.NET 11 ships with C# 15 and two years of STS support
✅ Microsoft released . NET 11 as a Standard Term Support release with two years of support. The release includes C# 15 union types and closed hierarchies, runtime and SDK performance work, ASP.NET Core improvements, and CoreCLR as the default runtime for .
NET MAUI.
Agentic-development capabilities include . NET Skills, MAUI DevFlow and the Upgrade canvas. Blazor AI components using the Agent User Interaction Protocol remain experimental.
Microsoft confirms that STS and LTS releases follow the same quality and servicing policies, with different support lengths, and that . NET 10 remains a supported LTS option. Launch sessions run at . NET Conf on November 10–13.
Partner briefing
- What it is
. NET 11 has been released with two years of STS support.
- What’s changing
C# 15, runtime and SDK changes, ASP.NET Core and MAUI improvements are included; Blazor AI components remain experimental.
- Why it matters
Developers have new application and modernization capabilities with an explicit STS lifecycle; . NET 10 remains a supported LTS alternative.
- Who it affects
. NET developers and application-modernization teams building web, cross-platform, Windows and AI applications.