I think Gemini 3.0 the model is smarter than Opus 4.5, but Claude Code still gives better results in practice than Gemini CLI. I assume this is because the model is only half the battle, and the rest is how good your harness and integration tooling are. But that also doesn't seem like a very deep moat, or something Google can't catch up on with focused attention, and I suspect by this time next year, or maybe even six months from now, they'll be about the same.

Claude is cranked to the max for coding and specifically agentic coding and even more specifically agentic coding using Claude Code. It's like the macbook of coding LLMs.

Claude Code + Opus 4.5 is an order of magnitude better than Gemini CLI + Gemini 3 Pro (at least, last time I tried it).

I don't know how much secret sauce is in CC vs the underlying model, but I would need a lot of convincing to even bother with Gemini CLI again.