CC does it extremely good. As an example, I refactored tonight like 10000 lines of code in 320 subs ... just made 2 or 3 bugs (2 of them, he forgot a CLNG, and the other he forgot to make a sub altought he documented it) because when context window gets full (about 200k tokens), it begins to forget some stupid things (like all LLMs). Just mantain it under 200k, and Claude Code + opus 4.6 with mcp is really a game changer (nothing similar I've ever tested... and believe me that I have slept little this year testing things hahhahah)