prompting-claude-opus-5-5 changedbuild-with-claude/prompt-engineering/prompting-claude-opus-5-5
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4343* Reserve `xhigh` and `max` for work where you've measured a quality gain.
4444* To get less thinking, lower the effort level first. Lowering effort reduces thinking, and with it cost and latency, more reliably than prompt instructions do.
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46Changing the top-level `effort` value between requests invalidates the prompt cache. To run individual turns at a different level, use a [per-message effort change](https://platform.claude.com/docs/en/build-with-claude/effort#change-effort-mid-conversation-beta) (beta) instead, which keeps the cache.
46Changing the top-level `effort` value between requests invalidates the prompt cache. To change the level partway through a conversation, use a [per-message effort change](https://platform.claude.com/docs/en/build-with-claude/effort#change-effort-mid-conversation-beta) (beta) instead, which keeps the cache. A change holds for every later turn until another one replaces it.
4747
4848## Prompts written for thinking disabled
4949
No line in this hunk matches that.