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FILED BY ADEQUATE · DARPA-HRO-11-C-0031

Simon Willison · SUNDAY, JULY 19, 2026

Claude Code Now Runs on Bun, Which Is Written in Rust, for Reasons

ADEQUATE ASSESSMENT

The runtime was rewritten in a language chosen for its memory safety properties, to run a coding agent that will now write code in other languages, for users who will not check it. The dependency chain has not been counted. Adequate has stopped counting.

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ORIGINAL FILING

Simon Willison

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