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FrontierMath Tier 4 v2

The hardest private FrontierMath problems, corrected v2 set, with Python tools. Separate from Tiers 1-3 in the core score.

ModelConfigurationResultTest date
GPT-6.1 SolGPT-6.1 Sol (max)100.0* %2026-09-29
Claude Opus 5.5Claude Opus 5.5 (max)95.0* %2026-09-22
GPT-6.1 TerraGPT-6.1 Terra (max)92.7* %2026-10-26
Claude Fable 5Claude Fable 5 (max)90.2* %2026-06-09
GPT-6 SolGPT-6 Sol (max)90.0* %2026-09-22
Claude Fable 5.1Claude Fable 5.1 (max)87.8* %2026-09-01

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* Provisional data