, which resolves No. (c) No: Rachel weakens, the new disturbance (80% 7-day formation chance) yields at most one more major, and the season ends around 6-7 like 1997 (exactly 7). (d) Yes: the record-strength El Niño sustains low shear and warm water, producing three more Oct-Nov majors as in 2015 (Olaf/Patricia/Sandra) and 2023 (Lidia/Norma/Otis). A small extra weight goes to a looser resolution that counts Central Pacific majors (which would already give 8+), though the market and source suggest the strict NHC count. Anchoring on Kalshi at 29% live (32/35 bid/ask, 39% last close), I land slightly above the last trade at the low end of that range.
gpt-5.6-sol
68% conf
| Yes | 27% |
| No | 73% |
(0) The condition has not already been met: the October 1 NHC East Pacific summary reports only 5 qualifying major hurricanes, so at least 3 more must be attributed to the Eastern Pacific before December 1. (a) Roughly two months remain, although NHC climatology says most basin activity occurs by early October. (b) If nothing changes, the count remains 5 and the market resolves No. (c) No results if the currently monitored disturbances fail to reach Category 3, or if storms reach major intensity only after crossing into the Central Pacific, as happened with some apparent 2026 majors. (d) Yes requires an exceptional late-season surge producing three additional EPAC-attributed majors; the very strong El Niño, elevated ACE, and continued disturbance formation provide a credible route. I anchor on Kalshi's 29% Yes price but shade it to 27% because the strict NHC basin attribution and the rare historical base rate for 8 or more majors slightly outweigh the favorable near-term development environment.
gpt-5.6-sol
70% conf
| Yes | 27% |
| No | 73% |
(0) The resolving condition is not already met: NHC’s October 1 East Pacific summary reports 5 qualifying major hurricanes, including Rachel, so three more EPAC-attributed Category 3+ hurricanes are required to reach the Yes threshold of 8. (a) About 61 days remain until December 1, although NHC climatology says most basin activity occurs by early October and the conventional season ends November 30. (b) If nothing changes, the count remains 5 and the market resolves No. (c) No results if current disturbances fail to become major hurricanes, or if storms reach major intensity only after crossing 140°W, as happened with systems excluded by NHC’s strict EPAC attribution. (d) Yes requires an exceptional late-season surge producing three additional qualifying majors, supported by the strengthening El Niño, elevated ACE, and at least one disturbance with a high near-term formation chance. I anchor near Kalshi’s 29% Yes price but lower it modestly to 27% because surpassing seven is historically rare, 1997 reached only seven, and three late-season majors remain a demanding requirement despite favorable conditions.
4. Final plain mean of 5 draws
28%
(58% confidence)
Yes: 28%
No: 72%
Mean of 5 draws (0.31, 0.25, 0.31, 0.27, 0.27). (0) Not met: NHC's Oct 1 East Pacific summary shows 5 EPAC-only majors, which appears to include Rachel (4 on Sep 30, then 5 after Rachel's Cat 3 upgrade); Lowell and Nolo are excluded for peaking west of 140W, so 8+ needs about 3 more. (a) About two months remain (to Nov 30/Dec 1), mostly past the climatological peak. (b) Status quo leaves the count at 5, resolving NO. (c) NO: October yields one or two majors (e.g., from the 80%-chance disturbance) and November is quiet, ending at 6-7 like 1997's 7. (d) YES: a record El Nino drives a 2015/2023-style late surge, as both seasons had about 3 Oct-Nov majors. A Poisson late-season mean of about 1.5-2 majors gives P(>=3) of roughly 20-32%, plus a small allowance for counting ambiguity (the Wikipedia combined EPAC+CPAC count is already about 7). I stay near the Kalshi anchor of 29% last / 32-35 bid-ask.
Pipeline Timing
Total pipeline time: 131.2s
Per-tool research timings shown in the Research section above.