[FEATURE] Allow using Opus 4.6 model while 4.7 gets sorted out

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

Opus 4.7 is currently doing a significantly worse job on real coding tasks than Opus 4.6 did, even setting the effort level to max. It has been a real productivity killer.

Proposed Solution

At least for as long as Opus 4.7 is still not up to par, please re-enable setting Opus 4.6 as the model.

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

API and model interactions

Use Case Example

_No response_

Additional Context

_No response_