Claude Opus 4 5 Migration
Handles the migration from Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5 by updating model strings across different platforms (Anthropic API, AWS Bedrock, Vertex AI, Azure) and removing unsupported beta headers. The workflow is straightforward: search for old model references, swap them out, add the effort parameter set to high, and summarize changes. What makes this useful is the prompt adjustment guidance for known Opus 4.5 quirks like tool overtriggering and over-engineering tendencies, though it only applies those fixes when you actually hit problems. Smart that it skips Haiku migrations entirely rather than pretending to handle everything. Most migrations will just be string replacements, which is exactly what you want.
- skills.sh installs
- 125
- GitHub stars
- 476
- last updated
- Aug 21, 2026
Install
$ npx -y skills add aiskillstore/marketplace --skill claude-opus-4-5-migration --agent claude-codeInstalls into .claude/skills of the current project.
Files
Opus 4.5 Migration Guide
One-shot migration from Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5.
Migration Workflow
- Search codebase for model strings and API calls
- Update model strings to Opus 4.5 (see platform-specific strings below)
- Remove unsupported beta headers
- Add effort parameter set to
"high"(seereferences/effort.md) - Summarize all changes made
- Tell the user: "If you encounter any issues with Opus 4.5, let me know and I can help adjust your prompts."
Model String Updates
Identify which platform the codebase uses, then replace model strings accordingly.
Unsupported Beta Headers
Remove the context-1m-2025-08-07 beta header if present—it is not yet supported with Opus 4.5. Leave a comment noting this:
# Note: 1M context beta (context-1m-2025-08-07) not yet supported with Opus 4.5
Target Model Strings (Opus 4.5)
| Platform | Opus 4.5 Model String |
|---|---|
| Anthropic API (1P) | claude-opus-4-5-20251101 |
| AWS Bedrock | anthropic.claude-opus-4-5-20251101-v1:0 |
| Google Vertex AI | claude-opus-4-5@20251101 |
| Azure AI Foundry | claude-opus-4-5-20251101 |
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- Repository
- github.com/aiskillstore/marketplace
- Categories
- Backend & APIs, AI & Agent Building
- First seen
- Jun 3, 2026
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