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

Mellum vs GitHub Copilot Comments

- Mellum is Free and Open Source
GitHub Copilot is not available as a self-hosted solution but there are some alternatives for power users and business that want to host a solution on-premise. The best Self-Hosted alternative is Mellum, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to GitHub Copilot and ten of them are available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting Self-Hosted alternatives to GitHub Copilot are TabbyML, CodeGeeX, Nut Chat and Sweep.
Mellum-4b-base is JetBrains' first open-source large language model (LLM) optimized for code-related tasks.


Tabby is an open-source, self-hosted AI coding assistant. With Tabby, every team can set up its own LLM-powered code completion server with ease.



CodeGeeX is an AI-based coding assistant, which can suggest code in the current or following lines. It is powered by a large-scale multilingual code generation model with 13 billion parameters, pretrained on a large code corpus of more than 20 programming languages.



Works like copilot, and it's free now. Nice to see a new extension that can compete with copilot.


Open source tool centered on AI-driven full stack app development, Nut generates bug analysis via Replay.io recordings and runtime behavior capturing, offering AI developers explanations for effective resolutions. Early adopters enjoy free access for feedback contributions.


Sweep is an AI junior developer that turns bugs and feature requests into code changes. Sweep automatically handles devex improvements like adding typehints/improving test coverage. 🤖


Plandex uses long-running agents to complete tasks that span multiple files and require many steps. It breaks up large tasks into smaller subtasks, then implements each one, continuing until it finishes the job.

One API for plugins and datasets, one interface for prompt engineering and visual operation, all for creating powerful AI applications.




bolt.diy, the official open source version of Bolt.new (previously known as oTToDev and bolt.new ANY LLM), which allows you to choose the LLM that you use for each prompt!.

Self-hosted & federated platform for AI IDE/Tools Rules and Commands via WebUI & CLI - Generate, browse, store, share AGENTS.md, CLAUDE.md, and more.

A new family of code large language models (LLMs) designed to advance autonomous software engineering and code intelligence.
Mellum is a language model, Copilot is a CLI and AI service