IntelliJ IDEA 2025.1 Release: AI Assistant Integration and Java 24 Support

IntelliJ IDEA 2025.1 has been officially released, featuring major updates including comprehensive Java 24 support, Kotlin K2 mode as default, and significant enhancements to JetBrains AI Assistant. The AI functionality has been upgraded with integration of AI Assistant and Junie into a unified subscription plan, offering free access to core features within the IDE. New capabilities include smarter code completion, support for advanced cloud models like OpenAI GPT-4.1, Claude 3.7 Sonnet, and Gemini 2.0 Flash, as well as multi-file editing from chat windows.

Key improvements also include enhanced debugging with pause/resume functionality for watch expressions, a redesigned terminal based on standard-compliant core, streamlined UI options for Windows/Linux users, and direct search within rendered Markdown previews. Framework support has been optimized with automatic Spring Data repository creation, improved HTTP Client behavior, Liquibase changeset support, Kafka record export capabilities, and enhanced container technology features including native Containerfile support and Dockerfile instruction validation.

Build tool optimizations now allow native toolchain configuration for Gradle Daemon, automatic source code download for libraries, and version control system improvements including inline commit details in diff views, custom tool integration as run configurations, automatic Git remote updates, and options to skip Git hooks during commits.