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Sweep 28 Aug 2026 ยท 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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prompting-claude-opus-4-8

build-with-claude/prompt-engineering/prompting-claude-opus-4-8

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build-with-claude/prompt-engineering/prompting-claude-opus-4-8 Changed · +2 / -2 lines

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 description: Behavioral differences and prompting patterns for Claude Opus 4.8, covering verbosity, effort calibration, tool use, subagents, and frontend defaults.
 ---
 
-This guide covers the prompting patterns specific to Claude Opus 4.8. For the API changes involved in moving from Claude Opus 4.8 to the latest Opus model, see [Migrating to Claude Opus 5 from Claude Opus 4.8](https://platform.claude.com/docs/en/about-claude/models/migration-guide#migrating-from-claude-opus-4-8-to-claude-opus-5). For techniques that apply across all current Claude models, see [Prompting best practices](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/claude-prompting-best-practices).
+This guide covers the prompting patterns specific to Claude Opus 4.8. For the API changes involved in moving from Claude Opus 4.8 to the latest Opus model, see [Migrating to Claude Opus 5 from Claude Opus 4.8](https://platform.claude.com/docs/en/models/opus-5/migration-guide#migrating-from-claude-opus-4-8-to-claude-opus-5). For techniques that apply across all current Claude models, see [Prompting best practices](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/claude-prompting-best-practices).
 
 Claude Opus 4.8 has particular strengths in long-horizon agentic work, knowledge work, vision, and memory tasks. It performs well out of the box on existing Claude Opus 4.7 prompts. The following patterns cover the behaviors that most often require tuning.
 
 <Note>
-  For the API parameter changes since Claude Opus 4.7 (sampling parameters, effort default, 1M context window default, mid-conversation system messages, and refusal stop details), see [Migrating to Claude Opus 5 from Claude Opus 4.7](https://platform.claude.com/docs/en/about-claude/models/migration-guide#migrating-from-claude-opus-47), which covers the same changes on the way to the latest Opus model; Claude Opus 4.8 shares these behaviors.
+  For the API parameter changes since Claude Opus 4.7 (sampling parameters, effort default, 1M context window default, mid-conversation system messages, and refusal stop details), see [Migrating to Claude Opus 5 from Claude Opus 4.7](https://platform.claude.com/docs/en/models/opus-5/migration-guide#migrating-from-claude-opus-47), which covers the same changes on the way to the latest Opus model; Claude Opus 4.8 shares these behaviors.
 </Note>
 
 ## Response length and verbosity