Goodbye Mono: Why Unity is Switching to CoreCLR

Recently, in a video from the GDC 2026 session, Joe Valenzuela, senior director of the Core Engine team, shared plans for Unity’s transition to the CoreCLR runtime. There is talk that the engine needs a modern one.NET, we’ve been in the community for over five years now. There have also been occasional reports in the Unity community that there is a desire to switch to CoreCLR, but there have always been many difficulties.