Is DeepSeek Free and Open-Source?

Open Weights and Free Hosted Access, With Some Nuance

DeepSeek has released a number of its large language models with open weights, meaning the trained model parameters are made publicly downloadable, letting developers run the models on their own infrastructure without paying a licensing fee, subject to the specific license terms attached to each release. Alongside this, DeepSeek has also offered a hosted chatbot product that includes free access, giving everyday users a way to interact with its AI directly through a chat interface without needing any technical setup.

This combination — open-weight downloads for developers plus a free hosted chat experience for general users — mirrors the pattern followed by several other AI labs that maintain both a developer-facing open release and a consumer-facing product.

Why “Open-Weight” Isn’t Quite the Same as “Open-Source”

It’s worth being precise about terminology here, since the words “free” and “open-source” get applied loosely to AI models in ways that can be misleading. DeepSeek’s open-weight releases share the trained model parameters, which is enough for developers to run and often fine-tune the model themselves. However, this is generally distinct from fully open-source software in the traditional sense, which would typically include the complete training data and the full training pipeline used to build the model from scratch. DeepSeek’s open releases, like those of other AI labs following a similar approach, tend to stop short of that complete transparency, even though they still represent meaningfully more openness than a fully closed, API-only model.

This distinction matters for anyone trying to fully audit exactly how a DeepSeek model was built and trained, as opposed to someone who simply wants to use or adapt the model for their own application, for whom the open weights alone are generally sufficient.

What to Check Before Relying on “Free” Access

As with any AI provider offering both open-weight downloads and a free hosted product, the specific license terms attached to a given DeepSeek model, and any usage limits on its free hosted chatbot, are the kind of details that can change between releases and over time. Anyone planning to use DeepSeek’s models — whether by downloading them or through the hosted chat product — should check the current terms directly rather than assuming they match an earlier release or general expectations based on other AI companies’ practices.

Bottom Line

DeepSeek offers open-weight models that are free to download and run under their attached license terms, plus a free hosted chatbot experience, though like other open-weight releases, this falls short of the complete transparency of fully open-source software.

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