Main advantage over Sonnet is Gemini 2.5 doesn't try to make a bunch of unrelated changes like it's rewriting my project from scratch.
If I'm using Claude through Copilot where it's "free" I'll let it do its thing and just roll back to the last commit if it gets too ambitious. If I really want it to stay on track I'll explicitly tell it in the prompt to focus only on what I've asked, and that seems to work.
And just today, I found myself leaving a comment like this: //Note to Claude: Do not refactor the below. It's ugly, but it's supposed to be that way.
Never thought I'd see the day I was leaving comments for my AI agent coworker.
Now they just need a decent usage dashboard that doesn’t take a day to populate or require additional GCP monitoring services to break out the model usage.