Migrate Claude model strings and prompts from Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5.
Works with
Updates model strings across Anthropic API, AWS Bedrock, Google Vertex AI, and Azure AI Foundry platforms
Removes unsupported beta headers (e.g., context-1m-2025-08-07 ) and adds effort parameter set to \"high\"
Provides optional prompt adjustments for known Opus 4.5 behavioral differences: tool overtriggering, over-engineering, code exploration conservatism, frontend design, and thinking s
AI-first code editor with Composer
Before installing skills in Cursor, ensure your development environment meets these requirements:
node --versionclaude-opus-4-5-migrationExecute the skills CLI command in your project's root directory to begin installation:
Fetches claude-opus-4-5-migration from anthropics/claude-code and configures it for Cursor.
The CLI shows a list of agents. Use arrow keys and space to select Cursor:
Confirm successful installation by checking the skill directory location:
Restart Cursor to activate claude-opus-4-5-migration. Access via /claude-opus-4-5-migration in your agent's command palette.
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your environment. Always review source, verify the publisher, and test in isolation before production.
Submit your Claude Code skill and start earning
Automate repetitive workflows and reduce manual effort
Example
Generate reports, summarize documents, draft communications
Save 3-5 hours per week on routine tasks
Learn new skills, understand complex topics, get expert guidance
Example
Explain concepts, provide examples, suggest learning resources
Accelerate learning and skill development by 2x
Enhance output quality through reviews, suggestions, and refinements
Example
Review drafts, suggest improvements, catch errors
Improve work quality by 30-40% with less effort
0
total installs
0
this week
110.1K
GitHub stars
0
upvotes
Run in your terminal
0
installs
0
this week
110.1K
stars
One-shot migration from Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5.
"high" (see references/effort.md)Identify which platform the codebase uses, then replace model strings accordingly.
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
| 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 |
| Source Model | Anthropic API (1P) | AWS Bedrock | Google Vertex AI |
|---|---|---|---|
| Sonnet 4.0 | claude-sonnet-4-20250514 |
anthropic.claude-sonnet-4-20250514-v1:0 |
claude-sonnet-4@20250514 |
| Sonnet 4.5 | claude-sonnet-4-5-20250929 |
anthropic.claude-sonnet-4-5-20250929-v1:0 |
claude-sonnet-4-5@20250929 |
| Opus 4.1 | claude-opus-4-1-20250422 |
anthropic.claude-opus-4-1-20250422-v1:0 |
claude-opus-4-1@20250422 |
Do NOT migrate: Any Haiku models (e.g., claude-haiku-4-5-20251001).
Opus 4.5 has known behavioral differences from previous models. Only apply these fixes if the user explicitly requests them or reports a specific issue. By default, just update model strings.
Integration guidelines: When adding snippets, don't just append them to prompts. Integrate them thoughtfully:
<code_guidelines>, <tool_usage>) to organize additionsOpus 4.5 is more responsive to system prompts. Aggressive language that prevented undertriggering on previous models may now cause overtriggering.
Apply if: User reports tools being called too frequently or unnecessarily.
Find and soften:
CRITICAL: → remove or softenYou MUST... → You should...ALWAYS do X → Do XNEVER skip... → Don't skip...REQUIRED → remove or softenOnly apply to tool-triggering instructions. Leave other uses of emphasis alone.
Opus 4.5 tends to create extra files, add unnecessary abstractions, or build unrequested flexibility.
Apply if: User reports unwanted files, excessive abstraction, or unrequested features. Add the snippet from references/prompt-snippets.md.
Opus 4.5 can be overly conservative about exploring code, proposing solutions without reading files.
Apply if: User reports the model proposing fixes without inspecting relevant code. Add the snippet from references/prompt-snippets.md.
Apply if: User requests improved frontend design quality or reports generic-looking outputs.
Add the frontend aesthetics snippet from references/prompt-snippets.md.
When extended thinking is not enabled (the default), Opus 4.5 is particularly sensitive to the word "think" and its variants. Extended thinking is enabled only if the API request contains a thinking parameter.
Apply if: User reports issues related to "thinking" while extended thinking is not enabled (no thinking parameter in request).
Replace "think" with alternatives like "consider," "believe," or "evaluate."
See references/prompt-snippets.md for the full text of each snippet to add.
See references/effort.md for configuring the effort parameter (only if user requests it).
Prerequisites
Time Estimate
15-45 minutes depending on use case complexity
Steps
Common Pitfalls
✓ Do
✗ Don't
💡 Pro Tips
✓ Use when
Use when skill capabilities match your task, clear ROI on time saved, and you can validate outputs. Best for repetitive tasks, learning, and quality improvement.
✗ Avoid when
Avoid when task requires deep expertise you can't validate, involves sensitive decisions, or when learning process is more valuable than speed of completion.
anthropics/claude-code
aradotso/trending-skills
anthropics/skills
anthropics/skills
JuliusBrussee/caveman
JuliusBrussee/caveman
Keeps context tight: claude-opus-4-5-migration is the kind of skill you can hand to a new teammate without a long onboarding doc.
Registry listing for claude-opus-4-5-migration matched our evaluation — installs cleanly and behaves as described in the markdown.
Solid pick for teams standardizing on skills: claude-opus-4-5-migration is focused, and the summary matches what you get after install.
claude-opus-4-5-migration is among the better-maintained entries we tried; worth keeping pinned for repeat workflows.
Solid pick for teams standardizing on skills: claude-opus-4-5-migration is focused, and the summary matches what you get after install.
Registry listing for claude-opus-4-5-migration matched our evaluation — installs cleanly and behaves as described in the markdown.
claude-opus-4-5-migration reduced setup friction for our internal harness; good balance of opinion and flexibility.
I recommend claude-opus-4-5-migration for anyone iterating fast on agent tooling; clear intent and a small, reviewable surface area.
Useful defaults in claude-opus-4-5-migration — fewer surprises than typical one-off scripts, and it plays nicely with `npx skills` flows.
Solid pick for teams standardizing on skills: claude-opus-4-5-migration is focused, and the summary matches what you get after install.
showing 1-10 of 37