Claude Code v2.1.280+ lets you switch Opus 5.5 effort mid-session without breaking prompt cache
kimmonismus · x · 2026-09-23
- Switching effort mid-session on Opus 5.5 no longer breaks your prompt cache, per @lydiahallie.
- The catch: you must be on Claude Code v2.1.280 or later.
- Practical win for heavy coding-agent users: adjusting effort no longer costs you cache hits (and money).
Related event: Claude Code update keeps prompt cache intact when switching effort(3 posts)→
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