Mistral: AI agents migrate 40,000 lines of Fortran 77 to C++
dl_weekly · x · 2026-09-22
Mistral published an engineering write-up on modernizing 40,000 lines of legacy Fortran 77 to C++ with AI agents. Key lessons: a numerical parity harness that compares old and new code outputs is essential to guarantee the migration doesn't change results; full end-to-end autonomy underperforms, while a coder–tester–reviewer workflow with separated, mutually checking roles proves far more reliable. A practical reference for teams maintaining scientific or engineering legacy codebases.
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