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Jan
Image: official project repository

> GEM LOCAL AI · PRODUCTIVITY & DOCS

Jan

by Menlo Research (janhq)

An open-source ChatGPT alternative that runs 100% offline on your computer.

44.9 k stars GitHub Apache-2.0 FreeLocalOpen sourceOpen weights
View on GitHub →

What it does

  • One-click downloads of Hugging Face models
  • OpenAI-compatible local server (localhost:1337)
  • MCP integration and optional cloud API connections

Install it

Requirements: Windows, macOS or Linux.

Download
https://jan.ai/download

The prompt for your agent

Paste it into your coding agent: it checks the requirements and installs it for you.

Claude CodeCodexCursorGemini CLIopencode
Prompt
Install Jan (https://jan.ai) on my machine.
1. Check the requirements: Windows, macOS or Linux. If anything is missing, tell me before installing anything.
2. Follow the official method:
- see https://jan.ai/download
3. Check that it works, then explain how to launch it and where to start.

Always review what your agent is about to run, especially install commands.