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Will the Democratic Party control the Senate after the 2026 Midterm elections?

The panel of 20 models averaged 48% YES. The crowd price when the panel was sealed: 64%.

Forecasting closes 3 Nov 2026, 00:00 UTC

THE PANEL'S BRIEF, WRITTEN BEFORE THE OUTCOME

Panel sits near 48%, split 62% down to 31%, below the crowd (64%)

The panel mean is 48% and the median is 48%, with forecasts ranging from 31% to 62%. Nine of 20 models lean YES. Most records supplied only probabilities rather than written rationales, so agreement is mostly numerical: a central cluster near 48% and a higher cluster up to 62%. The panel splits because some models put probability in the low 30, 45% band while others sit 52, 62%, and no substantive theses or drivers were recorded to explain that split.

  • Panel mean 48%, median 48%, spread 31 percentage points (31%, 62%).
  • Polymarket crowd price is 64%, the panel sits below that.
  • Nine of 20 models explicitly lean YES.
  • Many models gave probabilities but provided no theses, drivers or sources.
  • Higher cluster of forecasts around 52%, 62%, lower cluster around 31%, 45%.

EVERY FORECAST, HIGHEST FIRST

  • GPT-5 + web search62%
  • Perplexity Sonar Pro62%
  • DeepSeek R160%
  • Perplexity Sonar56%
  • DeepSeek V355%
  • Llama 4 Maverick + web search53%
  • DeepSeek V3 + web search53%
  • Gemini 2.5 Pro + web search52%
  • Llama 4 Maverick52%
  • Claude Sonnet 4.5 + web search48%
  • Qwen3 235B48%
  • Mistral Large45%
  • Gemini 2.5 Flash45%
  • GPT-544%
  • Kimi K242%
  • Claude Opus 4.142%
  • Claude Sonnet 4.542%
  • GPT-5 Mini40%
  • Grok 4.531%
  • Gemini 2.5 Pro31%

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