In November 2022, .NET 7 and ChatGPT were released with a three-week gap. It became a convenient reference point: .NET 7 was the last release written before ChatGPT. In May 2025, the Copilot coding agent arrived in dotnet/runtime, and by the end of October 2026, it had opened 1734 pull requests, 1207 of which were merged.Does AI break code? You can argue for a long time, but performance can be simply measured. I measured DI, configuration, logging, cache,