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DeepSeek is the open-source disruptor of the chatbot market: reasoning, math and coding performance that trades blows with the paid frontier models, in an app and web experience with no paywall at all. Its open weights and famously cheap API made it the default budget choice for developers worldwide.
R-series models show their step-by-step thinking on hard problems.
No paywall on the app or web — the outlier among frontier chatbots.
Run it yourself or fine-tune it; the models are downloadable.
An order of magnitude cheaper than Western frontier APIs.
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