TLDR Tech / IT
Anthropic runs large-scale code migrations with Claude Code
Anthropic describes how developers used Claude Code to run large-scale code migrations using an iterative process with strong “judge”/test gates. Examples include Bun's Zig-to-Rust port (~1M lines in <2 weeks) and a Python-to-TypeScript port (~165K lines) done over a weekend with parity checks and multiple review rounds.
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