Nothing in the article is open source. A proprietary model got leaked and there are other proprietary apps that are stupidly building on the leaked model.

OpenAssistant is an actually open source model, I'm using it now in preview and on April 15 they will release the full model. It's the closest to ChatGPT so far in my experience.

They also said they have no plans to release the dataset, so it's not reproduceable either.

It isn't.