Claude Opus 5.5 rebuilt the TypeScript compiler in Rust for about 24,000 dollars
A developer spent over 400,000 dollars of tokens on OpenAI models trying to port the TypeScript compiler to Rust and got stuck at 84 percent. Claude Opus 5.5 started from scratch, had a working version in 10 hours and passed all 181,711 ported tests in two weeks for about 24,000 dollars.