Version 16.1 of the GNU Compiler Collection (GCC) has been released. The C++ frontend now defaults to the GNU C++20 dialect and the corresponding parts of the standard library are no longer experimental. Several C++26 features receive experimental support, including Reflection (-freflection), Contracts, expansion statements and std::simd. Other changes include the introduction of an experimental compiler frontend for the Algol68 language, ability to output GCC diagnostics in HTML form, and more.