Use /model opusplan

/model opusplan uses Opus for planning and Sonnet for implementation.

/model opusplan

Why it is useful

• Opus is stronger for planning, architecture, debugging strategy, and complex reasoning.
• Sonnet is usually faster and more cost-effective for implementation.
• The workflow gives you a stronger plan first, then efficient execution.

Typical workflow

1. Run /model opusplan.
2. Enter Plan Mode.
3. Let Opus create the plan.
4. Approve the plan.
5. Claude Code uses Sonnet for implementation.

For very large context work, /model opusplan[1m] may be useful when 1M context is available and needed.