Do you know about opusplan in Claude Code?

If you type /model, it won’t show up. You have to type /model opusplan directly. It’s a hidden option — Opus for plan mode, Sonnet for everything else.

The idea is simple: planning needs the smarter model, execution doesn’t. When you enter plan mode (Shift+Tab), Opus does the thinking. Once the plan is set and you start implementing, it switches to Sonnet automatically.

This makes a lot of sense to me. A good plan is 80% of the work. If Opus nails the architecture and breaks things down correctly, Sonnet can follow through just fine. You don’t need the most expensive model to write boilerplate or apply a well-defined diff.

/model opusplan. Try it.