Junie by JetBrains

Junie by JetBrains is an AI coding agent designed to accelerate real development workflows rather than just suggest snippets. It brings autonomous code planning and implementation into the JetBrains ecosystem, letting developers delegate multi-step coding tasks and receive production-ready output. A standout capability is its two-model approach: Junie uses a powerful model for planning and a faster model for execution. This separation preserves the reasoning quality required for complex refactors and architecture decisions while keeping inference costs and latency low during the repetitive parts of implementation. Junie integrates tightly with JetBrains IDEs, giving it awareness of project structure, build systems, and language tooling. Developers can choose from a broad range of supported models, so teams can match Junie to their security, compliance, or performance requirements instead of being locked into a single provider. On the independent SWE-Rebench benchmark, Junie demonstrates strong performance resolving real-world software engineering tasks pulled from open repositories. That benchmark focus makes it well suited for handling bug fixes, feature scaffolding, and codebase navigation rather than only toy examples. Because Junie is built by JetBrains, it benefits from deep familiarity with languages like Kotlin, Java, Python, and JavaScript, and it understands the conventions of the IDEs developers already use every day.