Claude Wrote a C Compiler that Couldn't Compile... ?

Anthropic's Claude Code attempted to build a C compiler in Rust using 16 AI agents, producing 501 commits and thousands of files targeting four CPU architectures. However, the resulting compiler couldn't compile even a simple Hello World program, with bugs in ARM/x86 assemblers, missing C11 features, and no working build across any commit. A company called Blitzy then fixed all critical issues in the original repo and built an entirely new C compiler from scratch using their own multi-agent orchestration platform. Their BlitzCC compiler generated ~230,000 lines of Rust, passed 2,271 tests with zero failures, and successfully compiled SQLite, Lua, and the Linux kernel — all with just two human prompts versus 2,000 interactive turns required by Anthropic's approach. The key takeaway is that agent orchestration methodology matters enormously: Blitzy's approach of building a deep codebase knowledge graph and running thousands of parallel QA-checked agents over days outperformed Claude Code's more interactive, human-guided workflow.