CLion 2025.3 Is Here, and It’s Epic: Faster Language Engine, Unique Constexpr Debugger, DAP Support, and Much More
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CLion 2025.3 introduces CLion Nova as the default C/C++ language engine, delivering up to 4x faster performance in code completion, highlighting, and refactoring. The release features a unique Constexpr Debugger for compile-time evaluation insights, Debug Adapter Protocol (DAP) support for third-party debuggers, and C++26 language features including pack indexing and expansion statements. Additional updates include enhanced embedded development tools with bundled Serial Port Monitor and PlatformIO plugins, improved STM32/STM8 support, Visual Studio 2026 toolchain compatibility, multiagent AI assistance with Junie and Claude Agent, and the new Islands UI theme as default.
Table of contents
Faster performance with the new language engineFAQ about CLion NovaConstexpr Debugger: Insight into compile-time evaluationsExpanded debugger support with DAP technologyNew default look: the Islands themeEmbedded developmentBuild tools and project formatsC++ language updatesUpdates to AI toolsCode completion in the terminalTry CLion and tell us what you thinkSort: