Scan: Will Renan Santos win 8% or more of the valid vote in the first round of the 2026 Brazilian presidential election?

1. Planner Fable 5.1 · Fermi decomposition + tool plan

Tools chosen: polymarket_direct polymarket_related kalshi_related article_search gdelt_news claude_news wikipedia code_execution resolution_source

Sub-questions (Fermi decomposition)

What is Renan Santos's current vote share in recent 2026 Brazilian presidential polls (Datafolha, Quaest, AtlasIntel, Paraná Pesquisas), and what is the trend?
Is Renan Santos's party (Missão / MBL) officially registered with the TSE and will he be a confirmed, registered candidate on the first-round ballot by August 2026?
Who are the other major candidates (Lula, Tarcísio de Freitas, Flávio/Michelle Bolsonaro, Ratinho Jr., Ronaldo Caiado, Romeu Zema) and does the right-wing field consolidate in a way that leaves room for an outsider at 8%+?
What is the historical base rate for third-tier or outsider candidates in Brazilian presidential first rounds (1989–2022) to reach 8% or more of valid votes, and how far below 8% were candidates polling at similar levels a year out?
How is the Polymarket vote-share bracket distribution for Renan Santos priced, and what do other Brazil 2026 election markets (Polymarket winner market, Kalshi) imply about his viability?
Are there any signals of a surge (media attention, debate access, alliance with a larger party, endorsements) that could lift Santos from ~1-3% toward 8%?

Planner reasoning

Renan Santos (MBL leader, Missão party) is a fringe/outsider candidate in Brazil's 2026 presidential race; the key drivers are his current polling level (historically low single digits), whether his party is even registered and he makes the ballot, how many major candidates split the right-wing/anti-Lula vote, and the historical base rate of outsider candidates reaching 8% in Brazilian first rounds. The Polymarket price is the primary anchor, with sibling bracket markets and Kalshi Brazil markets for triangulation.

2. Research Parallel tool calls

tool	status	time	items	summary
polymarket_direct	OK	0.3s	1	## This Market's Polymarket Data Will Renan Santos win 8% or more of the valid vote in the first round of the 2026 Brazilian presidential election? - Current price (probability): 7.50% - 7-day price change: -15.00% - 30-day price change: -15.00% - Total volume: $55,828 (USD notional) - Price ra
polymarket_related	OK	0.8s	24	Polymarket search over 3 keyword(s), kept 24 matches. keyword 'Renan Santos': 8 markets \| keyword 'Brazil presidential election': 8 markets \| keyword 'Brazilian presidential election first round': 8 markets
kalshi_related	OK	9.8s	2	2 related markets / summaries. keyword 'Brazil president': ok \| keyword 'Brazilian election': ok \| keyword 'Lula': no matches
article_search	OK	46.9s	18	Fetched 18 unique articles across 3 queries (lookback=60d). 'Renan Santos presidential poll 2026 Brazil': 10 articles \| 'Renan Santos MBL Missão party candidacy': 10 articles \| 'Brazil 2026 presidential election poll Datafolha Quaest Lula Tarcísio Flávio Bolsonaro': 10 articles
gdelt_news	OK	60.7s	30	GDELT: 30 articles across 3 queries (lookback=45d). 'Renan Santos pesquisa presidente 2026': 10 hits \| 'Renan Santos MBL Missão candidatura': 10 hits \| 'pesquisa eleitoral presidente 2026 Datafolha Quaest': 10 hits
claude_news	OK	25.2s	17	Based on research: - Candidacy confirmed & TSE registration complete: The Mission Party (Partido Missão) had its TSE registration approved in November 2025 with party number 14, and the Mission party officially confirmed Renan Santos's presidential candidacy at a convention on August 1, 2026,
wikipedia	OK	0.7s	4	Fetched 4 Wikipedia entries (0 missing pages).
code_execution	OK	35.3s	0	Base rate analysis (Brazilian presidential first rounds, 1989–2022): - Among historical candidates polling ≤3% roughly a year out who went on to become the "third force" (Ciro Gomes ×4, Marina Silva ×2, Garotinho, Heloísa Helena, Amoêdo, Tebet, Collor-89), 7 of 12 (≈58%) eventually cleared
resolution_source	OK	3.5s	1	already_resolved=no; matches_criteria=True; last_updated=unknown. The fetched page is the TSE Open Data Portal homepage, showing dataset categories (e.g., Candidatos - 2026, Eleitorado - 2026, Processual - 2026) but no actual vote count or candidate results data for the 2026 election, as the electio

3. Evidence Brief Sonnet 5 · 7067 chars

# Current state Renan Santos is a confirmed, TSE-registered candidate (Partido Missão, registered Nov. 2025; candidacy formalized Aug. 1, 2026) running third-tier in first-round polling (roughly 3-8% across pollsters, no sustained trend above 8%). The market resolves on his official first-round vote share on Oct. 4, 2026; a recent TSE campaign suspension (Sept. 2026) and a subsequent court reversal add legal uncertainty but do not currently threaten his ballot status. # Timeline of key events - 2025-11: Partido Missão officially registered with TSE, eligible for 2026 election (confirmed — Wikipedia/Free Brazil Movement). - 2026-07 (mid): AtlasIntel/Bloomberg poll shows Santos at 7.8% first-round intent, leading among 16-24-year-olds at 38% (reported — claude_news). - 2026-07-25: Flávio Bolsonaro formalized as PL presidential candidate, consolidating much of the mainstream right (confirmed — CNBC). - 2026-08-01: Missão convention confirms Renan Santos as presidential candidate with VP Aroldo Medina; 51-page platform filed (confirmed — Brasil de Fato, Wikipedia). - 2026-08 (throughout): BTG/Nexus and Quaest polls put Santos at ~4% (tied with Caiado); Datafolha keeps him near 3% (reported — claude_news, Wikipedia poll page). - 2026-08-14: Flávio Bolsonaro's party faced last-minute registration complications two days before the deadline (reported — Mercopress). - 2026-09-01: TSE (Min. Dias Toffoli) suspends Missão's campaign — funds frozen, debate access barred, over social-media propaganda reporting failures (reported — Rio Times). - 2026-09-02/03: "Brazil Court Reverses Ban on Outsider Presidential Candidate" — likely reversal of the above suspension, restoring Santos's campaign activity, though exact scope unclear (reported — Breitbart). - 2026-09 (ongoing): Lula vs. Flávio Bolsonaro dominate horse-race coverage (Lula ~38-42%, Flávio ~26-30%), with Santos absent from top-line runoff narratives (reported — multiple Rio Times/Datafolha/Quaest articles). # Event Will Renan Santos (Partido Missão) receive ≥8% of valid votes in the first round of the 2026 Brazilian presidential election (Oct. 4, 2026)? # Outcomes to forecast Yes / No (8%+ threshold on his own vote-share bracket ladder) # Kalshi market anchor No direct kalshi_direct price was returned in this pull; the closest Kalshi proxy, "Who will advance — Renan Santos" (KXBRPRESADVANCE-26OCT04-RSAN), trades at **2%** (down 47% over 30 days, down 5% over 7 days), implying very low odds he even reaches the runoff, let alone 8%+ in round one. Polymarket's own 8%+ bracket market for this exact question prices **YES at 7.5%**, down sharply from a 30-day high of 22.5% (−15pp in both 7d and 30d windows), on $55.8K volume — a clear downtrend. # Resolution source TSE Open Data Portal (dadosabertos.tse.jus.br) homepage fetched; shows only dataset category listings (Candidatos-2026, Eleitorado-2026, Processual-2026), no vote results yet since the election hasn't occurred. Not yet resolved; matches the specified resolution source. # Sub-question answers 1. **Polling trend**: Ranges 3%-7.8% across 2025-26 polls: Datafolha ~3%, BTG/Nexus & Quaest (Aug 2026) ~4%, AtlasIntel/Bloomberg (Jul 2026) 7.8% — no sustained convergence above 8% [claude_news, Wikipedia polling page]. 2. **Registration**: Yes — Missão registered with TSE Nov. 2025; Santos formally nominated candidate Aug. 1, 2026, with VP and platform filed [Wikipedia, Brasil de Fato]. 3. **Field consolidation**: Right largely consolidating around Flávio Bolsonaro (PL, ~26-30% vs Lula ~38-42%); Jair Bolsonaro ineligible (imprisoned). Tarcísio, Ratinho Jr., Caiado polling single digits or not running as frontline candidates, leaving limited but nonzero outsider space [CNBC, riotimesonline, claude_news]. 4. **Historical base rate**: Established politicians who polled low ~1yr out (Ciro, Marina, Garotinho) hit 8%+ ~58% of time (survivorship-biased); but fringe/activist candidates (Amoêdo 2018, d'Ávila 2022) plateaued at 2-5%. Lognormal noise model gives <1% chance from 1% baseline, 5-11% from 3% baseline [code_execution]. 5. **Market pricing**: Polymarket 8%+ bracket = 7.5% (falling); 6-8% bracket = 5.5%; 4-6% = 26%; 2-4% = 46.5%; <2% = 15.5% — distribution centers on 2-6% range. Kalshi advance-market at 2% [polymarket_related, kalshi_related]. 6. **Surge signals**: Strong youth appeal (38% among 16-24) and low personal rejection (27% vs. 49% for frontrunners) suggest upside potential, but TSE campaign suspension (Sept. 2026, later apparently reversed) is a headwind/uncertainty [claude_news, gdelt_news]. # Key facts (high-confidence, factual) 1. [Wikipedia] Missão registered Nov. 2025; Santos nominated Aug. 1, 2026. 2. [claude_news] Poll range 3%-7.8%, no consistent 8%+ reading. 3. [gdelt_news/Rio Times] TSE suspended Missão's campaign ~Sept. 1, 2026 (funds frozen, debates barred); apparent court reversal reported Sept. 2-3. 4. [Polymarket] 8%+ bracket priced at 7.5%, down from 22.5% high in past 30 days. 5. [Kalshi] Advance-to-runoff market for Santos at 2%, down 47% over 30 days. # Cross-market signals - Kalshi related: Advance market 2% (down sharply) — bearish signal on overall viability. - Polymarket: 8%+ bracket 7.5% (falling); most probability mass (46.5%) in the 2-4% bracket, consistent with recent Quaest/BTG polling. - Sportsbook implied: N/A (no betting market data). # Analyst opinions and speculation - Missão's internal strategy bets on a "chaos scenario" from Bolsonaro's ineligibility to open space for an outsider, per apublica.org reporting — a bullish narrative not yet borne out in polling. - Second-round simulations show Santos hypothetically reaching 34% vs. Lula, suggesting latent demand, but this is not indicative of first-round breakout given current fragmented positioning [claude_news]. # Directional lean per outcome - **Yes (≥8%)**: Supported by one outlier Atlas/Bloomberg poll (7.8%), youth enthusiasm, low rejection rate; opposed by declining Polymarket/Kalshi pricing, most polls at 3-4%, TSE legal troubles, and consolidation of right around Flávio. - **No (<8%)**: Supported by majority of recent polls (3-4%), falling market prices across both Kalshi and Polymarket, historical base rate for fringe/activist candidates plateauing below 8%. # Gaps / unknowns - No direct kalshi_direct YES price returned for this specific ticker (only proxy "advance" market available). - Unclear final resolution/impact of the TSE suspension and its reported reversal on Santos's campaign resources/debate access going into October. - No September/October Datafolha or Quaest first-round numbers included in this research pull — most recent explicit Santos number is Aug. 2026 (~4%). # Calibration anchors - Polymarket 8%+ bracket YES price: **7.5%** (downtrend, primary comparable anchor). - Kalshi "advance" proxy market: **2%** (downtrend). - Historical base rate: fringe/activist first-time candidates rarely exceed 5-6% (Amoêdo 2018 ~2.5%, d'Ávila 2022 ~0.5%); established-politician outsiders sometimes exceed 8% but Santos lacks that profile.

4. Forecasters 5 draws · Fable 5.1 + GPT-5.6 Sol

claude-fable-5-1

58% conf

Yes	7%
No	93%

Most recent polling (Aug 2026 Quaest, BTG/Nexus, Datafolha) places Renan Santos at 3-4%, with only a single July AtlasIntel outlier at 7.8% and no sustained readings at or above 8%. The closest direct anchor, Polymarket's 8%+ bracket, trades at 7.5% and has fallen from 22.5% over 30 days, while Kalshi's advance-to-runoff proxy sits at 2% and is also declining; Polymarket's mass is concentrated in the 2-6% range. The right has consolidated around Flávio Bolsonaro, the historical base rate for fringe/activist first-time candidates (Amoêdo, d'Ávila) is a 0.5-5% plateau, and the September TSE campaign suspension (even if reversed) cost resources and debate access. Youth appeal and low rejection provide some tail upside, so I stay near the Polymarket anchor rather than below it.

claude-fable-5-1

62% conf

Yes	7%
No	93%

Most recent polling (Aug 2026 Quaest/BTG ~4%, Datafolha ~3%) places Santos well below the 8% threshold, with only a single July AtlasIntel outlier at 7.8%; the Polymarket 8%+ bracket for this exact question trades at 7.5% and has fallen from 22.5% over 30 days, while the Kalshi advance proxy sits at 2%. The right is consolidating around Flávio Bolsonaro, and the September TSE campaign suspension (even if reversed) disrupted funding and debate access at a critical time. Historically, fringe/activist first-time candidates in Brazil (Amoêdo, d'Ávila) plateaued at 2-5%, and late strategic consolidation toward frontrunners typically shrinks minor-candidate shares further. Youth enthusiasm and low rejection offer some tail upside, so I hold Yes near the market's 7.5% rather than lower.

claude-fable-5-1

58% conf

Yes	8%
No	92%

Most recent polling (Aug 2026 Quaest, BTG/Nexus ~4%, Datafolha ~3%) places Santos well below the 8% threshold, with only a single July AtlasIntel outlier at 7.8%. The closest market anchors agree: Polymarket's identical 8%+ bracket is priced at 7.5% and falling from a 22.5% high, while Kalshi's advance-to-runoff proxy sits at 2%; Polymarket's mass is concentrated in the 2-6% brackets. The right is consolidating around Flávio Bolsonaro and the September TSE suspension (even if reversed) disrupted campaign resources and debate access, while historical fringe/activist candidates (Amoêdo, d'Ávila) plateaued at 2-5%. Youth enthusiasm and low rejection offer some tail upside, so I stay near the Polymarket anchor rather than going below 5%.

gpt-5.6-sol

74% conf

Yes	8%
No	92%

Recent Datafolha, Quaest, and BTG/Nexus polling centers Santos around 3-4%, pointing to No because he would need a substantial late surge to reach 8%. The bullish evidence—one 7.8% AtlasIntel result, strong youth support, and low rejection—shows a plausible path but has not produced a sustained polling trend. Right-wing consolidation around Flávio Bolsonaro and Santos's recent campaign suspension controversy further constrain his upside, while his confirmed registration keeps ballot-access risk low. With no direct Kalshi price, I anchor on Polymarket's exact-market 7.5% YES price, corroborated directionally by Kalshi's bearish 2% runoff-advancement proxy.

gpt-5.6-sol

74% conf

Yes	8%
No	92%

Recent Datafolha, Quaest, and BTG/Nexus polling centers Santos around 3-4%, pointing toward No because he would need a substantial late surge to reach 8%. The 7.8% AtlasIntel result, strong youth support, and low rejection provide a plausible upside path, but this has not been sustained across pollsters. Right-wing consolidation around Flávio Bolsonaro and Santos's campaign-related legal disruption further favor No, while his confirmed registration means ballot access itself is not the main risk. With no direct Kalshi price, I anchor primarily on Polymarket's exact-market 7.5% YES price and place modestly more weight on the upside signals, yielding 8%.

6. Final plain mean of 5 draws

8% (65% confidence)

Yes: 8% No: 92%

Mean of 5 draws (0.07, 0.07, 0.08, 0.07, 0.08). Most recent polling (Aug 2026 Quaest, BTG/Nexus, Datafolha) places Renan Santos at 3-4%, with only a single July AtlasIntel outlier at 7.8% and no sustained readings at or above 8%. The closest direct anchor, Polymarket's 8%+ bracket, trades at 7.5% and has fallen from 22.5% over 30 days, while Kalshi's advance-to-runoff proxy sits at 2% and is also declining; Polymarket's mass is concentrated in the 2-6% range. The right has consolidated around Flávio Bolsonaro, the historical base rate for fringe/activist first-time candidates (Amoêdo, d'Ávila) is a 0.5-5% plateau, and the September TSE campaign suspension (even if reversed) cost resources and debate access. Youth appeal and low rejection provide some tail upside, so I stay near the Polymarket anchor rather than below it.

Pipeline Timing

Total pipeline time: 142.8s

Per-tool research timings shown in the Research section above.