Agent skill · software engineering · aiskillstore
claude-opus-4-5-migration
Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5. Use when the user wants to update their codebase, prompts, or API calls to use Opus 4.5. Handles model string updates and prompt adjustments for known Opus 4.5 behavioral differences. Does NOT migrate Haiku 4.5.
Why this skill is useful
Adds a comprehensive migration script that updates model strings and adjusts prompts for Opus 4.5, which the AI cannot generate on its own.
What it needs
About 3k tokens when loaded. Last updated 2026-08-07. 405 stars on the source repository.
What this skill does
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 1. Search codebase for model strings and API calls 2. Update model strings to Opus 4.5 (see platform-specific strings below) 3. Remove unsupported beta headers 4. Add effort parameter set to "high" (see references/effort.md) 5. Summarize all changes made 6. 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: 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 Source Model Strings to Replace 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). Prompt Adjustments 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. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills aiskillstore/claude-opus-4-5-migration