Full FrontierCode 1.1 leaderboard goes live, Claude Opus 5.5 leads at 52.2%
ArtificialAnlys · x · 2026-10-13
Artificial Analysis published the full FrontierCode 1.1 leaderboard page, linking Cognition's benchmark intro and methodology docs. Claude Opus 5.5 (max, default fallback) tops the board at 52.2%, followed by GPT-6.1 Sol (max) at 49.1% and Claude Fable 5.1 (max) at 49.0%. The benchmark, built with open-source maintainers, grades mergeability via six check types (classical tests, command checks, reverse-classical tests, adaptive tests, scope checks, LLM prompt review); failing any blocking check or having the trajectory scanner flag solution-lookup scores zero.
Related event: FrontierCode 1.1 Leaderboard Debuts: Opus 5.5 Leads at 52%(4 posts)→
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