Good thing I work on an old C++ code base where it's impossible for AI to go through the millions of lines that all interact horribly in unpredictable ways.

Is all marketing, it does not even work with js frontend frameworks.

Funny you mention that, I have very recently just came back from a one-shot prompt which fixed a rather complex template instantiation issue in a relatively big very convoluted low-level codebase (lots of asm, SPDK / userspace nvme, unholy shuffling of data between numa domains into shared l3/l2 caches). That codebase maybe isn't in millions of lines of code but definitely is complex enough to need a month of onboarding time. Or you know, just give Claude Opus 4.5 a lldb backtrace with 70% symbols missing due to unholy linker gymnastics and get a working fix in 10 mins.

And those are the worst models we will have used from now on.