$400k of codex and five months vs $20k of opus and two weeks is crazy.
but the second run inherited five months of repo state, tests, failed approaches and a much sharper definition of done. I’d love to see what changed before opus took over.
Announcing tsc-rs (aka ts-rust), my complete rewrite of the Typescript compiler, type checker, and LSP, all in Rust.
This is a project I've had agents working on for 5 months now. I burned ~$400k of Codex tokens and got nowhere. Burned ~$20k of Opus and got there in 2 weeks.
I have not read a single line of the code.
tsc-rs is an open source drop-in replacement for tsc, and it's available now.