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

The best alternative to Kiro is Mellum, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Kiro and four of them are so hopefully you can find a suitable replacement. Other interesting alternatives to Kiro are Mistral Code, JetBrains Junie and Frontman-Agent.
Mellum-4b-base is JetBrains' first open-source large language model (LLM) optimized for code-related tasks.

Lightning-fast completions, deep code understanding, and agentic software engineering—right where you work.




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




Frontman is an AI Agent that lives in your browser, sees your live DOM, and turns your visual feedback into real changes - no more refresh-and-check cycles.

