If it's fully open source, where's the code for training it? The implementation - at least, theirs - is also not trivial as they've mentioned optimising below the CUDA level to get maximum throughout out of their cluster.
I'm very appreciative of what they've done, but it's open weights and methodology, not open source.
https://github.com/deepseek-ai
More importantly, they spelled out their methodology in depth in a paper (the code/implementation is trivial in comparison to the methodology)