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How to use Jan: what you can do with it

What is Jan? Jan is an open-source ChatGPT replacement that downloads and runs LLMs such as Llama, Gemma, Qwen and GPT-oss locally from Hugging Face, with full control and privacy. It can also connect to cloud models from OpenAI, Anthropic, Mistral, Groq and others, lets you create custom assistants, exposes an OpenAI-compatible API at localhost:1337 and supports the Model Context Protocol for agentic features.

How do I use it? Download Jan for your OS from Jan.ai or GitHub Releases: Jan.exe, Jan.dmg, Jan.deb or Jan.AppImage; then open Jan and download a model such as Llama, Gemma or Qwen from Hugging Face; pick a model size your RAM can handle, for example 3B on an 8GB Mac. Full steps below.

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What do you want to do?

3 use cases

Quick start with Jan

  1. Check you have what it needs: Windows 10+, macOS 13.6+ or most Linux distributions; RAM for the model size: 8GB for 3B models, 16GB for 7B, 32GB for 13B on macOS; To build from source: Node.js 20+, Yarn 4.5.3+, Make and Rust.
  2. Open janhq/jan on GitHub and read the README and license.
  3. Download Jan for your OS from Jan.ai or GitHub Releases: Jan.exe, Jan.dmg, Jan.deb or Jan.AppImage
  4. Open Jan and download a model such as Llama, Gemma or Qwen from Hugging Face
  5. Pick a model size your RAM can handle, for example 3B on an 8GB Mac
  6. Start chatting; everything runs locally when you choose a local model

These steps come from our top use case, Chat with an AI model fully offline, which also has a copy-paste agent prompt.

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About this repo

  • Who it is forPeople who want a private ChatGPT-style app on their own computer, and developers who want a local OpenAI-compatible endpoint.
  • Why it is hot45k stars, talked about in 2 AI sources we track
  • LanguageRust
  • Sourcegithub.com/janhq/jan ยท Back to Hot repos

Requirements

  • Windows 10+, macOS 13.6+ or most Linux distributions
  • RAM for the model size: 8GB for 3B models, 16GB for 7B, 32GB for 13B on macOS
  • To build from source: Node.js 20+, Yarn 4.5.3+, Make and Rust

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Questions about Jan

What is Jan?

Jan is an open-source ChatGPT replacement that downloads and runs LLMs such as Llama, Gemma, Qwen and GPT-oss locally from Hugging Face, with full control and privacy. It can also connect to cloud models from OpenAI, Anthropic, Mistral, Groq and others, lets you create custom assistants, exposes an OpenAI-compatible API at localhost:1337 and supports the Model Context Protocol for agentic features. It is an open-source project on GitHub: https://github.com/janhq/jan.

How do I use Jan?

Download Jan for your OS from Jan.ai or GitHub Releases: Jan.exe, Jan.dmg, Jan.deb or Jan.AppImage; then open Jan and download a model such as Llama, Gemma or Qwen from Hugging Face; pick a model size your RAM can handle, for example 3B on an 8GB Mac. The use cases on this page give the full steps and a copy-paste agent prompt for each job.

Who is Jan for?

People who want a private ChatGPT-style app on their own computer, and developers who want a local OpenAI-compatible endpoint.

What can I do with Jan?

3 use cases so far, for example: Chat with an AI model fully offline; Use Jan as a local OpenAI-compatible API; Build Jan from source with your GPU engine. Each has steps and a copy-paste agent prompt.

What do I need to run Jan?

Windows 10+, macOS 13.6+ or most Linux distributions; RAM for the model size: 8GB for 3B models, 16GB for 7B, 32GB for 13B on macOS; To build from source: Node.js 20+, Yarn 4.5.3+, Make and Rust.

What are alternatives to Jan?

Other hot AI repos in Personal productivity: Cindy, Textgen, Learnharness, Chatbox, Planning with Files.

Is Jan safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.