Is there a free open-source alternative to ChatGPT?

Yes. Jan, GPT4All, AnythingLLM, LobeChat, and LibreChat are all free and open source; costs only appear if you connect them to paid model APIs like OpenAI or Anthropic.

Can I self-host a ChatGPT alternative?

All five tools support self-hosting. Jan and GPT4All are designed to run entirely on your own device with no server needed; LibreChat and LobeChat are typically deployed via Docker.

Which open-source ChatGPT alternative works fully offline?

Jan and GPT4All are built for 100% offline use, running models locally through llama.cpp-based inference with no internet connection required.

Which open-source ChatGPT alternative is best for teams?

LibreChat supports multi-user authentication and connects to many model providers behind a single admin-managed instance, making it the most team-ready option here.

Can any of these chat with my own documents like ChatGPT's file upload?

AnythingLLM is purpose-built for retrieval-augmented generation over your own documents; LibreChat and LobeChat also support file and knowledge-base attachments.

7 Best Open Source ChatGPT Alternatives

A curated, ranked list of the best open-source ChatGPT alternatives, compared by GitHub stars, license, and self-hosting options.

The best open source alternative to ChatGPT is Open WebUI. If that doesn't suit you, we've compiled a ranked list of open source ChatGPT alternatives to help you find a replacement.

Written by Ege Beşe

Last updated: July 10, 2026

Open WebUI

A self-hosted, offline-capable AI platform with a chat interface, built-in RAG, plugin support, and connections to Ollama and OpenAI-compatible APIs.

LobeHub

LobeHub is an open source AI chat platform connecting multiple LLM providers, plugins, and agents in one self-hosted app.

GPT4All

GPT4All runs large language models locally on desktop and laptop hardware, without requiring API calls or a GPU.

AnythingLLM

AnythingLLM is a self-hosted AI app for chatting with your documents, running AI agents, and connecting to any LLM provider.

Jan

Jan is an open source, local-first ChatGPT alternative that runs LLMs on your own device with full privacy.

LibreChat

LibreChat is a self-hosted AI chat platform that unifies OpenAI, Anthropic, Google, and other providers in one UI.

QwenPaw

QwenPaw is an open-source, self-hosted AI assistant with persistent memory, sandboxed tool execution, and support for local or cloud LLMs.

Why choose an open-source ChatGPT alternative

Every message sent to ChatGPT passes through OpenAI's servers, which is a problem for teams handling client data, source code, or health records under contracts that restrict where that data can go. Open-source chat interfaces let you point at a local model running on your own hardware, or route requests through your own API keys to providers you choose, so conversation data stops leaving infrastructure you control.

Cost is the second reason. ChatGPT Plus and Team plans charge per seat regardless of usage. Self-hosted tools that connect to model APIs let you pay only for tokens actually consumed, and tools that run models locally remove the per-token cost entirely once the hardware is in place.

What to look for

Decide first whether you need local inference (no internet connection required, but limited to models your hardware can run) or a multi-provider chat UI (needs internet and API keys, but gives access to larger hosted models). Check hardware requirements: some local runners need a GPU, others are tuned to run acceptably on CPU alone. For teams, look for multi-user auth and role management, since single-user desktop apps don't handle shared deployments well. If document search matters, confirm the tool supports retrieval-augmented generation (RAG) rather than just chat.

How the top ChatGPT alternatives compare

Jan and GPT4All both run entirely offline: Jan uses a llama.cpp backend and exposes an OpenAI-compatible local API, while GPT4All is a desktop app built specifically to run local LLMs on ordinary consumer hardware without requiring a GPU. AnythingLLM is local-first too, but built around retrieval-augmented generation, so it is suited to teams that want to chat with their own documents rather than just converse with a model. LobeChat (from LobeHub) is a multi-model chat framework with a plugin and agent marketplace, aimed at running your own branded AI assistant rather than a single chatbot. LibreChat is the closest to a direct ChatGPT clone with more range: it connects to OpenAI, Anthropic, Azure, Google Vertex, Groq, and OpenRouter behind one interface, supports multi-user accounts with authentication, and includes a code interpreter and an artifacts feature similar to Claude's canvas.

Frequently asked questions

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The best open-source alternatives to ChatGPT, compared by local model support, self-hosting, and multi-provider chat.

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