The documentation currently says that the Expert Assistant uses the "best available LLM (claude-2)". I believe that the Expert Assistant does still use the Claude 2 model, but this is no longer the best available LLM.
Either the model for the Expert Assistant should be upgraded to the latest model, or if using a better language model does not make sense due to cost, the documentation should be updated to simply say that the Expert Assistant uses Claude 2, without calling it the "best available LLM".