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About this paper
Xuanzhengbo Ren, Takashi Shimokawabe, Hisashi Yashiro
Claude Code translated NICAM from Fortran/OpenACC to C++/Kokkos under human direction, with component tests, integration runs, and ensemble checks. For a selected production configuration, a 120-step run on GH200 took 47.3 seconds, versus 81.0 seconds for the Fortran reference. Across 59 diagnostics in 10-day ensembles, 95.3% of scores fell within two reference standard deviations; evidence is limited to these tests.
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