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

The best Large Language Model (LLM) alternative to Claude Code is Mellum, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Claude Code and 14 are Large Language Model (LLM) Tools so hopefully you can find a suitable replacement. Other interesting Large Language Model (LLM) Tool alternatives to Claude Code are OpenHands, Rivet AI, Osaurus and Dify - LLMOps Platform.
Mellum-4b-base is JetBrains' first open-source large language model (LLM) optimized for code-related tasks.

OpenHands is an open-source project aiming to replicate Devin, an autonomous AI software engineer who is capable of executing complex engineering tasks and collaborating actively with users on software development projects.




Visual AI programming platform with a graphical interface for creating, editing, and debugging LLM agent workflows, supporting real-time collaboration, YAML-based version control, open-source TypeScript library integration, and scalable deployment in production environments.

AI edge infrastructure for macOS. Run local or cloud models, share tools across apps via MCP, and power AI workflows with a native, always-on runtime.

Streamlines AI application development by combining plugin and dataset integration, a unified API, visual orchestration, analytics, annotation tools, prompt engineering support, backend-as-a-service capabilities, and compatibility with multiple modern LLMs.




Qwen Code is an AI-powered command-line workflow tool designed for developers, adapted from Gemini CLI and optimized for Qwen3-Coder models.


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Terminal-native open-source AI coding assistant for Mac, Windows, Linux, and BSD, featuring cross-session memory, reading and writing code, Git management, command execution, built-in MiMo Auto for zero configuration start, and integration with mainstream LLM provider APIs.




Your Personalized AI Development Assistant and Workflow Copilot.




Ollie is a sovereign creative suite designed for developers, writers, and creators who want the power of AI without sacrificing privacy or paying monthly subscriptions. It is a unified engine that runs local AI models entirely offline on your own hardware, ensuring complete data...



AgentOne is an AI agent built to help you get work done across your apps from start to finish. Tell it what you need in plain language, and it can carry out multi-step tasks on its own using the right tools and context from your connected services.



Azent is an AI coding agent that lives inside Azure DevOps, letting you trigger it from work items and pull requests to implement features, fix bugs, review PRs, address review comments and basically anything else — all without leaving the browser.



