Best LLM for Reasoning in 2026
Models from the last 12 months, ranked by a composite of GPQA and AIME (2026 and 2025). These benchmarks test graduate-level science, competition mathematics, and multi-step logical reasoning.
Updated automatically as new models release. Full benchmark leaderboard →
What makes a good reasoning model?
Reasoning benchmarks test whether a model can solve multi-step problems requiring planning, logic, and domain knowledge — not just pattern matching or retrieval.
- GPQA (Diamond) — Questions written by PhD-level experts in biology, chemistry, and physics. Designed so that non-experts who Google the answer still fail. The gold standard for deep scientific reasoning.
- AIME 2026 — The American Invitational Math Exam, 2026 edition. 30 hard problems, integer answers. The current math benchmark labs report — fresh numbers are resistant to training-data contamination.
- AIME 2025 — Same format, one year earlier. Used alongside 2026 for a more stable picture of math reasoning capability.
For tasks involving complex analysis, research, legal and financial reasoning, or scientific work, a high GPQA score is the best predictor of real-world performance.
Also see: Best Coding LLM, Best Cheap LLM, Compare any two models.