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Will Keiko Fujimori and Jorge Nieto be the nominees in the 2026 Peru presidential election? — Keiko Fujimori vs. Jorge Nieto

KXPERUPRESMATCHUP-26APR-KFUJJNIE · Elections · 2026-04-15
3%
Agent
4%
Market Price
-1.0%
Edge
82%
Confidence
Volume: 67,956
Spread: 2.0c
Days to resolution: 362
Markets in event: 15
Final Rationale
With 62% of Peru's first-round ballots counted, Fujimori leads at ~16.88% and López Aliaga is second at ~13.88%, with Nieto not among named contenders. The Devil's Advocate correctly identified that (1) Nieto's exact vote share is unknown (inference from absence), (2) the 362-day resolution window introduces disqualification/withdrawal scenarios, and (3) the López Aliaga second-place market at 65% implies ~35% chance someone else finishes second. These pushed my estimate from 1.3% to 3%. I remain below the market's 5% because the orderbook depth is very low (4 data points), the partial count evidence is strong against Nieto, and even distributing the residual uncertainty generously gives Nieto only ~1-2% of the non-López Aliaga scenarios multiplied by Keiko's ~92% advancement probability.
Price vs. prediction
How the market moved after the agent's call. Solid blue line is the actual market price; dashed line is the agent's static forecast at $t{=}0$.
$n = 58$ follow-ups
1. Planner Opus · Fermi decomposition + tool plan
Tools chosen: kalshi_data article_search web_search wikipedia_lookup code_execution
Sub-questions (Fermi decomposition)
  1. Will Keiko Fujimori qualify as a nominee/advance to the second round in the 2026 Peru presidential election? (w=0.40)
  2. Will Jorge Nieto qualify as a nominee/advance to the second round in the 2026 Peru presidential election? (w=0.35)
  3. Will BOTH Keiko Fujimori AND Jorge Nieto simultaneously advance (making this the exact runoff matchup)? (w=0.25)
Planner reasoning
This question asks whether a very specific runoff matchup (Keiko Fujimori vs. Jorge Nieto) will materialize in Peru's 2026 presidential election. Peru uses a two-round system where the top two vote-getters advance to a runoff. Key analytical challenges: (1) Keiko Fujimori is a perennial candidate with a strong base (~20% historically) but faces ongoing legal issues that could disqualify her; (2) Jorge Nieto is a less prominent figure whose polling numbers and candidacy status need verification; (3) Peru's elections are notoriously fragmented with 10-20+ candidates, making any specific pair outcome low-probability a priori. The temporal analysis matters: the first round is expected in April 2026, so we are essentially at/just before the first round. Resolution is in April 2027, covering the full cycle including any runoff. For YES to resolve: both candidates must (a) be legally eligible and registered, (b) not withdraw, and (c) finish in the top 2. Keiko's probability of advancing is moderate (~40-60% given her track record but legal vulnerabilities); Nieto's is much lower without established polling support. The joint probability of this specific matchup is likely quite low (5-15%) unless recent polls show Nieto as a frontrunner. Reference class: in 2016 Keiko advanced; in 2021 she advanced again despite competitive field — suggesting structural durability. But Nieto's advancement requires him to outperform ~8-15 other candidates.
2. Research Parallel tool calls · legacy v2
ToolStatusTimeItemsSummary
kalshi_data OK 2.2s -
article_search OK 0.1s -
web_search OK 77.1s -
wikipedia_lookup OK 1.3s -
code_execution OK 0.0s -
3. Evidence Synthesis Sonnet · 12 items · legacy v2
#StrengthCredibilityDirectionSourceClaimPriced In
1 STRONG 88 ↑ UP web_search Exit polls and partial counts from April 12-13, 2026 showed Keiko Fujimori leading the first round with approximately 16.6-16.88% of the vote, ahead of all other candidates in a 35-candidate field. No
2 STRONG 85 ↑ UP web_search As of April 14-15, 2026 with 62% of ballots tallied, Fujimori and López Aliaga were leading, but the two runoff contenders had not yet been officially confirmed. No
3 STRONG 92 ↑ UP wikipedia_lookup Keiko Fujimori is confirmed as a 2026 presidential candidate running for the fourth time, having advanced to the second round in 2016 and 2021. Yes
4 MODERATE 80 ↑ UP web_search A record 34-35 registered candidates entered the presidential race by December 2025, creating a highly fragmented field where Fujimori's ~17% share is likely sufficient to advance. Yes
5 STRONG 85 ↓ DOWN web_search Early exit poll results (April 12-13, 2026) showed second place going to Roberto Sánchez (12.1%) and third to Ricardo Belmont (11.8%), with no mention of Jorge Nieto in the leading positions. No
6 STRONG 85 ↓ DOWN web_search With 62% of ballots tallied, Keiko Fujimori and Rafael López Aliaga led the count with 16.88% and 13.88% respectively; Jorge Nieto is not mentioned among the leading candidates. No
7 WEAK 60 ↓ DOWN wikipedia_lookup Jorge Nieto Montesinos is described only as a 'Peruvian sociologist and politician' with no detail on polling position, vote share, or prominence in the 2026 race. Yes
8 STRONG 80 ↓ DOWN kalshi_data The Kalshi market for Rafael López Aliaga finishing second in the first round is priced at 65% (up 30 points in 7 days), strongly suggesting the expected runoff is Fujimori vs. López Aliaga, not Fujimori vs. Nieto. No
9 STRONG 75 ↓ DOWN kalshi_data The Kalshi market for the specific Fujimori vs. Nieto matchup is priced at 5%, with a 30-day low of 3% and a high of 20%, currently near the lower end of its range. No
10 STRONG 87 ↓ DOWN web_search The emerging runoff appears to be between Keiko Fujimori and Rafael López Aliaga based on partial counts and exit polls, directly contradicting the Fujimori-Nieto matchup scenario. No
11 WEAK 35 ↓ DOWN code_execution A base-rate model estimated the probability of the specific Fujimori-Nieto matchup at approximately 11%, based on assumed P(Keiko advances)=0.55 and P(Nieto advances | Keiko advances)=0.20. Yes
12 STRONG 85 ↓ DOWN web_search With 62% of ballots counted, the two top candidates were Fujimori (~16.88%) and López Aliaga (~13.88%), with Nieto not featured among named leading candidates, making the Fujimori-Nieto matchup highly unlikely. No
Information Gaps
  • Jorge Nieto's actual vote share in the April 12-13, 2026 first round is not reported in available data — only that he is not among the named front-runners.
  • Final official vote totals (only 62% counted as of latest data) — results could technically shift, though a 3-point gap between López Aliaga and other candidates makes an overturn less likely.
  • No data on Jorge Nieto's polling trajectory in the months prior to the election, making it impossible to assess if he had a late surge.
  • Whether Keiko Fujimori faces any last-minute legal disqualification attempts is not addressed in the data.
  • No information on whether the Kalshi market for 'Fujimori vs. Nieto' was priced at 20% at some earlier point and has since collapsed as actual results emerged.
Key Uncertainties
  • Whether the remaining ~38% of uncounted ballots could dramatically change the standings and somehow elevate Nieto into second place (very unlikely given the reported gap).
  • Whether López Aliaga's second-place position holds as final counting concludes — he is currently the main challenger to Fujimori for the runoff spot.
  • Whether any electoral authority challenge or fraud allegation (López Aliaga has already raised fraud claims) could invalidate results and trigger a recount affecting runoff composition.
  • The exact identity and vote share of Jorge Nieto in the actual election results — it's possible he received a small number of votes with no path to second place.
Market Context
Price: 0.05 · 7d: +0.01 · 30d: +0.01
Volume: HIGH — 9,307 avg daily contracts is substantial for a niche matchup market · Depth: LOW — only 4 data points, price range 3-20% over its lifetime
Reliability: MEDIUM-HIGH — the market price at 5% aligns well with emerging election results showing Fujimori-López Aliaga as the likely runoff; the López Aliaga second-place market at 65% provides strong corroborating arbitrage evidence against the Nieto scenario
4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price
Independent estimate: 1% (96% confidence)
base rate
1%
96% conf
evidence driven
1%
97% conf
contrarian
2%
95% conf
Spread
1pp
Low disagreement
sq1: Will Keiko Fujimori qualify as a nominee/advance to the second round in the 2026 Peru presidential election?
92%
Base rate: Keiko has advanced to the runoff in 2 of her 3 previous presidential runs (2011, 2016, 2021 — she advanced in 2016 and 2021). That's a ~67% base rate. Evidence updates: She is currently leading the first round with ~16.88% with 62% of ballots counted, ahead of all other candidates. In a 35-candidate field, this lead is substantial. This pushes probability strongly UP from base rate. The only downside risks are: (1) a legal disqualification attempt (no evidence of this), or (2) a dramatic shift in the remaining 38% of ballots (extremely unlikely to overtake a clear leader). Final estimate: ~92%.
sq2: Will Jorge Nieto qualify as a nominee/advance to the second round in the 2026 Peru presidential election?
1%
Base rate: In a 35-candidate field, the prior probability of any specific non-frontrunner advancing is roughly 2/35 ≈ 5.7%. But evidence strongly pushes DOWN: Jorge Nieto is not mentioned among the leading candidates in any exit poll or partial count. With 62% of ballots counted, the top two are Fujimori (~16.88%) and López Aliaga (~13.88%). Other named candidates like Sánchez (~12.1%) and Belmont (~11.8%) are ahead but still behind López Aliaga. Nieto appears to be far behind — likely in single digits or lower. For him to leap from an unmentioned position to second place with only 38% of ballots remaining would require an extraordinary and unprecedented shift. This pushes probability down to approximately 1%.
sq3: Will BOTH Keiko Fujimori AND Jorge Nieto simultaneously advance (making this the exact runoff matchup)?
1%
This is the conjunction of sq1 and sq2. P(both advance) = P(Keiko advances) × P(Nieto advances | Keiko advances). Given Keiko is very likely to advance (~92%) but Nieto is essentially not in contention (~1%), the joint probability is approximately 0.92 × 0.01 ≈ 0.009. The partial count data strongly contradicts this matchup — the emerging runoff is Fujimori vs. López Aliaga. Rounding up slightly for residual uncertainty about uncounted ballots or extraordinary events: ~1%.
Show full reasoning trace
base rate: In a 35-candidate field, the probability of any specific two-candidate matchup advancing to a runoff is very low a priori — roughly (2/35) × (1/34) adjusted for candidate strength, which gives maybe 5-15% for plausible matchups. For a matchup involving one frontrunner (Keiko) and one non-frontrunner (Nieto), the base rate might be ~3-5%.
evidence updates: The critical evidence is the actual first-round vote count (62% tallied): Fujimori leads at ~16.88%, López Aliaga is second at ~13.88%, and Nieto is not among the named leading candidates. This is overwhelming evidence against the Fujimori-Nieto matchup. The probability drops from the ~5% base rate to approximately 1%. The remaining 38% of ballots would need to produce an unprecedented shift to elevate Nieto from an unmentioned position to second place.
combination method: The question resolves YES only if both Keiko and Nieto advance. This is a conjunction — effectively sq3. While the weighted average formula gives 0.374, the actual resolution condition maps directly to sq3 (the conjunction). I use sq3's probability of 0.01 as the final answer.
final: With 62% of Peru's first-round ballots counted, the runoff is shaping up as Fujimori vs. López Aliaga. Jorge Nieto is not among the named contenders and has no realistic path to second place. The probability of a Fujimori-Nieto runoff is approximately 1%.
ensemble: {'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.01, 'confidence': 0.96}, 'evidence_driven': {'p_yes': 0.01, 'confidence': 0.97}, 'contrarian': {'p_yes': 0.02, 'confidence': 0.95}}, 'spread': 0.01, 'individual_p_yes': {'base_rate': 0.01, 'evidence_driven': 0.01, 'contrarian': 0.02}}
5. Devil's Advocate Sonnet · legacy v2 Market price revealed
Missing Info Time Awareness Issue Asymmetric Evidence
Challenges
  1. The forecaster states Jorge Nieto is 'not among the named leading candidates' but acknowledges a key information gap: his actual vote share is unknown. With 38% of ballots still uncounted and 35 candidates, there's a non-trivial possibility Nieto could be in 3rd-5th place and not specifically named in the summary data the forecaster accessed. The forecaster may be treating 'not mentioned in my sources' as equivalent to 'has negligible vote share,' which is an inference gap.
  2. The forecaster assigns only 1% to Nieto advancing, but the question resolves based on the final runoff matchup, not just first-round results. If there are legal disqualifications, candidate withdrawals, or other procedural events between now and the second round (362 days to resolution!), the matchup could change. The forecaster doesn't adequately account for the long resolution window.
  3. The resolution date is April 12, 2027 — a full year away. The question asks about 'nominees' which could encompass scenarios beyond just first-round advancement. If the second-place finisher is disqualified or withdraws before the runoff, could Nieto advance as a replacement? The forecaster doesn't consider this pathway at all.
  4. With 62% of ballots counted, the margin between López Aliaga (~13.88%) and the 3rd/4th place candidates (~12.1% and ~11.8%) is only about 1-2 percentage points. If Nieto is in 5th-6th place at, say, 8-10%, the remaining 38% of ballots could theoretically close gaps — though probably not enough to overtake López Aliaga. The forecaster doesn't quantify where Nieto actually stands, making the 1% estimate feel like it's based on absence of evidence rather than evidence of absence.
  5. The Kalshi market prices this at 5%, and the market for López Aliaga finishing second is at 65% (not 95-99%). This implies the market assigns roughly 35% probability that someone OTHER than López Aliaga finishes second. The forecaster's 1% for Nieto seems potentially too low given this remaining uncertainty, even if Nieto is a long shot among the non-López Aliaga possibilities.
Suggested adjustment: +2pp
The forecaster's core reasoning is sound — Nieto is very unlikely to advance given partial results. However, three genuine reasoning issues warrant a small upward adjustment: (1) the absence of Nieto's actual vote share means the 1% estimate is based on inference from missing data rather than confirmed low performance; (2) the 362-day resolution window introduces non-trivial probability of disqualifications, withdrawals, or procedural changes that could alter the runoff matchup; (3) the López Aliaga second-place market at 65% (not 95%+) implies meaningful residual uncertainty about who finishes second. Adjusting from 1.3% to approximately 3% better reflects these uncertainties while still recognizing that Nieto is a very unlikely runoff participant.
Market comparison: Forecaster: 1.3%, Market: 5.0%. The 3.7% divergence is notable. The market may be slightly inflated by illiquidity (only 4 orderbook data points) and the possibility that some traders are accounting for disqualification/withdrawal scenarios over the 362-day resolution window that the forecaster doesn't model. However, the forecaster's core evidence is strong — partial counts clearly show Fujimori vs. López Aliaga as the emerging matchup. A modest upward adjustment to ~3% is warranted by genuine reasoning gaps, not market conformity pressure.
6. Aggregator Opus · final calibrated forecast
3% (82% confidence)
With 62% of Peru's first-round ballots counted, Fujimori leads at ~16.88% and López Aliaga is second at ~13.88%, with Nieto not among named contenders. The Devil's Advocate correctly identified that (1) Nieto's exact vote share is unknown (inference from absence), (2) the 362-day resolution window introduces disqualification/withdrawal scenarios, and (3) the López Aliaga second-place market at 65% implies ~35% chance someone else finishes second. These pushed my estimate from 1.3% to 3%. I remain below the market's 5% because the orderbook depth is very low (4 data points), the partial count evidence is strong against Nieto, and even distributing the residual uncertainty generously gives Nieto only ~1-2% of the non-López Aliaga scenarios multiplied by Keiko's ~92% advancement probability.