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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.319 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 2 Sep 2026
One change · claude-code

How the agent loop works changedagent-sdk/agent-loop

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193193The `effort` option controls how much reasoning Claude applies. Lower effort levels use fewer tokens per turn and reduce cost. Not all models support the effort parameter. See [Effort](https://platform.claude.com/docs/en/build-with-claude/effort) for which models support it.
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195| Level | Behavior | Good for |
196| :--------- | :-------------------------------- | :------------------------------------------------------------------------ |
197| `"low"` | Minimal reasoning, fast responses | File lookups, listing directories |
198| `"medium"` | Balanced reasoning | Routine edits, standard tasks |
199| `"high"` | Thorough analysis | Refactors, debugging |
200| `"xhigh"` | Extended reasoning depth | Coding and agentic tasks; recommended on Fable 5, Opus 4.7+, and Sonnet 5 |
201| `"max"` | Maximum reasoning depth | Multi-step problems requiring deep analysis |
195| Level | Behavior | Good for |
196| :--------- | :-------------------------------- | :--------------------------------------------------------------------------------------------- |
197| `"low"` | Minimal reasoning, fast responses | File lookups, listing directories |
198| `"medium"` | Balanced reasoning | Routine edits, standard tasks |
199| `"high"` | Thorough analysis | Refactors, debugging |
200| `"xhigh"` | Extended reasoning depth | Coding and agentic tasks on the [models that support it](/docs/en/model-config#adjust-effort-level) |
201| `"max"` | Maximum reasoning depth | Multi-step problems requiring deep analysis |
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203203If you don't set `effort`, both SDKs leave the parameter unset and defer to the model's default behavior.
204204 
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