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10 best open source ChatGPT alternative that runs 100% locally

Emmanuel Mumba on June 19, 2025

AI chatbots have taken the world by storm—and leading the charge is OpenAI’s ChatGPT. But as powerful as it is, ChatGPT comes with limitations: it ...
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Lynn Mikami

That's a good one, Emmanuel! Nice to know local-run, privacy-first LLM chatbots!

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Emmanuel Mumba

You’re welcome. Glad you like the list.

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Klaudia Kováčová

Ollama is my favourite! I use it with Open WebUI

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Emmanuel Mumba

Oh yeah. Ollama is really a good one

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Helena Figueiredo Costa

Another cool list, thx Emmanuel!

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Emmanuel Mumba

You’re welcome.

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Ananya Balehithlu

Awesome list! I learned a lot of tools from your articles. Thank you.

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Dotallio

Absolutely loving how many solid local LLM options have popped up lately - offline control is a game changer for privacy. Which of these tools has been the most stable for you in daily use?

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Emmanuel Mumba

I would go for Ollama any day.

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Chrisywz • Edited

If you're looking to build an internal, chat-based knowledge base with AI agents on top of your own data, I can also recommend Enthusiast.

It says it's for e-commerce but it's suitable to any knowledge-heavy use case where you need private, RAG-powered automation.

Curious to hear if anyone else here is building with RAG + agents. Happy to exchange ideas.

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krisha sharma

If you want something solid but not too complicated, GPT-NeoX is a great pick. It's powerful, open-source, and gets you a lot of what ChatGPT offers, all running right on your machine. But if you’re after something a little lighter, GPT-J is a nice alternative. It’s also open-source and doesn’t require a super beefy setup to work well.

At the end of the day, it really comes down to what your system can handle and what you need. These models each have their sweet spots, so it’s all about finding the one that fits your project.

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Walter Diane

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Nathan John

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Dan Stoneham

Msty deserves a shout (msty.app). Great UI, lots of features. Can run models locally or use a remote model provider

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Vibs Qwerty

Sadly all of them don't work on Linux!!!

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Ilya Kashnitsky

Wrong. Ollama, Jan, LMstudio, AnythingLLM. This issue of soft availability on Linux really does not exist anymore

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emwadde

Which of these has best support for MCP protocol

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RK

You forgot ChatRTX by Nvidia

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Eva Clari

A great list 🔥 ,@therealmrmumba any LLM's ideal for content creation

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Latchu@DevOps

Awesome

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Prj Hid

Should've included the hardware requirements running these and tested it

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Syed Muhammad Ali Raza

Good one

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andry92i

It's good, I think ollama.com is easy to install

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rytis

Perfect article!

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Agnes Lizzy

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siddiqui

Great list! Running AI models locally is a game-changer for privacy and control. Definitely trying a few of these!