How can you optimize prompts when migrating from Opus 4.8 to Opus 5?

Start by testing existing Opus 4.8 prompts as-is, since Anthropic reports Opus 5 performs well out of the box on them - this isn't a full prompt rewrite, but a targeted tuning pass on a specific, known set of behaviors.

Add an explicit conciseness instruction if your product depends on a particular response length or verbosity, since Opus 5's default responses run longer and effort doesn't reliably control that - something like asking for focused, concise answers with minimal caveats, spending most of the response on the main point.

Remove blanket "double-check your work" verification instructions to avoid over-verification, and instead scope any remaining verification instruction to the specific steps that genuinely warrant it.

For agentic workflows, add explicit guidance on narration cadence - one sentence before the first tool call, brief updates only on meaningful changes, and a final message leading with the outcome - and review subagent delegation logic against Opus 5's more willing delegation behavior, since orchestration tuned for Opus 4.8's patterns may behave differently now.