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claude-opus-4-5-migration

Update Claude model strings and remove unsupported beta headers for Opus 4.5 migration.

11|2|Updated Mar 31, 2026
Search Tags:#claude#opus-4-5#prompt-engineering#model-migration#codebase-update#api-update
One-click install
npx skills add https://github.com/ajsai47/holyclaude --skill claude-opus-4-5-migration-ajsai47
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: claude-opus-4-5-migration
Source: https://github.com/ajsai47/holyclaude/tree/main/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration
Command: npx skills add https://github.com/ajsai47/holyclaude --skill claude-opus-4-5-migration-ajsai47

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Migrating codebases, prompts, and API calls from older Claude models (Sonnet 4.0, Sonnet 4.5, Opus 4.1) to Opus 4.5 is manual and error-prone, requiring knowledge of updated model strings, removed beta headers, and new behavioral quirks of the latest model.

Core Features & Use Cases

  • Cross-Platform Model String Updates: Automatically replaces outdated model strings for Anthropic API, AWS Bedrock, Google Vertex AI, and Azure AI Foundry with the correct Opus 4.5 identifiers.
  • Unsupported Header Cleanup: Removes the deprecated context-1m-2025-08-07 beta header that is incompatible with Opus 4.5.
  • Optional Prompt Adjustments: Applies targeted fixes for known Opus 4.5 behavioral issues (overtriggering, over-engineering, generic frontend outputs, etc.) only when you report specific problems.
  • Use Case: A development team can use this skill to update 100+ API call references from Sonnet 4.5 to Opus 4.5 across their entire codebase in minutes, without manual find-and-replace errors.

Quick Start

Use the claude-opus-4-5-migration skill to update all model strings in your project from Sonnet 4.5 to Opus 4.5 and remove any unsupported beta headers.

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 API calls from Sonnet 4.5 to Opus 4.5?▼

Migrating API calls from Sonnet 4.5 to Opus 4.5 requires replacing outdated model strings with correct Opus 4.5 identifiers and removing unsupported beta headers like `context-1m-2025-08-07` across your codebase.

What needs to change when updating Claude model references for Opus 4.5?▼

Updating Claude model references for Opus 4.5 involves replacing old model strings, removing the incompatible `context-1m-2025-08-07` beta header, and configuring the new effort parameter for behavioral compatibility.

Does the Opus 4.5 migration process support AWS Bedrock and Google Vertex AI?▼

Yes, the Opus 4.5 migration supports AWS Bedrock and Google Vertex AI, automatically updating model strings for Anthropic API, Azure AI Foundry, and these cross-platform environments.

Why does Opus 4.5 require prompt engineering adjustments after model migration?▼

Opus 4.5 requires prompt engineering adjustments to fix known behavioral issues like overtriggering, over-engineering, and generic frontend outputs that emerge after migrating from older Claude models.

What are the limitations when migrating to Claude Opus 4.5?▼

A key limitation when migrating to Claude Opus 4.5 is the incompatibility with the `context-1m-2025-08-07` beta header, which must be removed to prevent API errors and ensure proper model function.

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