claude-opus-4-5-migration

Name: claude-opus-4-5-migration
Author: anthropics

byanthropics· 237 skills

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How to install claude-opus-4-5-migration?

anthropics/claude-code/claude-opus-4-5-migration

$npx -y skills add anthropics/claude-code --skill claude-opus-4-5-migration

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Run `npx skills use "https://github.com/anthropics/claude-code" --skill "anthropics/claude-code/claude-opus-4-5-migration"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

Use the whole pack

Use the skills in "https://github.com/anthropics/claude-code" that are relevant to the current task. Run `npx skills add "https://github.com/anthropics/claude-code"` and select the relevant skills, then follow their instructions.

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SKILL.md

1	# Opus 4.5 Migration Guide
2
3	One-shot migration from Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5.
4
5	## Migration Workflow
6
7	1. Search codebase for model strings and API calls
8	2. Update model strings to Opus 4.5 (see platform-specific strings below)
9	3. Remove unsupported beta headers
10	4. Add effort parameter set to `"high"` (see `references/effort.md`)
11	5. Summarize all changes made
12	6. Tell the user: "If you encounter any issues with Opus 4.5, let me know and I can help adjust your prompts."
13
14	## Model String Updates
15
16	Identify which platform the codebase uses, then replace model strings accordingly.
17
18	### Unsupported Beta Headers
19
20	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:
21
22	```python
23	# Note: 1M context beta (context-1m-2025-08-07) not yet supported with Opus 4.5
24	```
25
26	### Target Model Strings (Opus 4.5)
27
28	\| Platform \| Opus 4.5 Model String \|
29	\|----------\|----------------------\|
30	\| Anthropic API (1P) \| `claude-opus-4-5-20251101` \|
31	\| AWS Bedrock \| `anthropic.claude-opus-4-5-20251101-v1:0` \|
32	\| Google Vertex AI \| `claude-opus-4-5@20251101` \|
33	\| Azure AI Foundry \| `claude-opus-4-5-20251101` \|
34
35	### Source Model Strings to Replace
36
37	\| Source Model \| Anthropic API (1P) \| AWS Bedrock \| Google Vertex AI \|
38	\|--------------\|-------------------\|-------------\|------------------\|
39	\| Sonnet 4.0 \| `claude-sonnet-4-20250514` \| `anthropic.claude-sonnet-4-20250514-v1:0` \| `claude-sonnet-4@20250514` \|
40	\| Sonnet 4.5 \| `claude-sonnet-4-5-20250929` \| `anthropic.claude-sonnet-4-5-20250929-v1:0` \| `claude-sonnet-4-5@20250929` \|
41	\| Opus 4.1 \| `claude-opus-4-1-20250422` \| `anthropic.claude-opus-4-1-20250422-v1:0` \| `claude-opus-4-1@20250422` \|
42
43	Do NOT migrate: Any Haiku models (e.g., `claude-haiku-4-5-20251001`).
44
45	## Prompt Adjustments
46
47	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.
48
49	Integration guidelines: When adding snippets, don't just append them to prompts. Integrate them thoughtfully:
50	- Use XML tags (e.g., `<code_guidelines>`, `<tool_usage>`) to organize additions
51	- Match the style and structure of the existing prompt
52	- Place snippets in logical locations (e.g., coding guidelines near other coding instructions)
53	- If the prompt already uses XML tags, add new content within appropriate existing tags or create consistent new ones
54
55	### 1. Tool Overtriggering
56
57	Opus 4.5 is more responsive to system prompts. Aggressive language that prevented undertriggering on previous models may now cause overtriggering.
58
59	Apply if: User reports tools being called too frequently or unnecessarily.
60
61	Find and soften:
62	- `CRITICAL:` → remove or soften
63	- `You MUST...` → `You should...`
64	- `ALWAYS do X` → `Do X`
65	- `NEVER skip...` → `Don't skip...`
66	- `REQUIRED` → remove or soften
67
68	Only apply to tool-triggering instructions. Leave other uses of emphasis alone.
69
70	### 2. Over-Engineering Prevention
71
72	Opus 4.5 tends to create extra files, add unnecessary abstractions, or build unrequested flexibility.
73
74	Apply if: User reports unwanted files, excessive abstraction, or unrequested features. Add the snippet from `references/prompt-snippets.md`.
75
76	### 3. Code Exploration
77
78	Opus 4.5 can be overly conservative about exploring code, proposing solutions without reading files.
79
80	Apply if: User reports the model proposing fixes without inspecting relevant code. Add the snippet from `references/prompt-snippets.md`.
81
82	### 4. Frontend Design
83
84	Apply if: User requests improved frontend design quality or reports generic-looking outputs.
85
86	Add the frontend aesthetics snippet from `references/prompt-snippets.md`.
87
88	### 5. Thinking Sensitivity
89
90	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.
91
92	Apply if: User reports issues related to "thinking" while extended thinking is not enabled (no `thinking` parameter in request).
93
94	Replace "think" with alternatives like "consider," "believe," or "evaluate."
95
96	## Reference
97
98	See `references/prompt-snippets.md` for the full text of each snippet to add.
99
100	See `references/effort.md` for configuring the effort parameter (only if user requests it).

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Run `npx skills use "https://github.com/anthropics/claude-code" --skill "anthropics/claude-code/claude-opus-4-5-migration"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

Use the skills in "https://github.com/anthropics/claude-code" that are relevant to the current task. Run `npx skills add "https://github.com/anthropics/claude-code"` and select the relevant skills, then follow their instructions.

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