I tried gemini2.5 and while it is certainly a very strong model you really notice that it was not trained to be 'agentic'/with strong initiative for tool calling. Oftentimes it would make a plan, I'd say 'go ahead' and it just replied something like 'I made a todo list we are ready to implement' or something similar lol. You really had to push it to action and the whole CC experience fell apart a bit.