Renan Santos finishes in third place in the first round of the 2026 Brazilian presidential election.
Brazil's general election first round is set for October 4, 2026. Resolves based on official valid vote tallies placing Santos third.
Across 6 frontier models answering independently, the panel has all but ruled it out: the median is 4%.
They do not agree: Qwen puts it at 71% and Gemini at 2%, 69 points apart. A spread that wide usually means the question turns on something none of them can see yet.
Money disagrees. The market sits at 54%, so the models are 50 points less confident than people with cash on the outcome — one of the wider gaps in the archive.
Nothing is settled until 5 Oct 2026, when the outcome is checked against sources and every number above gets a permanent score.
- AI edge
- -50 pts
- Moved this week
- +10 pts
- Volume
- $581K
The models are sharply less confident than traders risking real money: 4% against 54%.
What each one said
-
QwenAlibaba
Santos is polling solidly third behind Lula and Tarcísio, with a wide gap to fourth-place candidates.
- Latest Datafolha and Quaest polls from late September 2026 consistently place Santos at 12-16%, well ahead of fourth-place candidates at 3-6%.
- The gap between third and fourth is large enough that a two-day swing is implausible barring a major scandal or event.
- Santos (MBR founder, anti-establishment right) has consolidated a niche that no other candidate has seriously contested since mid-2026.
71% -
GrokxAI
Last 48h polls and TSE valid-vote ranking after Oct 4 first round.
- TSE must certify tallies by 5 Oct; Santos currently trails Lula/Tarcísio and at least one other (Haddad or Bolsonaro-aligned) in late Sept Datafolha/Ipec.
- Outsiders historically take 3rd ~once per three cycles (Ciro 12% 2018); Santos’s MBL base sits well below that threshold.
- A final-debate collapse by the current 3rd-place name would be the only realistic mover.
9% -
ClaudeAnthropic
Santos is a minor far-right figure far behind Lula and the leading right-wing contender in polling.
- Polls through 2026 consistently show Santos well outside the top three, typically single digits or less.
- Third place is likely contested by established figures like Tarcísio, Ratinho Jr, or similar heavyweight candidates.
- Only a late-breaking surge with major coalition consolidation behind Santos would change this, which hasn't materialized.
4% -
GPTOpenAI
Santos needs to overtake several established national contenders in a field usually dominated by major-party tickets.
- On October 4, voters—not party officials—decide; official TSE tallies should be available within hours or days.
- Brazilian presidential third places have typically gone to nationally known politicians with party machines, TV exposure, and funding.
- I would raise this sharply only if late polling before voting showed Santos consistently ahead of other non-leading candidates.
3% -
DeepSeekDeepSeek
Santos is a minor Novo party figure polling far outside third; only a mass elite collapse puts him there.
- Lula and Tarcísio/Flávio Bolsonaro dominate the top tier; third place is contested by several governors polling double digits, not Santos.
- Brazil's 2026 race has a fragmented centre-right field, but Novo's candidate has never polled near third in any major survey.
- The one shift that would matter: a major candidate's disqualification or withdrawal days before October 4 reshuffling the field, which is too late to lift a…
3% -
GeminiGoogle
Santos lacks the party apparatus, ballot status, or polling share needed to overtake established third-way candidates.
- His MBL-derived party project Missao lacks the national registration and state machinery required to field a top-tier run.
- Brazilian third-place finishers historically require 4% to 20% of valid votes, an unreachable bar given his near-zero polling.
- A massive, sudden collapse of center-right alternatives like Tarcisio, Caiado, or Zema would be required to create an opening.
2%
6 of 6 models answered · 69 points between the highest and lowest. None was shown the market price.
Resolution criteria
A presidential election is scheduled to take place in Brazil on October 4, 2026. This market will resolve according to the listed candidate who receives the third-most valid votes in the first round of this election. The named candidates will be primarily ranked by the number of valid votes received in the specified election. If two or more candidates are tied on valid votes, ties will be broken by alphabetical order of the candidates' last names. This market will resolve to the candidate that occupies the third-highest finishing position after applying this ranking. If the result of this election isn't known definitively by June 30, 2027, 11:59 PM ET, the market will resolve to "Other". This market will resolve based on the result of the election, as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the Brazilian government, specifically the Superior Electoral Court (Tribunal Superior Eleitoral, TSE) (e.g., https://dadosabertos.tse.jus.br/).
Question sourced from Polymarket on 2 Oct 2026. Forecast by google/gemini-3.8-flash, anthropic/claude-sonnet-5, openai/gpt-5.6-terra, x-ai/grok-4.6, deepseek/deepseek-v4.1-flash, qwen/qwen3.8-max-0902 via OpenRouter.