Most turns in a Claude Code session are routine: reading files, running tests. The advisor lets a cheaper main model do those and ask a stronger model for advice at the moments that decide the outcome.
Step 1: pick a main model and an advisor
- Switch your main model to Sonnet with /model.
- Run /advisor opus. Claude Code confirms with 'Advisor set to' and saves it as your default.
- Or set it for one session only: claude --advisor opus. To save it in settings, add "advisorModel": "opus".
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