Best AI for Complex Reasoning
Which AI reasons best under pressure? Ranked across 11 challenges: contracts, architectures, ethics, history, business, and multi-stakeholder dilemmas.
How Complex Reasoning rankings are computed
Rankings are based on 20 models tested across 13 complex reasoning challenges. Each model is scored using a five-signal composite: 30% Rival Index (with product-line inheritance for new models), 20% task coverage, 20% challenge-scoped duel performance, 15% model recency, and 15% model tier. Models are deduplicated by product line so only the newest version per model family appears. Gemini 3.1 Pro Preview currently leads with a score of 97.7/100. All ranking data is part of Rival's open dataset of 21,000+ human preference votes.
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Full Rankings
20 models
vsAsk them anything yourself
What is the best AI for complex reasoning?
Rival ranks AI models for complex reasoning using a five-signal composite algorithm across 13 challenges: 30% Rival Index, 20% task coverage, 20% challenge duels, 15% recency, and 15% model tier. Newer models inherit Rival scores from predecessors within their product line, and only the newest version per model family is shown. As of the latest refresh, Gemini 3.1 Pro Preview leads with a composite score of 97.7/100.
How are AI models ranked for complex reasoning on Rival?
Each model is scored with a multi-signal composite: 30% Rival Index, 20% task coverage, 20% challenge duels, 15% recency, and 15% model tier, plus a small bonus for major AI providers. Rankings are based on 20 models tested across 13 complex reasoning challenges. Models are deduplicated by product line (e.g., only the latest GLM or GPT version appears). All duel votes are blind: voters see responses without knowing which model produced them.
Can I compare AI models for complex reasoning?
Yes. Each model in the ranking links to its profile page, and you can compare any two models side-by-side on Rival's Compare page to see their actual responses to complex reasoning challenges.
How often are the complex reasoning rankings updated?
Rankings are refreshed every few hours. They incorporate the latest Rival Index scores from community duels, model recency, and any new model responses added to the platform. All ranking data is part of Rival's open dataset.