The Democratic nominee wins the Ohio US Senate special election in 2026.
Ohio is holding a Senate special election in November 2026. This resolves as true if the nominee on the official Democratic ticket secures the seat.
Across 6 frontier models answering independently, the panel thinks this is unlikely: the median is 17%.
They do not agree: GPT puts it at 41% and DeepSeek at 8%, 33 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 73%, 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 4 Nov 2026, when the outcome is checked against sources and every number above gets a permanent score.
- AI edge
- -56 pts
- Moved this week
- +4 pts
- Volume
- $1.3M
The models are sharply less confident than traders risking real money: 17% against 73%.
What each one said
-
GPTOpenAI
Ohio’s Republican lean is offset by a competitive special-election environment and any Democratic turnout edge.
- Ohio voted Republican in the 2024 Senate race and statewide federal contests, giving the GOP a meaningful baseline advantage.
- The official nominees, late polling, and turnout operations must convert support by the November 3 vote; no runoff is normally required.
- A credible final poll average showing either nominee ahead by 3+ points, especially in Hamilton and Cuyahoga turnout, would shift this most.
41% -
GeminiGoogle
Ohio's solid Republican baseline means a Democratic flip requires a major midterm backlash against a Trump-Vance administration.
- Ohio voted R+8 in 2020 and 2024, unseating Sherrod Brown; replacing Vance's appointee requires overcoming structural state tilt.
- A standard midterm penalty against the White House party offers Democrats their only real historical lever to close a 5-8 point gap.
- A damaged, unelectable GOP primary nominee would move this into toss-up range, but GOP institutional backing keeps them favored.
27% -
GrokxAI
Ohio's R+10 lean and late-Oct polling make a Dem Senate pickup in three days extremely unlikely.
- GOP nominee (appointed Vance successor or 2024 winner) starts with structural +8–12 edge that rarely evaporates in final 72 hours.
- Base rate: Dems 0-for-3 in Ohio Senate races since 2016; Brown's 2024 loss set the floor.
- Only a last-minute scandal or turnout collapse for GOP would move it; neither is visible now.
18% -
ClaudeAnthropic
Ohio has trended solidly Republican statewide, and incumbent GOP advantages in a special election make a Democratic win unlikely.
- Ohio has shifted red in recent cycles, with Trump winning it by ~8 points in 2020 and 2024 and Republicans holding both Senate seats since 2024.
- Special elections can see depressed turnout favoring the party with more enthusiasm, but statewide fundamentals still favor the GOP by a wide margin in Ohio.
- A major national Democratic wave, a scandal-plagued GOP nominee, or unusually weak Republican turnout would be needed to flip this outcome.
15% -
QwenAlibaba
Ohio's R+6-8 structural lean makes a Democratic flip nearly impossible even in a midterm wave.
- Ohio voted R+8 in 2024 and Democrats lost the open Senate seat by 6 points that same cycle, establishing a high floor for Republicans.
- Jon Husted holds incumbency, statewide name ID, and the GOP infrastructure advantage in a state where no Democrat has won statewide since 2018.
- A midterm wave would need to exceed 2022's overperformance by ~8 points in Ohio specifically—no modern precedent supports that magnitude of swing in this state.
9% -
DeepSeekDeepSeek
Ohio's red shift plus a GOP-appointed incumbent makes a Democratic win a long shot.
- Ohio has trended red hard: Trump won it by 8 in 2020 and 11 in 2024, and Republicans swept statewide offices in 2022 and 2024.
- The special election is for the seat JD Vance vacated; Gov. DeWine appointed Jon Husted, giving Republicans an incumbent with a fundraising and name-ID edge.
- Democrats' best case is a Sherrod Brown-style populist overperformance, but no comparable candidate has entered and the national environment would need a 2026 blue wave…
8%
6 of 6 models answered · 33 points between the highest and lowest. None was shown the market price.
Resolution criteria
This market will resolve according to the winner of the 2026 Ohio U.S. Senate special election currently scheduled for November 3, inclusive of any run-offs. A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date. Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party. The candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of the party. The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.
Question sourced from Polymarket on 31 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.