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claude-opus-4-5-migration

Migrate Claude API usage from Sonnet 4.x or Opus 4.1 to Opus 4.5.

3|Updated Dec 14, 2025
Search Tags:#claude#migrate#opus-4-5#prompt-engineering#model-strings#api-compatibility#beta-headers
One-click install
npx skills add https://github.com/Delqhi-Projects/ZOE-Solar-Accounting-OCR --skill claude-opus-4-5-migration-delqhi-projects
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: claude-opus-4-5-migration
Source: https://github.com/Delqhi-Projects/ZOE-Solar-Accounting-OCR/tree/main/.claude/PLUGINS/marketplaces/claude-code-plugins/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration
Command: npx skills add https://github.com/Delqhi-Projects/ZOE-Solar-Accounting-OCR --skill claude-opus-4-5-migration-delqhi-projects

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Migrates prompts and API usage from Claude Sonnet 4.x, Sonnet 4.5, or Opus 4.1 to Opus 4.5, ensuring compatibility and reducing manual rewrite work.

Core Features & Use Cases

  • Model string updates: automatically map old model identifiers to Opus 4.5 equivalents across Anthropic API, AWS Bedrock, Vertex AI, and Azure Foundry.
  • Beta header handling: identify and remove unsupported beta headers to avoid runtime errors.
  • Effort parameter integration: apply the recommended "high" effort setting to enable optimal performance.
  • Guided prompt adjustments: provide structured snippets and references to align prompts with Opus 4.5 behavior for predictable results.
  • Use Case: teams migrating a large codebase with multiple integrations can run a unified migration pass to update models, headers, and prompts with minimal manual edits.

Quick Start

Migrate your project to Opus 4.5 by updating all model strings and adjusting prompts for Opus 4.5 compatibility.

Frequently Asked Questions about claude-opus-4-5-migration

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I migrate my API calls from Sonnet 4.5 to Opus 4.5?▼

Migrating to Opus 4.5 requires updating model strings, removing unsupported beta headers, and applying the high effort parameter for optimal prompt behavior alignment across platforms.

What model strings should I use for Opus 4.5 on AWS Bedrock and Vertex AI?▼

Opus 4.5 migration maps old model identifiers to platform-specific equivalents across Anthropic API, AWS Bedrock, Google Vertex AI, and Azure AI Foundry to ensure full API compatibility.

Do I need to remove beta headers when upgrading to Opus 4.5?▼

Yes, upgrading to Opus 4.5 requires identifying and removing unsupported beta headers from your API calls to prevent runtime errors and ensure stable prompt execution.

What is the effort parameter and how does it affect Opus 4.5 prompt engineering?▼

The effort parameter controls processing depth in Opus 4.5 migration, and applying the recommended high effort setting enables optimal performance and predictable prompt behavior results.

Can I migrate a large codebase with multiple integrations to Opus 4.5 in one pass?▼

Yes, teams can run a unified migration pass to update models, headers, and prompts across multiple platforms simultaneously, reducing manual rewrite work for large codebases.

Why are my prompts behaving differently after switching to Claude Opus 4.5?▼

Prompt behavior changes occur because Opus 4.5 has different alignment requirements, and structured prompt adjustments using guided snippets and references are needed to achieve predictable results.

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