EvoX Genesis Built a 250k-Line Rust C Compiler Over 120 Hours and 1,000 Agent Episodes for $44 in Model Tokens

arXiv 2608.10450·high signalXBlueskyLinkedInCopy link

Genesis makes the software project persistent while letting individual coding agents stay finite-lived: each local world is situated by an accepted version and repo path, agents propose local changes, recursive delegation moves work across paths, and only accepted consequences advance version history. Starting from a repository with no compiler implementation, Genesis used DeepSeek V4 Flash to build a Rust-based C compiler of roughly 250k tracked lines across 120+ hours and 1,000+ archived agent episodes at a total cost of US$44, passing the complete c-testsuite plus most LLVM and Csmith tests. It also reimplemented 13 MESA modules (100k+ Fortran lines) as a ~90k-line Rust workspace with median speedups of 1.55–6.87x across six numerical workloads.