To me applying LLMs to a python (or similarly dynamic) code base where it’s currently spaghetti and monkey patched, it can miss things just like I can.

But… I have to admit Opus 4.7 has been very pragmatic in detecting root causes and proposing sensible fixes to bugs in this situation (ie bugs encountered in production not compile time).

It’s also fine at matching current styles and conventions (which is great if they are good styles and conventions).

In terms of new code, rust would have been near impossible to write with such a high degree of non-local reasoning, so I’m assuming these bugs wouldn’t be present.