migration-guide changedmodels/haiku-5-5/migration-guide
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88 This guide covers migrating [Messages API](https://platform.claude.com/docs/en/build-with-claude/working-with-messages) code. If you use [Claude Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview), no changes beyond updating the model name are required.
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11<Tip>
12 **Automate your migration with the [Claude API skill](https://platform.claude.com/docs/en/agents-and-tools/agent-skills/claude-api-skill#migrating-to-a-newer-claude-model).** It comes bundled with Claude Code and works for any current Claude model as the target:
11Let Claude Code migrate your code for you
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14 Let Claude Code migrate your code for you
15
16 ```text
17 /claude-api migrate this project to claude-haiku-5-5
18 ```
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20 The skill applies the model ID swap and, as needed, breaking parameter changes, prefill replacement, and effort calibration for your target model across your code base, then produces a checklist of items to verify manually. It asks you to confirm the migration scope (entire working directory, a subdirectory, or a specific file list) before editing any files. The skill also detects Amazon Bedrock and Claude Platform on AWS clients and adjusts model ID formats and feature changes for those platforms.
21</Tip>
13```text
14/claude-api migrate this project to claude-haiku-5-5
15```
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2317This guide covers moving code that calls Claude Haiku 4.5 to Claude Haiku 5.5. For code that calls Claude Haiku 3.5 or Claude Haiku 3, also make the changes in [Migrating to Claude Haiku 5.5 from Claude Haiku 3.5 and earlier Haiku models](https://platform.claude.com/docs/en/models/haiku-5-5/migration-guide#migrating-from-haiku-35). To move up to a Sonnet or Opus model instead, see [Upgrade between model versions](https://platform.claude.com/docs/en/about-claude/models/migration-guide). For how long Claude Haiku 4.5 stays available, see [Model deprecations](https://platform.claude.com/docs/en/about-claude/model-deprecations).
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