Release2 sources
ReSharper 2026.3: Claude Agent and Codex in Visual Studio, .NET 11 and C# 15 Support, and More
JetBrains Blog · By Mehul Harry ·
The Brief · written from 2 sources
- JetBrains released ReSharper C++ 2026.3 with a new Class Layout tool window that visualizes the memory layout of classes and helps spot wasted space.
- The release extends format string analysis to cover std::format, std::print, and the {fmt} library.
- ReSharper 2026.3 adds Claude Agent and Codex as agent options in the Visual Studio tool window alongside Junie, and supports .NET 11 and C# 15.
Why it matters
C++ developers using ReSharper C++ get a tool to find wasted space in class layouts and more format string checks for std::format, std::print and {fmt}. Visual Studio users of ReSharper get additional agent choices.
Who’s affected
- ReSharper C++ users
- ReSharper users in Visual Studio
- C# and .NET 11 developers using ReSharper
- ReSharper C++ 2026.3
- ReSharper 2026.3
- ReSharper 2026.2
- .NET 11
- C# 15
- #c++
- #resharper
- #jetbrains
- #static-analysis
- #visual-studio
- #dotnet
ReSharper 2026.2 brought Junie to Visual Studio as ReSharper’s first coding agent. In 2026.3, you can also pick Claude Agent or Codex in the same tool window. All three agents can use ReSharper’s refactoring skill to run refactorings such as Rename . This release also supports…
Timeline
ReSharper C++ 2026.3 and ReSharper 2026.3 announced on the JetBrains Blog
The JetBrains Blog
ReSharper C++ 2026.3: Class Layout, Format String Analysis, And More
The JetBrains Blog
ReSharper 2026.3: Claude Agent and Codex in Visual Studio, .NET 11 and C# 15 Support, and More
Full coverage · 2 sources
- 2h ago ↗
The JetBrains Blog
ReSharper 2026.3: Claude Agent and Codex in Visual Studio, .NET 11 and C# 15 Support, and More
- 7h ago ↗
The JetBrains Blog
ReSharper C++ 2026.3: Class Layout, Format String Analysis, And More