I solely use Replit Core with Claude 3.5 Sonnet as the main model.

I primarily use the assistant as a way to refactor code and help parse and fix error messages. The agent is great for quickly getting a UI and base foundation out for a new and simple app, but with context specific and more advanced requests, it can be a bit lackluster. The assistant picks up the slack where the agent lacks, however, since it has full context on the codebase and essentially performs the same functions as the agent (just on an existing project rather than from scratch).