AnalysisAI ModelsOctober 28, 2026

Claude Opus 5.5 hits 18.5% on ProgramBench, up from 0%

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Claude Opus 5.5 (xhigh) resolves 18.5% of ProgramBench's 200 from-scratch rebuild tasks, per Jack Clark's Import AI. Every model scored 0% on the benchmark in May.

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