I've had issues with Claude and memory related bugs in C. Maybe small programs or prototypes it's fine if you can verify the output or all the expected inputs, but the moment the context is >50k lines or even doing something with pthreads, you run into the exact same problems as humans.

I think Claude would do much better with tools provided by modern C++ or Zig than C, frankly, anyways. Or even better, like the Rust people have helpfully mentioned, Rust.