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skills/claude-opus-4-5-migration/references/effort.md

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+# Effort Parameter (Beta)
+
+**Add effort set to `"high"` during migration.** This is the default configuration for best performance with Opus 4.5.
+
+## Overview
+
+Effort controls how eagerly Claude spends tokens. It affects all tokens: thinking, text responses, and function calls.
+
+| Effort | Use Case |
+|--------|----------|
+| `high` | Best performance, deep reasoning (default) |
+| `medium` | Balance of cost/latency vs. performance |
+| `low` | Simple, high-volume queries; significant token savings |
+
+## Implementation
+
+Requires beta flag `effort-2025-11-24` in API calls.
+
+**Python SDK:**
+```python
+response = client.messages.create(
+    model="claude-opus-4-5-20251101",
+    max_tokens=1024,
+    betas=["effort-2025-11-24"],
+    output_config={
+        "effort": "high"  # or "medium" or "low"
+    },
+    messages=[...]
+)
+```
+
+**TypeScript SDK:**
+```typescript
+const response = await client.messages.create({
+  model: "claude-opus-4-5-20251101",
+  max_tokens: 1024,
+  betas: ["effort-2025-11-24"],
+  output_config: {
+    effort: "high"  // or "medium" or "low"
+  },
+  messages: [...]
+});
+```
+
+**Raw API:**
+```json
+{
+  "model": "claude-opus-4-5-20251101",
+  "max_tokens": 1024,
+  "anthropic-beta": "effort-2025-11-24",
+  "output_config": {
+    "effort": "high"
+  },
+  "messages": [...]
+}
+```
+
+## Effort vs. Thinking Budget
+
+Effort is independent of thinking budget:
+
+- High effort + no thinking = more tokens, but no thinking tokens
+- High effort + 32k thinking = more tokens, but thinking capped at 32k
+
+## Recommendations
+
+1. First determine effort level, then set thinking budget
+2. Best performance: high effort + high thinking budget
+3. Cost/latency optimization: medium effort
+4. Simple high-volume queries: low effort