Open-weight models let you run an AI chatbot on your own computer, even offline. Here’s how they work and what that means for your privacy.
You might use a chatbot without thinking about who controls the model behind it. Then an update changes how it answers, or you want help with something private you’d rather keep on your computer.
An open-weight model lets you download the pretrained AI and run it yourself. You’ll need software to use it and a computer that can handle it, but you get to keep a working copy. While chatbots get most of the attention, image and video generators can also have open-weight options.
Downloading an AI model doesn’t necessarily give you unrestricted permission or reveal everything that went into making it, though. Sure, you get more autonomy in how you use AI, but the word “open” still leaves a lot unsaid. Here’s what open-weight models are, what you can do with them and what to consider before trying one for yourself.
In a chatbot, the AI model is the software that generates the answers. During training, the model learns patterns by adjusting billions of numerical values called neural network weights. When you ask a question, the model uses your prompt and those learned patterns to predict what text should come next, building its answer one piece at a time.
Developers of closed models, including those behind ChatGPT and Claude , keep their weights private. An open-weight model makes its trained weights publicly available.
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