Pax is just what I call the agent inside of Blackbear. It's a model agnostic harness, e.g. you can use Claude (Fable, Opus, Sonnet, Haiku), GPT 5.6, or Qwen to provide the inference.

The harness gives the model a set of tools and guidance for working within Blackbear, so Pax regardless of the model you supply can help you write notes, manage a spreadsheet, organize your space, etc.