What 16 parallel agents building a C compiler teach about running agents at scale

Sun, 04 Oct 2026 12:00:00 +0000

Anthropic’s engineering team handed 16 Claude instances a goal, a shared repo and a test suite, and let them write a C compiler in Rust. The result, described in an engineering post , is a roughly 100,000-line compiler that can build Linux 6.9 on x86, ARM and RISC-V, plus projects like SQLite, postgres and redis. It took nearly two weeks, close to 2,000 Claude Code sessions, 2 billion input tokens and 140 million output tokens, for just under $20,000.

Make Claude Code run your tests before it's allowed to say it's done

Wed, 30 Sep 2026 07:00:00 +0000

Telling Claude Code to run the tests in CLAUDE.md is a request. It usually works, and sometimes it doesn’t. If you want it to work every time, Claude Code has a mechanism for that: a Stop hook, a script that runs when Claude thinks it’s finished and can refuse to let it stop.

Testing on Tokenise

What 16 parallel agents building a C compiler teach about running agents at scale

Make Claude Code run your tests before it's allowed to say it's done