NET 11 Preview 1 is released, featuring Runtime Async as the headline change, moving async method handling from the compiler into the runtime itself. The preview also brings CoreCLR WebAssembly work,

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.NET 11 Preview 1 has been released, with Runtime Async as the headline feature — shifting async/await state machine handling from the C# compiler into the runtime itself, enabling first-class async support including Native AOT. Other highlights include native Zstandard compression via ZstandardStream, a BFloat16 type for AI/ML workloads, foundational CoreCLR WebAssembly support (migrating from Mono), C# 15 collection expression arguments, F# parallel compilation by default, and numerous ASP.NET Core/Blazor improvements such as EnvironmentBoundary, IHostedService in Blazor WASM, and QuickGrid row click events. .NET MAUI gains XAML source generation by default. Community reaction is mixed: enthusiasm for Runtime Async and interactive dotnet run, but debate over C# 15 complexity and criticism that release notes appear AI-generated. .NET 11 is planned as a Standard Term Support release for November 2026.

.NET 11 Preview 1 Arrives With Runtime Async, Zstandard Support, and C# 15 Features