I used the anthropic api workbench which also has a chat UI and is dirt cheap
Discussion
Why is it dirt cheap? Is it not using sonnet? Or is it using sonnet more efficiently than CLINE does perhaps? Or perhaps Anthropic is subsidizing the cost to make it cheaper than is available through their raw API?
Not sure about the exact cost but the workbench seemed pretty cheap to me. I loaded ~5$ which lasted for a long time with sonnet. You can try it very easy with an anthropic account.