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Tuesday, February 10, 2026
AI built C compiler by Opus 4.6 from Anthropic; Chris Lattner post (!)
Building a C compiler with a team of parallel Claudes \ Anthropic
Over nearly 2,000 Claude Code sessions across two weeks, Opus 4.6 consumed 2 billion input tokens and generated 140 million output tokens, a total cost just under $20,000. Compared to even the most expensive Claude Max plans, this was an extremely expensive project. But that total is a fraction of what it would cost me to produce this myself—let alone an entire team.
This was a clean-room implementation (Claude did not have internet access at any point during its development); it depends only on the Rust standard library. The 100,000-line compiler can build a bootable Linux 6.9 on x86, ARM, and RISC-V. It can also compile QEMU, FFmpeg, SQlite, postgres, redis, and has a 99% pass rate on most compiler test suites including the GCC torture test suite. It also passes the developer's ultimate litmus test: it can compile and run Doom.
Asynchronous software development with a team of Claudes - YouTube
elaborate comment about this, from very competent person (creator of many leading compilers)
Modular: The Claude C Compiler: What It Reveals About the Future of Software
by
Chris Lattner
"Compilers occupy a special place in computer science. They're a canonical course in computer science education. Building one is a rite of passage. It forces you to confront how software actually works, by examining languages, abstractions, hardware, and the boundary between human intent and machine execution. Compilers once helped humans speak to machines. Now machines are beginning to help humans build compilers."
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