I love Claude 3.5 sonnet and their UI is top notch especially for coding, recently though they have been facing capacity issues especially during weekdays correlating with working hours. Have tried Qwen2.5 coder 32B and it's very good and close to Claude 3.5 in my coding cases.
This is what annoys me a lot, too. I mean the fact that I cannot have paste retain the formatting (```, `, etc.). Same with the UI retaining my prompt, but not the formatting, so if you do some formatting and reload, you will lose that formatting.