The Republican nominee wins the Ohio U.S. Senate race in 2026.
Ohio holds a U.S. Senate election in November 2026. The market resolves Yes if the Republican party nominee wins the race or subsequent run-offs.
Across 6 frontier models answering independently, the panel leans yes: the median is 77%.
They broadly agree, 16 points between DeepSeek at 88% and Qwen at 72%.
Money disagrees. The market sits at 42%, so the models are 35 points more 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
- +35 pts
- Moved this week
- +4 pts
- Volume
- $418K
The models are sharply more confident than traders risking real money: 77% against 42%.
What each one said
-
DeepSeekDeepSeek
Ohio's red tilt plus Sherrod Brown's absence makes a GOP hold the strong default in this special election.
- Ohio has voted Republican in every statewide federal race since 2016, and Trump carried it by 11 in 2024, so the GOP starts well above a 50-50 baseline.
- The 2026 race is a special election for the seat JD Vance vacated; Republican Gov. DeWine appointed Jon Husted, giving the GOP an incumbent with a full year of…
- Democrats' best hope was Sherrod Brown, who has already said he is not running; without him the party lacks a proven statewide vote-getter in a state it has not won…
88% -
ClaudeAnthropic
Ohio has trended solidly red statewide; GOP nominee (likely incumbent Husted) is heavily favored over Democratic challenger.
- Ohio shifted strongly Republican since 2016, with Trump winning it by double digits in 2024 and GOP sweeping recent statewide races.
- Incumbent Republican appointee enjoys fundraising and infrastructure advantages typical of incumbency plus favorable partisan lean in a midterm under a Democratic…
- Main risk is a surprise Democratic wave or weak/scandal-hit GOP nominee, which would be the main thing to change this estimate.
80% -
GrokxAI
Ohio's structural R lean in a Vance-seat special with one month left.
- DeWine appointed an R; the nominee (likely Moreno-class) starts with Trump+11 and Vance+6 maps.
- Ds have not posted an 8-pt swing here since 2018; 2024 Brown loss and 2022 results set the floor.
- Only a late nominee scandal or R turnout collapse would reverse it this close to Nov 3.
78% -
GPTOpenAI
Ohio’s durable Republican lean and a near-election incumbent-party advantage make the GOP nominee the clear favorite.
- Ohio voted Republican by about 8 points in the 2022 Senate race and has not elected a Democrat statewide since 2018.
- The nominee must still avoid a late scandal or turnout collapse before November 3; third-party candidates rarely win Senate races.
- I would cut this sharply if credible October polling showed the Democrat ahead by 3+ points or a major GOP nominee withdrawal.
76% -
GeminiGoogle
Ohio has shifted firmly red, giving the Republican nominee a solid structural baseline in a mid-decade federal race.
- Trump carried Ohio by roughly 8 points in 2016, 2020, and expanded that margin in 2024, anchoring the statewide partisan tilt.
- Sherrod Brown lost in 2024, leaving Ohio Democrats without their strongest statewide federal vote-getter to mount a viable comeback.
- A massive national blue wave or a deeply flawed, scandal-plagued GOP nominee remains the only plausible path to a Democratic upset.
74% -
QwenAlibaba
Ohio's R+6 lean and Trump's 2024 margin make this a structural Republican advantage race.
- Ohio voted R+6 in 2024 and has trended Republican since 2016; no Democrat has won a statewide race there since 2012.
- The Republican nominee benefits from the state's partisan lean, which historically flips Senate races only under exceptional national wave conditions.
- A Democratic win would require a national environment significantly worse than current polling suggests for Republicans, or a uniquely weak GOP nominee.
72%
6 of 6 models answered · 16 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 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.