# Microsoft Releases .NET 11 RC1 with Go-Live Support, C# 15 and F# 11 as Default Language Versions

DevFeed: [Microsoft Releases .NET 11 RC1 with Go-Live Support, C# 15 and F# 11 as Default Language Versions](<https://devfeed.tech/articles/microsoft-releases-net-11-rc1-with-go-live-support-c-15-and-f-11-as-default-language-versions-26600.md>)

Original publisher: [Read original article](<https://www.infoq.com/news/2026/09/dotnet-11-rc-1-release/>)

Author: Almir Vuk

Published: 2026-09-15T07:11:00Z

Content type: news

Language: en

Sources: [InfoQ](<https://devfeed.tech/sources/infoq.md>)

Topics: [.NET 11](<https://devfeed.tech/topics/net-11.md>), [C# 15](<https://devfeed.tech/topics/c-sharp-15.md>), [Microsoft](<https://devfeed.tech/topics/microsoft.md>), [releases](<https://devfeed.tech/topics/releases.md>), [ASP.NET Core](<https://devfeed.tech/topics/asp-net-core.md>), [F#](<https://devfeed.tech/topics/fsharp.md>), [SignalR](<https://devfeed.tech/topics/signalr.md>), [SDKs](<https://devfeed.tech/topics/sdks.md>), [.NET MAUI](<https://devfeed.tech/topics/net-maui.md>), [native aot](<https://devfeed.tech/topics/native-aot.md>)

Tags: [android](<https://devfeed.tech/tags/android.md>), [api](<https://devfeed.tech/tags/api.md>), [asp-net-core](<https://devfeed.tech/tags/asp-net-core.md>), [c-sharp-15](<https://devfeed.tech/tags/c-sharp-15.md>), [development](<https://devfeed.tech/tags/development.md>), [dotnet-11-rc-1-release](<https://devfeed.tech/tags/dotnet-11-rc-1-release.md>), [f-sharp](<https://devfeed.tech/tags/f-sharp.md>), [ios](<https://devfeed.tech/tags/ios.md>), [macos](<https://devfeed.tech/tags/macos.md>), [microsoft](<https://devfeed.tech/tags/microsoft.md>), [native-aot](<https://devfeed.tech/tags/native-aot.md>), [net](<https://devfeed.tech/tags/net.md>), [net-10](<https://devfeed.tech/tags/net-10.md>), [net-11](<https://devfeed.tech/tags/net-11.md>), [net-9](<https://devfeed.tech/tags/net-9.md>), [net-core](<https://devfeed.tech/tags/net-core.md>), [net-maui](<https://devfeed.tech/tags/net-maui.md>), [news](<https://devfeed.tech/tags/news.md>), [releases](<https://devfeed.tech/tags/releases.md>), [sdk](<https://devfeed.tech/tags/sdk.md>), [signalr](<https://devfeed.tech/tags/signalr.md>)

## AI overview

Microsoft released .NET 11 Release Candidate 1 with go-live support for production use. It makes C# 15 and F# 11 the default language versions and stabilizes features from the preview cycle. The release also extends testing across mobile and desktop targets, updates SignalR authentication refresh APIs, and adds SDK, ASP.NET Core, Blazor, and Native AOT-related improvements.

## Source excerpt

Last week, Microsoft has released .NET 11 Release Candidate 1, the first release candidate of the cycle, shipping with a go-live support license for production use. The release makes C# 15 and F# 11 the default language versions, extends dotnet test to mobile and desktop targets, finalizes the SignalR authentication refresh APIs, and improves Android build times in .NET MAUI. By Almir Vuk