# Migrate Claude Applications to Opus 4.5

Updating model identifiers and prompts across providers can be inconsistent. This skill guides targeted Opus 4.5 migrations with provider settings and prompt adjustments.

## Install

```bash
npx skillstore add anthropics/claude-opus-4-5-migration
```

## Metadata

- Status: approved
- Slug: claude-opus-4-5-migration
- Skillstore revision: r2
- Version status: missing
- Tree hash: f5f95614b1166de1cfd26f576956a796f27043802f6da2c4606b83151d57ee18
- Author: anthropics
- GitHub username: anthropics
- License: MIT
- Repository: https://github.com/anthropics/claude-code/tree/main/plugins/claude-opus-4-5-migration/skills/claude-opus-4-5-migration
- Ref: c43861a65bb95efcae259cd161c9d6f4dc7eec6f
- Supported tools: Claude, Codex, Claude Code
- Audit status: complete
- Agent install advisory: allowed
- Manual install advisory: allowed
- Artifact signature: available
- Audit attestation: unavailable
- Human verification: not\_verified
- Risk factors: external\_commands
- Quality score: 75
- Public page: https://skillstore.pages.dev/skills/claude-opus-4-5-migration
- Manifest: https://skillstore.pages.dev/api/skills/claude-opus-4-5-migration/manifest

## Capabilities

- Searches projects for supported Sonnet 4.0, Sonnet 4.5, and Opus 4.1 model identifiers.
- Selects the documented Opus 4.5 identifier for Anthropic API, AWS Bedrock, Google Vertex AI, or Azure AI Foundry.
- Removes the unsupported one-million-token context beta header and adds an explanatory comment.
- Provides high-effort configuration guidance and the required beta flag.
- Adjusts prompts for reported tool overuse, excess complexity, limited code exploration, generic frontend design, or thinking sensitivity.
- Summarizes model, header, effort, and prompt changes after migration.

## Use Cases

- Upgrade an Anthropic Application: Update eligible model calls, remove an incompatible context header, and review effort settings in an existing application.
- Update Managed Cloud Models: Apply the documented Opus 4.5 identifier for Bedrock, Vertex AI, or Azure AI Foundry.
- Tune Migrated Prompts: Address specific Opus 4.5 behavior changes while preserving the existing prompt structure and functional content.

## Prompt Templates

### Basic Model Upgrade

```
Migrate [project path] from [supported source model] to Opus 4.5. Update only model identifiers and summarize the changed files.
```

### Provider-Specific Migration

```
Migrate [project path] to Opus 4.5 on [provider]. Review model identifiers, unsupported headers, and effort configuration, then summarize each change.
```

### Prompt Behavior Adjustment

```
Review [prompt file] for Opus 4.5 after [reported issue]. Apply only relevant prompt adjustments and explain every modification.
```

### Complete Migration Review

```
Perform a complete Opus 4.5 migration for [project]. Detect the provider, update eligible models, review headers and effort settings, assess reported prompt issues, and summarize changes.
```

## Limitations

- Only Sonnet 4.0, Sonnet 4.5, and Opus 4.1 are supported as source models.
- Haiku models are explicitly excluded from migration.
- Prompt adjustments require an explicit request or a reported behavior issue.
- The guide uses dated model identifiers and beta headers, so current provider support needs separate verification.

## Best Practices

- Confirm the active provider before replacing model identifiers.
- Apply prompt snippets only for an explicit request or a reproduced behavior issue.
- Review the final diff and verify current model availability before deployment.

## Anti Patterns

- Do not migrate Haiku model references with this skill.
- Do not append every prompt snippet without matching a reported issue.
- Do not assume dated model identifiers or beta flags remain current without provider verification.

## Security Audit

- Audited at: 2026-07-23T12:26:56.576\+00:00
- Summary: All 30 static findings are false positives. The six blocker matches are ordinary coding and design guidance, while the 24 command matches are Markdown delimiters, identifiers, or reference links with no execution behavior. No prompt injection or other semantic security risk was found.

## Stats

- Views: 258
- Downloads: 14
- Favorites: 0
- Popularity score: 0