Let's get straight to it. Unfortunately, there's no way to run ChatGPT locally. ChatGPT is a proprietary service by OpenAI: they don't publish their code on GitHub, and it's essentially kept secret.
The good news: there are ChatGPT-like open-source AI models and services that offer a great alternative to OpenAI's chatbot, giving you essentially the same user experience — for free.
In this guide, we'll show you how to set up your own offline ChatGPT alternative and start chatting in about 5 minutes.
No. ChatGPT is a cloud product built and operated by OpenAI.
Are OpenAI desktop and mobile apps local?
No — the ChatGPT desktop and mobile apps might feel like local software, but they don't work without an internet connection, and every message you type gets sent to OpenAI servers. In other words, these are cloud AI apps with a locally installed interface, but the actual processing of your information happens remotely in OpenAI datacenters.
Are OpenAI GPT-OSS models local?
Yes. In fact, GPT-OSS is the closest thing OpenAI offers to an offline ChatGPT, but these models are not the same as ChatGPT — they don't have the user-facing interface and features that ChatGPT, the online chat software, has. You still can't download ChatGPT itself and run it on your laptop.
Can you use ChatGPT offline?
The definitive answer is no. But what you can do is run open-source models from Meta (Llama), Google (Gemma), Alibaba (Qwen), Microsoft (Phi), and even OpenAI completely offline, and create your own offline ChatGPT experience that's practically identical.
Local AI Benefits and Limitations
Before you set anything up, here's an honest look at what a local model offers compared to the online ChatGPT experience — and what it doesn't — because there are both pros and cons to offline AI systems:
Local AI benefits
Privacy. Your data stays on your machine — nobody can read your chats.
Offline access. Once the model is downloaded, it runs without the internet.
Completely free. There's no subscription — you can chat with AI all day without paying a cent.
Customization. You choose the model, the parameters, and the system prompt. You can swap models in seconds, fine-tune them on your own data, or run multiple models side by side.
Local AI limitations
Not as powerful as ChatGPT. Frontier cloud models like GPT-4.5 outperform local models on hard tasks, because they have access to compute that no consumer hardware can match.
Multimodal features. Image generation, advanced vision, and file analysis are more polished in ChatGPT. Local multimodal support exists, but it's not as powerful yet.
Local AI requires decent hardware. The smarter the model you want to run, the more RAM and GPU power you need. An 8 GB laptop can handle small models, but the really capable ones need 16–32 GB or more.
How to Run Your Own ChatGPT-like Chatbot Locally in 5 Minutes
Here's how to set up a capable open-source ChatGPT alternative on your own machine. It takes just three steps.
Step 1: Download a Local AI App
To run an AI model on your machine, you need an app.
That's because AI models themselves — the part of the software that processes your questions and generates human-like answers — are just raw files: massive collections of numerical weights that don't do anything on their own.
You need a piece of software that loads the model into memory, runs the inference on your hardware, and gives you an interface to interact with it. That's what local AI apps do.
If this concept still feels a bit foreign, a good way to think about it is like playing an MP3 file — you need a music player to play the song. Same idea here — you need an app that knows how to "play" the model.
There are many local AI apps today, but the simplest option to get started with is Atomic Chat. To use it:
Download the Mac installer from atomic.chat
Drag the icon to your Applications folder
Double-click the icon
You're done.
From here, the app walks you through picking and downloading a model during onboarding.
Other popular choices include LM Studio, Ollama, and Jan.
Step 2: Pick a Model
If you've installed your local AI app of choice, you're now ready to run a model — and the first step is to download it to your machine.
Open the app and follow the on-screen setup instructions — it will guide you to the model selection screen as part of the first-launch configuration.
Just like with apps, there are many model providers to choose from, but if you want an experience closest to ChatGPT, pick GPT-OSS models — these are official open-weight models from OpenAI and the closest you'll get to ChatGPT.
gpt-oss-20b — 21B total params, MoE, only 3.6B active per token. Runs on 16 GB RAM. Matches o3-mini on benchmarks.
gpt-oss-120b — 117B total, 5.1B active. Near o4-mini quality. Needs an H100 80 GB though — not consumer hardware.
Both were released in 2025, feature full chain-of-thought capabilities, and offer a 128k context window.
Step 3: Start Chatting
Once you've chosen your model, simply click download and it will save to your hard drive — this can take a while, as model files are rather large: remember, you're downloading the entire "knowledge" of the model to your local system.
Once the download finishes, you've successfully set up a local AI chatbot that looks and feels very much like ChatGPT — except it's fully private and works offline wherever you are.
You can now run ChatGPT alternative locally.
FAQ
Can you run ChatGPT locally?
No — ChatGPT is a proprietary cloud service owned by OpenAI. But you can you run ChatGPT-like AI chatbot locally by using open-source models from OpenAI (the GPT-OSS family) paired with a local AI app like Atomic Chat.
Is there an official offline ChatGPT chatbot?
No. The ChatGPT desktop app still requires an active internet connection — there's no true offline mode. OpenAI released GPT-OSS as open-source models, but those are separate products, not ChatGPT — they don't come with ChatGPT's interface or features.
Do I need a powerful computer for local AI?
Relatively, but you don't need a beast gaming PC. In practical terms, you need at least 8 GB of RAM to run the smallest capable models — the ones with ~3.8B parameters. With 16 GB, you can run models like Llama 4 8B that handle most tasks well. Macs with Apple Silicon are particularly good for this — their unified memory architecture means a MacBook Pro with 32 GB can run models that would require an expensive dedicated GPU on a PC.
Is offline AI free?
Yes — it's 100% free. All the software you need to run local AI — the chat interface and the models themselves — is open-source, and many projects are released under permissive licenses like Apache 2.0 or MIT. Since everything runs on your machine, the only thing you pay for is electricity.
Run Your Own Private ChatGPT Today
You can't run the real ChatGPT offline — but in 2026, you have access to open-source alternatives that deliver a ChatGPT-like experience for free. Download Atomic Chat and start chatting with your own private AI in minutes. It's the fastest way to run ChatGPT locally — without actually needing ChatGPT.
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