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Not sure if this has been shared already, but AllenAI / Ai2 is a US-based nonprofit who are trying to build AIs as open-source and transparently as possible.

Their OLMO models have fully transparent training data. Their Tulu ones are as transparent as you can be building on top of Llama. Earlier this week, they released their new 405B Parameter Tulu model for free online chat and download.

Chat: https://playground.allenai.org/

HuggingFace: https://huggingface.co/allenai/Llama-3.1-Tulu-3-405B