Best AI for Complex Reasoning
Which AI reasons best under pressure? Ranked across 11 challenges: contracts, architectures, ethics, history, business, and multi-stakeholder dilemmas. Updated for 2026, ranked across 11 challenges with data from 20 AI models.
Rankings
20 models
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Complex Reasoning Challenges
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Frequently Asked Questions
What is the best AI for complex reasoning?
RIVAL ranks AI models for complex reasoning based on real output quality across 11 challenges. The ranking combines task-specific response coverage (60%) with global RIVAL Index scores from blind community duels (40%).
How are AI models ranked for complex reasoning on RIVAL?
Models are scored using a composite algorithm: 60% comes from how many complex reasoning challenges the model has responses for (task coverage), and 40% from the model's global RIVAL Index score, which is based on blind duel win rates from the community.
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 blind duels and any new model responses added to the platform.