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description: ".NET 11 is here with C# 15, faster developer tools, runtime and library improvements, and new capabilities for web, mobile, desktop, and AI apps."
lang: en
---

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Microsoft · Nov 10, 2026 · v11 · open source

# .NET

.NET 11 is a major release of the .NET development platform featuring C# 15, runtime optimizations, and enhanced support for building AI-powered, agentic applications. It introduces significant language improvements like union types and closed hierarchies, alongside performance enhancements for web, mobile, and desktop development.

featured on blog .NET C# Software Development AI

visit website: https://dotnet.microsoft.com/en-us/

docs ↗: https://learn.microsoft.com/dotnet/core/whats-new/dotnet-11/overview
playground ↗: https://dotnet.microsoft.com/en-us/download/dotnet/11.0

on the blog Microsoft Introduces dotnetup: A Toolchain Manager for .NET 4 min (https://aideveloper44.com/blog/microsoft-introduces-dotnetup-toolchain-manager)

overview

key features

- 01 C# 15 support with union types and closed hierarchies
- 02 Native AOT CLI host and warm MSBuild server for faster development
- 03 AI-powered development tools including Microsoft.Extensions.AI and Microsoft Agent Framework
- 04 ASP.NET Core enhancements with OpenAPI 3.2 and asynchronous validation
- 05 .NET MAUI adoption of CoreCLR as the default runtime
- 06 Built-in Zstandard compression and new in-memory stream adapters

related products browse all → (https://aideveloper44.com/releases)

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