Is the Claude Opus 4.5 Migration skill free?

Yes. The skill itself is free from DennisLiuCk/claude-plugin-marketplace. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Claude Opus 4.5 Migration SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.

How do I install Claude Opus 4.5 Migration?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Claude Opus 4.5 Migration with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Claude Opus 4.5 Migration

One-shot migrate code and prompts from Sonnet/Opus 4.1 to Opus 4.5

by DennisLiuCk · DennisLiuCk/claude-plugin-marketplace

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 25, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Jul 30, 2026 · 24bc1e0

⚠ This skill is no longer available upstream. Our re-check on Aug 10, 2026 couldn't find it any more (repo unreachable/deleted). The test below is what we measured on Jul 25, 2026 and we're leaving it up as a record — but there is nothing left to install, so we've removed the command.

On a test file mixing a Sonnet 4.5 call, a Bedrock string, and a Haiku helper, the skill produced the exact dated strings (claude-opus-4-5-20251101, anthropic.claude-opus-4-5-20251101-v1:0), left the Haiku model untouched, and applied two non-obvious rules a from-memory baseline would likely miss: stripping the unsupported context-1m-2025-08-07 beta with a note and adding the exact effort-2025-11-24 flag. The lookup tables turn guesswork into a deterministic, correct edit.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 8/10
Docs & honesty 5/5

What Claude Opus 4.5 Migration does

Migrates model strings and API calls from Sonnet 4.0/4.5 or Opus 4.1 to Opus 4.5 across Anthropic API, Bedrock, Vertex, and Azure, removes the unsupported 1M-context beta header, and optionally adds the effort parameter. Triggers when you ask to update code, prompts, or API calls to Opus 4.5. Deliberately leaves Haiku models untouched.

How to install Claude Opus 4.5 Migration

Nothing to install: the source repository no longer has this skill. If the author brings it back, our daily re-check will pick it up and the command will reappear here.

Commands — how to trigger Claude Opus 4.5 Migration

/claude-opus-4-5-migration One-shot migrate code and prompts from Sonnet/Opus 4.1 to Opus 4.5

It also activates on plain-language prompts like these:

Migrate my code from Sonnet 4.5 to Opus 4.5
Update my Anthropic model strings to Opus 4.5 everywhere
Switch my Bedrock Claude API calls over to Opus 4.5

Frequently asked questions

Is the Claude Opus 4.5 Migration skill free?: Yes. The skill itself is free from DennisLiuCk/claude-plugin-marketplace. SkillProof publishes the install command and an independent test verdict at no cost.
Does Claude Opus 4.5 Migration work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 25, 2026. Verdict: Tested · Works. On a test file mixing a Sonnet 4.5 call, a Bedrock string, and a Haiku helper, the skill produced the exact dated strings (claude-opus-4-5-20251101, anthropic.claude-opus-4-5-20251101-v1:0), left the Haiku model untouched, and applied two non-obvious rules a from-memory baseline would likely miss: stripping the unsupported context-1m-2025-08-07 beta with a note and adding the exact effort-2025-11-24 flag. The lookup tables turn guesswork into a deterministic, correct edit.
What is the Claude Opus 4.5 Migration SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.
How do I install Claude Opus 4.5 Migration?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Claude Opus 4.5 Migration with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.