🏛️ Politics · Next Month

Brazil presidential election (October 4, 2026): No candidate reaches an outright majority in round one—runoff on October 25 between Lula (PT) and Flávio Bolsonaro (PL) confirmed

Hit ✦ AI-generated prediction Published on 3. September 2026 · Predicted for 4. October 2026 · Based on: Historical Cycle

Probability

81%

Lula (PT) faces Senator Flávio Bolsonaro (PL) and others (Boulos, Gomes) on October 4. Lula is expected to get >43% (existing Cassandra prediction) but not >50%. In a polarized multi-candidate field, a first-round majority requires unprecedented dominance—every Brazilian presidential election since 2002 has gone to a runoff. Metaculus/Polymarket: no specific runoff market found. Own estimate: 81% based on electoral law, polling logic, and historical pattern.

Data basis for this prediction

Brazil 2026 Elections: R1 am 4. Oktober, Stichwahl 25. Oktober (AS-COA as-coa.org, Nov. 2025)
Kandidaten 2026: Lula vs. Flávio Bolsonaro + weitere (IFRI / Wikipedia: 2026 Brazilian election)
Bestehende Cassandra-Prognose: Lula > 43 % in Runde 1 (impliziert kein 50 %+)
Historisches Muster: jede Wahl seit 2002 → Stichwahl (TSE-Daten)

Verdict: Hit

Die Vorhersage ist vollständig eingetreten. Im ersten Wahlgang am 4. Oktober 2026 erreichte kein Kandidat die absolute Mehrheit: Flávio Bolsonaro (PL) kam mit 47,03 % auf Platz 1, Lula (PT) mit 45,16 % auf Platz 2. Die prognostizierte Stichwahl am 25. Oktober 2026 zwischen genau diesen beiden Kandidaten findet statt. Lulas Erstrundenanteil von 45,16 % liegt zudem im vorhergesagten Korridor (>43 %, <50 %). Quellen: CNN (cnn.com/2026/10/04/americas/brazil-president-elections-2026-latam-intl), Wikipedia EN (2026 Brazilian general election), Wikipedia PT (Eleição presidencial no Brasil em 2026), Exame Live-Blog (exame.com/live-blog/brasil/eleicoes-2026-apuracao-resultado-ao-vivo/). Einzige nicht explizit vorhergesagte Abweichung: Flávio Bolsonaro gewann den ersten Wahlgang knapp vor Lula – die Vorhersage implizierte Lula als Erstplatzierten, was aber kein Kernbestandteil der Prognose war.

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