AnalysisAI ModelsAugust 17, 2026

MirrorCode benchmark shows AI can reimplement complex software

MirrorCode, a benchmark co-developed with METR, tests long-horizon coding by having AI reimplement CLI programs from specs. Claude Opus 4.6 reimplemented gotree, a ~16,000-line Go bioinformatics toolkit, a task estimated to take a human 2–17 weeks.

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