---
title: Migration guides
url: https://platform.claude.com/docs/en/about-claude/models/migration-guide
description: Guides for migrating to the latest Claude models from previous Claude versions
---

* [Claude Fable 5.1 and Claude Mythos 5.1 migration guide](https://platform.claude.com/docs/en/models/fable-5-1/migration-guide)
* [Claude Opus 5.5 migration guide](https://platform.claude.com/docs/en/models/opus-5-5/migration-guide)
* [Claude Sonnet 5.5 migration guide](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide)
* [Claude Haiku 5.5 migration guide](https://platform.claude.com/docs/en/models/haiku-5-5/migration-guide)

## Get help

* Check the [API documentation](https://platform.claude.com/docs/en/api/overview) for detailed specifications
* Review [model capabilities](https://platform.claude.com/docs/en/models/overview) for performance comparisons
* Review [API release notes](https://platform.claude.com/docs/en/release-notes/overview) for API updates
* Contact support if you encounter any issues during migration