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Microsoft Rewrites Copilot Runtime with AI-Powered Code Rewrite

Guavy AI Editorial Team
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MSFT
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Microsoft has successfully used artificial intelligence to rewrite its GitHub Copilot runtime from TypeScript to Rust. This project, led by AI agents, cost around $120,000 in token expenses and three weeks of work from a single engineer.

The original architecture was built on TypeScript and Node.js, which exposed bottlenecks in startup latency, memory consumption, and server density when deployed at scale.

After 14.5 weeks across 135 release versions, the AI agents converted approximately 430,000 lines of TypeScript into more than 800,000 lines of production-grade Rust code, resulting in a nearly 16x performance boost.

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