I reimplemented "claude" CLI with codex and gpt-5.4-high. It cost $1100 in tokens, and is 73% faster and 80% lower resident memory during sustained interactive use.
It is very easy to reverse claude from npm distribution, then reimplement is 1:1. It is indistinguishable from the
Sorry to break it to some of you but every AI engineering approach that requires you to write exhaustive specs beforehand is going to fail.
Your specs suck.
Always have. Always will.
We learned that lesson decades ago.
