Mellum-4b-base is JetBrains' first open-source large language model (LLM) optimized for code-related tasks.

The best alternative to Emdash is Mellum, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Emdash and six of them are so hopefully you can find a suitable replacement. Other interesting alternatives to Emdash are Mistral Vibe for Code, JetBrains Junie, JetBrains Air and JetBrains AI Assistant.
Mellum-4b-base is JetBrains' first open-source large language model (LLM) optimized for code-related tasks.

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You think it, Junie helps make it happen – right in your IDE. Available on IntelliJ IDEA, PyCharm, WebStorm and .




JetBrains Air is the Agentic Development Environment where Codex, Claude Agent, Gemini CLI, and Junie execute independent task loops without interfering with each other.




With JetBrains AI, your favorite tools gain new abilities while you are empowered with more information at your fingertips.

A Windows desktop app for running multiple AI coding agents side-by-side — Claude Code, Codex, GitHub Copilot, or any CLI tool — in a tabbed and grid-layout terminal host.
