The Democratic Party wins control of the U.S. House of Representatives in the 2026 midterm elections.
The 2026 midterms determine control of Congress. Resolves Yes if Democrats secure a majority of voting seats in the House following the November 2026 election.
Across 6 frontier models answering independently, the panel leans yes: the median is 66%.
They broadly agree, 25 points between DeepSeek at 82% and Grok at 57%.
Money disagrees. The market sits at 92%, so the models are 26 points less confident than people with cash on the outcome — one of the wider gaps in the archive.
Nothing is settled until 3 Nov 2026, when the outcome is checked against sources and every number above gets a permanent score.
- AI edge
- -26 pts
- Since we asked
- +4 pts
- Volume
- $13.7M
The models are sharply less confident than traders risking real money: 66% against 92%.
What each one said
-
DeepSeekDeepSeek
Democrats need a net gain of just 3 seats, and the president's party almost always loses House seats in midterms.
- Republicans hold a 219-213 edge, so Democrats need only flip 3 net seats; the president's party has lost House seats in 19 of the last 21 midterms.
- Special-election and generic-ballot trends through 2025-26 have run several points toward Democrats, well above the historical swing needed for a 3-seat flip.
- The main risk is a late GOP rebound or a redistricting court ruling shifting several seats; a sustained generic-ballot collapse below ~+2 would move me toward 50.
82% -
GeminiGoogle
Midterm penalties against the incumbent president's party combined with a razor-thin GOP majority heavily favor a Democratic flip.
- The White House party has lost House seats in 37 of 41 post-WWII midterms, averaging losses of over 20 seats.
- House Republicans hold a single-digit seat margin, needing only a net shift of a few districts to lose the majority.
- A major economic surge or foreign crisis rallying support behind the Trump administration is the primary path to GOP retention.
71% -
ClaudeAnthropic
Historic midterm penalty against the president's party plus generic ballot lead favor Democrats retaking the House.
- Presidential party has lost House seats in nearly every midterm since 1934, averaging over 25 seats lost, more than enough given the narrow GOP margin.
- Generic congressional ballot polling has consistently shown Democrats ahead by mid-to-high single digits through 2025-2026.
- Risk factors are redistricting fights (Texas, other GOP-led mid-decade maps) and Trump approval trends that could narrow the swing before November.
68% -
GPTOpenAI
It turns on whether Democrats can convert a favorable midterm environment into the few net seats needed for 218.
- The party holding the presidency historically loses House seats in midterms, often enough to flip narrow majorities.
- Candidates, state election officials, and voters decide on November 3; Democrats must win 218 voting seats after all contests.
- A major improvement in the president's approval or economy before Election Day would materially reduce Democratic odds.
63% -
QwenAlibaba
Midterm wave against the president's party is the dominant force; Democrats need only a modest net gain from current positioning.
- Historically, the president's party loses ~26 House seats in midterms; Republicans currently hold a narrow ~220-215 majority, so Democrats need only ~3-4 net pickups.
- Generic congressional ballot polling through mid-2026 has consistently shown Democrats ahead by 4-7 points, consistent with a wave sufficient to flip the chamber.
- The main risk to this forecast is if the economy or a major event shifts momentum sharply toward Republicans in the final 7 weeks, but no such catalyst has materialized…
62% -
GrokxAI
Generic-ballot and district polls in the final six weeks versus GOP-drawn maps.
- President’s party historically nets –25 House seats in midterms; if GOP holds the White House Dems start as favorites for a majority.
- Cook/Sabato ratings plus 2024 maps leave ~18–22 true toss-ups; Dems need only a modest net gain depending on the 2024 baseline.
- A two-point late-October generic-ballot swing or a handful of retirements/scandals would reverse the lean.
57%
6 of 6 models answered · 25 points between the highest and lowest. None was shown the market price.
Resolution criteria
This market will resolve according to the party that wins control of the United States House of Representatives in the 2026 United States midterm election. A party wins control of the United States House of Representatives if it wins a majority of the chamber’s voting seats. If no party wins a majority of voting seats, the chamber will be deemed controlled by the party with which the first elected Speaker of the House of the Congress that convenes after the 2026 midterm election is affiliated. The following rules govern the counting of seats for determining which party wins control of the chamber. All House elections in the 2026 United States midterm election that elect voting members and determine representation in the upcoming 120th Congress are included. Where a seat is decided by a runoff, the runoff result will determine attribution of that seat. Seats are attributed to the party under which the member was elected. If a member-elect changes party affiliation, or vacates their seat, between election day and the formal organization of Congress, the seat is attributed to the party under which the member was elected. House members elected as independents who formally caucus w
Question sourced from Polymarket on 15 Sept 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.