At the moment, we're using Claude 3.7 Sonnet, but we're keeping our options open to change the model down the line, and potentially even to introduce a model picker like we have for Copilot Chat and Agent Mode.

Using different models for different tasks is extremely useful and I couldn't imagine going back to using just one model for everything. Sometimes a model will struggle for one reason or another and swapping it out for another model mid-conversation in LibreChat will get me better results.