claude-opus-4-5-migration

Migrate prompts and code from Claude Sonnet 4.0, 4.5, or Opus 4.1 to Opus 4.5.

141|16|Updated Dec 20, 2025

Search Tags:#migration #prompts #claude-code #opus-4-5 #model-strings #op-4-5

One-click install

npx skills add https://github.com/jwynia/agent-skills --skill claude-opus-4-5-migration-jwynia

Or copy as Structured Prompt for Agent▼

Please help me install this Agent Skill.
Skill: claude-opus-4-5-migration
Source: https://github.com/jwynia/agent-skills/tree/main/collections/official-claude-code/claude-opus-4-5-migration/skills/claude-opus-4-5-migration
Command: npx skills add https://github.com/jwynia/agent-skills --skill claude-opus-4-5-migration-jwynia

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires @modelcontextprotocol/sdk, and includes references (resource) components.

What problem does it solve?

Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5. This Skill is used when the user wants to update their codebase, prompts, or API calls to leverage Opus 4.5. It handles model string updates and prompt adjustments for known Opus 4.5 behavioral differences. Does NOT migrate Haiku 4.5.

Core Features & Use Cases

Update model strings across platforms (Anthropic API, AWS Bedrock, Google Vertex AI, Azure AI Foundry)
Replace source model strings (Sonnet 4.0/4.5, Opus 4.1) with Opus 4.5 equivalents
Remove unsupported beta headers and document changes
Apply Opus 4.5 prompt adjustments when explicitly requested
Provide migration guidance and references to beta behavior considerations

Quick Start

Scan your repository for old model strings and update them to Opus 4.5 using the workflow described in the migration guide.