> **claude-opus-4-5-migration** — chapter 1 of 10 in [anthropics/claude-code](https://skillsdocs.com/anthropics/claude-code).
>
> Book (all chapters, one file): https://skillsdocs.com/anthropics/claude-code.md
> Machine manifest: https://skillsdocs.com/anthropics/claude-code/.well-known/agent-skills/index.json
> Install the book: `npx skills add anthropics/claude-code`
> Upstream: https://github.com/anthropics/claude-code/blob/main/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration/SKILL.md @ `main`
> Raw bytes, no header: https://raw.githubusercontent.com/anthropics/claude-code/main/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration/SKILL.md
> Base for relative paths: https://raw.githubusercontent.com/anthropics/claude-code/main/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration/
> Licence: No licence detected — all rights reserved by its authors
>
> Bundled files (2), referenced from this skill's directory:
>   - `references/effort.md` — https://raw.githubusercontent.com/anthropics/claude-code/main/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration/references/effort.md
>   - `references/prompt-snippets.md` — https://raw.githubusercontent.com/anthropics/claude-code/main/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration/references/prompt-snippets.md
>
> Content © its authors. This chapter's body is not served here; the links above are. Takedown: https://github.com/kyleledbetter/skillsdocs/issues/new?labels=takedown&title=Takedown+request

# claude-opus-4-5-migration

Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5. Use when the user wants to update their codebase, prompts, or API calls to use Opus 4.5. Handles model string updates and prompt adjustments for known Opus 4.5 behavioral differences. Does NOT migrate Haiku 4.5.

No licence could be detected for this skill at either the repository or the skill level, so its body is not reproduced here. Read it upstream:

https://raw.githubusercontent.com/anthropics/claude-code/main/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration/SKILL.md