International Mathematical Olympiad 2026 (IMO 2026)
We show this table for reference; we do not rank on it.
Proof-based olympiad performance on all six IMO 2026 problems.
Benchmark score on IMO 2026 — October 27, 2026
We compile the IMO 2026 rows from provider self-reports. Claude Opus 5 leads the table at 42/42, followed by Apodex 1.1 (31/42). We do not use these results to rank models overall.
Claude Opus 5
Anthropic
Apodex 1.1
Apodex
2 modelsMathematicsCurrentDisplay onlyUpdated October 27, 2026
Benchmark score table (2 models)
| Rank | Model / configuration | Score | Parameters (B) | Open / closed |
|---|---|---|---|---|
| 1 | Claude Opus 5Anthropic | 42/42 | Not reported | Closed |
| 2 | Apodex 1.1Apodex | 31/42 | Not reported | Closed |
About IMO 2026
Year
2026
Tasks
6 proof-based problems
Format
Official-style proof score
Difficulty
International olympiad mathematics
Section 8.6 reports four independent no-tool solutions per problem. All 24 were accepted by a three-model panel, and human experts awarded one pre-specified solution per problem full credit.
Freshness and provenance
Version
IMO 2026 2026
Refresh cadence
Quarterly
Staleness state
Current
Question availability
Public benchmark set
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
Questions
What does IMO 2026 measure?
Proof-based olympiad performance on all six IMO 2026 problems.
Which model scores highest on IMO 2026?
Claude Opus 5 by Anthropic currently leads with a score of 42/42 on IMO 2026.
How many models are evaluated on IMO 2026?
2 AI models have published results on IMO 2026 in the BenchLM catalog.
Compare top models on IMO 2026
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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