Which models can it migrate from?

It migrates from Sonnet 4.x and Opus 4.1 to Claude Opus 4.5.

Does it change prompts as well as code?

Yes, it updates both code and prompts so they work with Opus 4.5.

claude-opus-4-5-migration

PackAI & models

A plugin for AI agents that handles migration from Sonnet 4.x and Opus 4.1 to Claude Opus 4.5. It updates the agent's code and prompts so they work with the newer model instead of older ones.

Unavailable. Delivery for this kind is on the roadmap — not serving yet.

Have an agent setup that currently uses Sonnet 4.x or Opus 4.1.

What your AI can do with it

Migrates code from Sonnet 4.x to Opus 4.5
Migrates code from Opus 4.1 to Opus 4.5
Updates prompts to work with Opus 4.5

Getting started

Have an agent setup that currently uses Sonnet 4.x or Opus 4.1.
Add the claude-opus-4-5-migration plugin to your agent.
Ask the agent to migrate its code and prompts to Opus 4.5.

Signals

GitHub stars: 148k
Forks: 25k
Last commit: Sep 2026

Questions

Which models can it migrate from?: It migrates from Sonnet 4.x and Opus 4.1 to Claude Opus 4.5.
Does it change prompts as well as code?: Yes, it updates both code and prompts so they work with Opus 4.5.

Advanced

Item type: plugin
Key: anthropics-claude-code-claude-opus-4-5-migration
Source: github.com/anthropics/claude-code

github.com/anthropics/claude-code