Microsoft agentically ports Copilot runtime to Rust for $120K

The Rust compiler remains unperturbed by the antics of the LLM

Microsoft has rewritten the runtime for its popular AI-powered writing tool, Copilot, using the Rust programming language. This $120,000 project, completed in just three weeks, involved over 135 releases and converted 430,000 lines of TypeScript code into 800,000 lines of Rust. The rewrite resulted in a 15.9x speedup in performance and significantly reduced memory usage, consuming only 126 MB compared to the previous 1,383 MB.

Copilot, which is integrated into various Microsoft products like GitHub, VS Code, Excel, and Office applications, will benefit from these improvements.

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