Also if you were doing it personally you'd probably not take the whole codebase, but look at function signatures/docs as you get further away from the code you

Also if you were doing it personally you'd probably not take the whole codebase, but look at function signatures/docs as you get further away from the code you care about. While there's probably benefits in clever systems for summarising and iteratively working on the code, you can get away with just cramming a load of context in. I have been playing with GPT4 and it's good. It's easy to imagine a bunch of use cases where even the maximal cost of a few dollars ($1.80 ish for the context alone) for a single query is worth it. If it's good enough to save you time, it's very easy to cross the threshold where it's cheaper than a person.