Flávio Bolsonaro finishes in second place in the first round of the 2026 Brazilian presidential election.
The first round is scheduled for October 4, 2026; resolves if official tallies show Bolsonaro receiving the second-highest count of valid votes.
Across 6 frontier models answering independently, the panel has all but ruled it out: the median is 14%.
They do not agree: Qwen puts it at 38% and GPT at 3%, 35 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 70%, so the models are 56 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
- -56 pts
- Moved this week
- -2 pts
- Volume
- $1.4M
The models are sharply less confident than traders risking real money: 14% against 70%.
What each one said
-
QwenAlibaba
Flávio's path to second depends on whether he consolidates the Bolsonaro base or if another right-wing candidate splits it.
- Lula leads most polls; the fight for second is between Flávio, Tarcísio de Freitas, and possibly Michelle Bolsonaro or another right figure.
- Flávio carries the Bolsonaro surname but lacks his father's charisma and faces Tarcísio's stronger governor track record in São Paulo.
- If Tarcísio or another right-wing candidate outperforms Flávio in consolidating anti-Lula votes, Flávio drops to third or lower.
38% -
GrokxAI
Final 3-day polls and TSE ballot order, not family name, decide second place.
- Lula is the prohibitive first-round leader; the right’s vote is split among Tarcísio, Caiado and Flávio, none of whom has locked second.
- Flávio’s Senate record and late entry put him well below the 18-22 % needed to finish runner-up in every 2022-style simulation.
- A last-minute Tarcísio collapse or Bolsonaro-family consolidation would be the only development that could still lift him.
18% -
ClaudeAnthropic
Depends on whether Flávio consolidates the Bolsonarista base as the right's standard-bearer by election day.
- Flávio has not been the clear right-wing frontrunner in most 2026 polling; Tarcísio de Freitas or others have often led that camp.
- With Jair Bolsonaro ineligible, the right's vote could fragment or coalesce around a different figure, reducing Flávio's odds of outright second place.
- If Flávio becomes the sole consolidated anti-Lula candidate with strong polling by October 2026, this probability would rise sharply.
15% -
DeepSeekDeepSeek
Flávio Bolsonaro's second-place odds hinge on whether he clears the runoff field behind Lula, and polling has him trailing multiple rivals.
- Lula is the near-certain first-round leader; the real contest is for second among Flávio, Tarcísio, Ratinho, and Zema.
- Flávio has polled in the low-to-mid teens nationally, typically behind at least one governor-turned-candidate in head-to-heads.
- His father's ineligibility and legal exposure cap his ceiling, while the center-right field is fragmented enough to split the anti-Lula vote.
12% -
GeminiGoogle
Flávio Bolsonaro is far behind other right-wing standard-bearers like Tarcísio de Freitas to claim the conservative mantle.
- Jair Bolsonaro's ineligibility leaves governors Tarcísio, Zema, and Ratinho Jr positioned well ahead of Flávio in PL succession plans.
- Flávio lacks independent nationwide electoral appeal and would need prominent governors to decline runs while securing his father's blessing.
- Polls show Lula leading and Tarcísio capturing the bulk of anti-PT votes; Flávio entering the race as the top challenger is very improbable.
4% -
GPTOpenAI
It turns on whether Flávio Bolsonaro is the right’s official nominee rather than a substitute for Jair Bolsonaro or another ally.
- Brazil’s major parties must settle tickets before the August 2026 registration deadline; Flávio lacks Jair’s established national vote base.
- In open Brazilian presidential races, a viable right-wing standard-bearer often reaches a runoff, but family succession is not automatic.
- A definitive Jair Bolsonaro disqualification plus unified endorsements from PL and allied governors would sharply raise the chance.
3%
6 of 6 models answered · 35 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 second-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 second-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 1 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.