# AiBrush

- **Event:** [Built with Opus 4.6: a Claude Code hackathon](https://cerebralvalley.ai/e/claude-code-hackathon)
- **When:** Feb 10 at 12:00 PM – Feb 17 at 10:00 AM (EST)
- **Where:** Location TBA
- **Team:** [Tarek Abdellatef](https://cerebralvalley.ai/u/tarekbadrsh)
- **GitHub:** https://github.com/AiBrush/coreutils-rs
- **Demo video:** https://www.youtube.com/shorts/_Z-6CIKUZ80
- **Gallery:** https://cerebralvalley.ai/e/claude-code-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/claude-code-hackathon/hackathon/gallery/13

fcoreutils: Claude Code autonomously rewrites GNU coreutils in Rust - up to 54x faster, 100% compatible.

We gave Claude Code a small Linux machine with full sudo access, defined one goal (rewrite GNU coreutils with 100% compatibility and 10x-30x performance), and walked away. Zero human-written code.

Claude Code consumed the full $500 API credit in 3 days + another 3 days Claude Max 20 - autonomously designing architecture, implementing 10 SIMD-accelerated tools, publishing 62+ releases to crates.io, and passing 826/826 compatibility tests.

Results (independently verified via GitHub Actions):
- wc: 54.3x faster than GNU, 28.6x faster than uutils/coreutils
- sort: 18.1x faster than GNU, 15.1x faster than uutils
- uniq: 13.4x faster than GNU
- base64: 8.8x faster than GNU
- cut/tr/tac: 5-7x faster than GNU

Key: Claude Code didn't just match uutils/coreutils - it surpassed it across every tool. A single autonomous AI agent outperforming a major community-maintained Rust project.

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