Is Claude "Code" anything special,or it's mostly the LLM and other CLIs (e.g. Copilot) also work?
In my experience the CLI tool is part of the secret sauce. I haven't tried switching models per each CLI tool though. I use claude exclusively at work and for personal projects I use claude, codex, gemini.
It’s mostly the model, Copilot, Claude Code, OpenCode, snake oil like Oh My OpenCode, it’s not huge differences.
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I've tried most of the CLI coding tools with the Claude models and I keep coming back to Claude Code. It hits a sweet spot of simple and capable, and right now I'd say it's the best from an "it just works" perspective.