opus_4_5_migration

Migrate prompts and code from older Claude versions to Opus 4.5.

43|11|Updated Dec 27, 2025

Search Tags:#prompt engineering #migration #claude #opus 4.5 #codebase update #api update

Ready to run

npx skills add https://github.com/vuralserhat86/antigravity-agentic-skills --skill opus-4-5-migration-vuralserhat86

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: opus_4_5_migration
Source: https://github.com/vuralserhat86/antigravity-agentic-skills/tree/main/skills/opus_4_5_migration
Command: npx skills add https://github.com/vuralserhat86/antigravity-agentic-skills --skill opus-4-5-migration-vuralserhat86

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill automates the process of updating codebases, prompts, and API calls to leverage the latest Claude Opus 4.5 model, ensuring compatibility and optimal performance.

Core Features & Use Cases

Model String Updates: Automatically replaces outdated model identifiers with the correct Opus 4.5 strings across different platforms (Anthropic API, AWS Bedrock, Google Vertex AI, Azure AI Foundry).
Prompt Adjustment: Modifies prompts to account for known behavioral differences in Opus 4.5, such as tool overtriggering, over-engineering, code exploration, and thinking sensitivity.
Beta Header Removal: Identifies and removes unsupported beta headers like context-1m-2025-08-07.
Use Case: A developer needs to migrate their existing Claude API integration from Sonnet 4.0 to Opus 4.5. This Skill will handle all necessary code and prompt modifications to ensure a smooth transition.

Quick Start

Use the opus_4_5_migration skill to update all model strings in the project to claude-opus-4-5-20251101.

Frequently Asked Questions about opus_4_5_migration

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

FAQPage Schema

How do I migrate Claude API calls from Sonnet 4.0 to Opus 4.5?▼

Migrating to Opus 4.5 requires replacing outdated model string identifiers with the correct Opus 4.5 strings across Anthropic API, AWS Bedrock, Google Vertex AI, and Azure AI Foundry integrations.

What behavioral prompt changes are needed for Claude Opus 4.5?▼

Prompts for Opus 4.5 need adjustments for known behavioral differences including tool overtriggering, over-engineering, code exploration tendencies, and thinking sensitivity to ensure optimal performance.

Does upgrading to Claude Opus 4.5 require removing beta headers?▼

Yes, upgrading to Opus 4.5 requires identifying and removing unsupported beta headers like context-1m-2025-08-07 from API requests to maintain compatibility.

How do I update AWS Bedrock model strings for Claude Opus 4.5?▼

Updating AWS Bedrock for Opus 4.5 involves replacing outdated Claude model identifiers with the correct Bedrock-specific Opus 4.5 strings within your existing codebase.

Can I use one migration process for Anthropic API, Google Vertex AI, and Azure AI Foundry?▼

Yes, a unified migration process can update model strings and adjust prompts across Anthropic API, Google Vertex AI, and Azure AI Foundry simultaneously for Opus 4.5 compatibility.

Why does Opus 4.5 overtrigger tools and how do I fix it in prompts?▼

Opus 4.5 exhibits tool overtriggering as a known behavioral difference; fixing it requires modifying existing prompts to adjust sensitivity and explicitly constrain tool usage contexts.