C to Fortran transpiler A developer used AI models Codex and Claude to create a Python-based transpiler that converts C code to modern Fortran, successfully translating several numerical C programs. The tool is being tested on larger code bases. I used Codex and Claude to write in Python a transpiler from C to modern Fortran. It correctly translates a handful of numerical C codes at the repo, and I will test it on larger C code bases.