.NET 11 RC1 arrives with Go-Live support ahead of November 2026 release

Microsoft released .NET 11 RC1 with Go-Live support, allowing production use of the release candidate. Updates span the runtime, SDK, C# 15 with union types, ASP.NET Core, Blazor and .NET MAUI moving to CoreCLR. The final release is expected in November 2026 alongside .NET Conf 2026.

• .NET 11 RC1 shipped on September 8, 2026 with Go-Live support
• C# 15 introduces union types and other language features
• .NET MAUI moves to CoreCLR on Android, iOS and Mac Catalyst
• .NET 10 stays LTS, supported through November 14, 2028