GitHub moves Copilot runtime to Rust, with AI agents writing 800,000 lines of code

Sep 16, 2026 · Issue 7 · 7 sources, 7 articles

GitHub migrated the Copilot runtime to Rust and used Copilot itself to do it; a Hungarian report says the agents wrote 800,000 lines of code. The announcement was published on 16 September.

Who is affected and how

senior developer

The case is a practical example of a large-scale language migration carried out with agents.

tech lead

Migration plans should weigh agent-based code rewriting and the test coverage it requires.

CTO

A Rust migration with AI is a possible way to reduce technical debt and is worth trying as a pilot.

Narrative: Software factory: agents now write code

Sources

• Migrating the GitHub Copilot runtime to Rust, using Copilotthe github blog · Sep 16, 2026
• GitHub Migrates Copilot Runtime to Rustanalytics india magazine · Sep 17, 2026
• Migrating the GitHub Copilot runtime to Rust, using Copilot - The GitHub Bloggithub.blog · Sep 17, 2026
• GitHub Used AI Agents to Rewrite Copilot’s Runtime in Rusttechscoop.substack.com · Sep 17, 2026
• GitHub Copilot、実行基盤をRustへ刷新　128件の分割反映で性能向上｜AI PICKSaipicks.jp · Sep 17, 2026
• GitHub used Copilot to rewrite its own Copilot runtime in Rust | The Polietypoliety.com · Sep 17, 2026
• GitHub Copilot runtime switched to Rust, AI agents wrote 800 thousand lines of codeaiforradalom.hu · Sep 17, 2026 · magyar

Machine-generated summary based on the titles and excerpts of the source articles. The facts come from the linked article.