They support Claude, ChatGPT, Gemini, HuggingChat, and Mistral.
I think Mistral is model-available (ie I’m not sure if they release training data/code but they do release model shape and weights), huggingchat definitely is open source and model-available
Sorry but HuggingChat / HuggingFace and all models on it are not open source (Edit: Oh you meant the UI HuggingChat is Open Source. Yeah sorry, I was focused on the models. And there is no Open Source model from my understanding.) -> https://opensource.org/ai/open-source-ai-definition Off course opensource.org is not the only authority on what the word opensource means, but its not a bad start.