Mathematics benchmark
IMO 2026 leaderboard
International Mathematical Olympiad 2026. Every model the catalog carries a published IMO 2026 value for, ranked by that value.
CategoryMathematics
MeasureOfficial-style proof score
Tasks6 proof-based problems
DifficultyInternational olympiad mathematics
Published byClaude Opus 5 System Card
Proof-based olympiad performance on all six IMO 2026 problems.
IMO 2026 ranking
2 models with a published IMO 2026 value, ordered by that value, highest first. Models the source has not scored on this benchmark are not listed — they are unmeasured, not last.
| Rank | Model | Provider | Official-style proof score |
|---|---|---|---|
| 1 |  Claude Opus 5 | Anthropic | 42 |
| 2 | APApodex 1.1 | Apodex | 31 |
Evidence key: Observed
Rows are ordered by the value Claude Opus 5 System Card published, highest first. The source does not state whether a higher value is the better result, so this page does not either: for a benchmark that measures a rate of failure, read the table from the bottom.