Hi @Yash01Kumar12 

1) I think you're correct = Knowledge Assistant in Databricks does not allow you to select a different LLM from the UI

4) There is no dedicated pricing calculator for Genie as of now. Genie’s usage is typically billed as part of Databricks’ serverless or workspace compute, and LLM usage may incur additional costs.

Databricks Pricing: Flexible Plans for Data and AI Solutions | Databricks