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teknium / Nous released Mistral finetunes (Hermes) that are quite great, and even published the datasets used for training.

But for the worldsim I think they are really using Claude (probably Haiku or Sonnet) via openrouter (https://openrouter.ai/).

Not the first as a 'concept', there was a MUD where you could create objects with as much as properties as you wished.

Why do you think they’re using their own weights?