[FEATURE] Using Opus for Thinking AND using Sonnet 4.5 1M for doing

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I often find myself wanting to use the Opus model to help me come up with the comprehensive thinking in plan mode. But then as soon as I agree with the plan, I want to use Sonnet 4.5, 1 million token for the implementation. That way I choose the best of both worlds.

Proposed Solution

I would like to be able to choose when I use the command /model to choose Opus for planning and then Sonnet 1 million token for implementation.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Performance and speed

Use Case Example

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Additional Context

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