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 a

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/ https://openrouter.ai/).