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.
Install
npx skills add anthropics/claude-code --skill claude-opus-4-5-migrationnpx skills add anthropics/claude-code --skill claude-opus-4-5-migration -a claude-code -gnpx skills add anthropics/claude-code --skill claude-opus-4-5-migration -a codex -ggemini skills install https://github.com/anthropics/claude-code.git --path plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migrationgh skill install anthropics/claude-code claude-opus-4-5-migrationgit clone --depth 1 https://github.com/anthropics/claude-code /tmp/anthropics__claude-code
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/anthropics__claude-code/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration ~/.claude/skills/claude-opus-4-5-migration # Claude Code
cp -R /tmp/anthropics__claude-code/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration ~/.agents/skills/claude-opus-4-5-migration # Codex, Cursor, Gemini CLI, Copilot, OpenCode