Is the Opus 4 5 Migration skill free?

Yes. The skill itself is free from gotalab/skillport. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Opus 4 5 Migration SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.

How do I install 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 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.

Opus 4 5 Migration

Migrates Claude API model strings and prompts from Sonnet 4.x / Opus 4.1 to Opus 4.5

by gotalab · gotalab/skillport

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.8/10
Tested: Jul 21, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 1a0de57

Fetched SKILL.md and both references via raw GitHub (effort.md and prompt-snippets.md each HTTP 200). Frontmatter has valid name+description; no scripts, hardcoded paths, or security smells. For output I wrote original.py (a Sonnet 4.5 messages.create call carrying a context-1m-2025-08-07 beta header), then a baseline naive migration vs a strict skill-followed migration. Baseline updated only the model string and left the unsupported 1M beta header in place; the skill artifact additionally removed that header with the prescribed comment and added the effort config (betas=["effort-2025-11-24"], output_config={"effort":"high"}) — a concrete, correct improvement. I could not independently verify Anthropic's actual effort-2025-11-24 beta API shape, so output is scored real-but-narrow rather than perfect.

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 7/10
Docs & honesty 5/5

What Opus 4 5 Migration does

Updates a codebase's Claude model strings, beta headers, and API config to target Opus 4.5 across Anthropic API, Bedrock, Vertex, and Azure. Triggers when the user asks to migrate or update prompts, code, or API calls from Sonnet 4.0/4.5 or Opus 4.1 to Opus 4.5; explicitly excludes Haiku. Also supplies optional prompt-adjustment snippets for known Opus 4.5 behavioral differences, applied only on user request.

How to install Opus 4 5 Migration

git clone --depth 1 https://github.com/gotalab/skillport.git /tmp/opus-4-5-migration-src
mkdir -p ~/.claude/skills
cp -R /tmp/opus-4-5-migration-src/.skills/experimental/opus-4-5-migration ~/.claude/skills/opus-4-5-migration
# Pure-instruction skill: SKILL.md + references/effort.md + references/prompt-snippets.md. No deps, no scripts, no API keys needed to install.
# Note: skill lives under .skills/experimental/ in the repo.

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Opus 4 5 Migration

/opus-4-5-migration Migrates Claude API model strings and prompts from Sonnet 4.x / Opus 4.1 to Opus 4.5

It also activates on plain-language prompts like these:

Migrate this codebase to use Opus 4.5
Update our API calls from Sonnet 4 to Opus 4.5
Fix prompt behavior differences after the Opus upgrade

Frequently asked questions

Is the Opus 4 5 Migration skill free?: Yes. The skill itself is free from gotalab/skillport. SkillProof publishes the install command and an independent test verdict at no cost.
Does Opus 4 5 Migration work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 21, 2026. Verdict: Tested · Works. Fetched SKILL.md and both references via raw GitHub (effort.md and prompt-snippets.md each HTTP 200). Frontmatter has valid name+description; no scripts, hardcoded paths, or security smells. For output I wrote original.py (a Sonnet 4.5 messages.create call carrying a context-1m-2025-08-07 beta header), then a baseline naive migration vs a strict skill-followed migration. Baseline updated only the model string and left the unsupported 1M beta header in place; the skill artifact additionally removed that header with the prescribed comment and added the effort config (betas=["effort-2025-11-24"], output_config={"effort":"high"}) — a concrete, correct improvement. I could not independently verify Anthropic's actual effort-2025-11-24 beta API shape, so output is scored real-but-narrow rather than perfect.
What is the Opus 4 5 Migration SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.
How do I install 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 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.