I'm always surprised how large harnesses are By comparison, the recently open sourced grok harness was 840k lines, codex 950k, pi 250k https://simonwillison.ne

I'm always surprised how large harnesses are By comparison, the recently open sourced grok harness was 840k lines, codex 950k, pi 250k https://simonwillison.net/2026/Jul/15/grok-build/ https://simonwillison.net/2026/Jul/15/grok-build/