Benchmark Almanac

IMO 2026

Claude Opus 5 100% Only in system cards

Models write full proofs for the six problems of the 2026 International Mathematical Olympiad. Proofs are scored out of 42 points.

A one-time competition exam held July 15 and 16, 2026. Labs grade proofs with their own rubrics or judges.

Made by International Mathematical Olympiad , hosted in Shanghai , China Released Jul 2026 Written proofs All tasks public Last in a system card Jul 2026 Last model added Jul 2026
Level
Competition The strongest students, in olympiad-style contests
Scored
Graded by people Human experts grade or compare the outputs.
Answers
Written proof
imo-official.org
1
Model scored in lab cards
1
System card reports it, from 1 lab

Claude Opus 5 leads with 100%

Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.

  1. 100.0 Claude Opus 5
  1. 1 Claude Opus 5 100%
#ModelScoreSettingDateSource
1 Claude Opus 5 100% Jul 2026 Model card

The best score passed 85% in Jul 2026

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Reported by the lab in its model card
0% 20% 40% 60% 80% 100% Near the ceiling (85%) Claude Opus 5 0% 20% 40% 60% 80% 100% Near the ceiling (85%) Claude Opus 5

Labs report it only in system cards

We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark. Some system cards do, below.

One system card reports it

Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.

DateDocumentScoreAs the document writes itSection
24 Jul 2026 Claude Opus 5 system card 100 IMO 2026, 42/42 points, all 24 solutions (4 per problem) judged correct by a three-model panel, one per problem confirmed 7/7 by human experts, no tools, max effort (8.6) Capabilities

Versions

Replaces IMO 2025

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