[goatlover]

If it's not trained on the legacy code, I have my doubts it will be able to re-write it well enough to replace a human baby sitting it, particularly when we're talking about large projects. As impressive as ChatGPT is at spitting out code examples, what gives you confidence that and LLM could rewrite a million lines of legacy code it has never seen before? That seems to be well beyond the ability of any AI that's been developed so far.