The whole hunk
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830830If your account requires the [usage-credits consent](/docs/en/advisor#fable-advisor-and-usage-credits), accept it first by running `/model fable`. Until you do, picking Fable in `/advisor` saves nothing and Claude Code tells you to run `/model fable` first.
831831
832832* **Scope**: [`Any file`](#scopes)
833* **Type**: string, one of the aliases `"fable"`, `"opus"`, or `"sonnet"`, which resolve to Claude Code's current default version of that model family, or a full model ID such as `"claude-opus-5"`
833* **Type**: string, one of the aliases `"fable"`, `"opus"`, or `"sonnet"`, which resolve to Claude Code's current default version of that model family, or a full model ID such as `"claude-opus-5-5"`
834834* **Default**: unset, so the advisor is off
835835* **Per-session overrides**: `--advisor` takes precedence over this key for one session. [`CLAUDE_CODE_DISABLE_ADVISOR_TOOL`](/docs/en/env-vars) turns the advisor off, and this key can't turn it back on
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846846
847847Turn [extended thinking](/docs/en/model-config#extended-thinking) off for every session by setting this to `false`. Thinking is on by default, so `true` changes nothing. Most people set this through `/config` rather than by editing the file.
848848
849On models that always think, such as the Fable models, `false` has no effect. On [third-party providers](/docs/en/third-party-integrations) Claude Code omits the `thinking` parameter instead of turning thinking off, so adaptive-reasoning models may still think. With thinking turned off on the Anthropic API, Claude Code sends effort `high` instead of a higher level to models it knows [don't accept that combination](/docs/en/errors#effort-isnt-available-with-thinking-turned-off), such as Opus 5.
849On models that always think, such as Opus 5.5 and the Fable models, `false` has no effect. On [third-party providers](/docs/en/third-party-integrations) Claude Code omits the `thinking` parameter instead of turning thinking off, so adaptive-reasoning models may still think. With thinking turned off on the Anthropic API, Claude Code sends effort `high` instead of a higher level to models it knows [don't accept that combination](/docs/en/errors#effort-isnt-available-with-thinking-turned-off), such as Opus 5.
850850
851851* **Scope**: [`Any file`](#scopes)
852852* **Type**: Boolean
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887887
888888Within the same settings file, Claude Code uses a model's saved level rather than this key. [`modelSettings`](#modelsettings) states the cross-file precedence.
889889
890In a session attached to a remote worker, `/effort` applies to that session only. In a `-p` run or the Agent SDK it also applies to that session only, [unless a hold on the model's default effort is in effect](/docs/en/model-config#non-interactive-effort). [Adjust effort level](/docs/en/model-config#adjust-effort-level) lists the interactive picks that also apply to that session only. The message that `/effort` prints says which happened.
890In a session attached to a remote worker, in a `-p` run, and in the Agent SDK, `/effort` applies to that session only. [Adjust effort level](/docs/en/model-config#adjust-effort-level) lists the interactive picks that also apply to that session only. The message that `/effort` prints says which happened.
891891
892892* **Scope**: [`Any file`](#scopes)
893893* **Type**: string, one of:
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904904}
905905```
906906
907On Opus 4.7, Opus 4.8, and Fable 5, Claude Code holds that model's default effort, organization-set or built-in; [Adjust effort level](/docs/en/model-config#adjust-effort-level) states which ways of setting a level end the hold and which leave it in place. Once the hold ends, Claude Code resolves effort by the precedence stated at [`modelSettings`](#modelsettings).
907In your user settings file, `~/.claude/settings.json`, this key is the older form `/effort` wrote before it saved levels per model, and it keeps applying where it applied before, on Opus 5, Fable 5.1, and earlier models. Opus 5.5 and models released after it ignore it and start at their own default until you save a level for them, which `/effort` writes under [`modelSettings`](#modelsettings). In project, local, and managed settings, and with `--settings`, this key applies to every model.
908908
909909### `enforceAvailableModels`
910910
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952952
953953### `fastMode`
954954
955Turn [fast mode](/docs/en/fast-mode) on for sessions where it's available, for interactive work like rapid iteration or live debugging where you want speed at a higher cost per token. You don't usually edit this key by hand: running `/fast` writes `fastMode: true` to `~/.claude/settings.json`, and running it again to turn fast mode off removes the key. Fast mode runs only on Opus 5 and Opus 4.8: turning it on from another model switches you to Opus, and switching to an unsupported model turns it off. See [Switch models while fast mode is on](/docs/en/fast-mode#switch-models-while-fast-mode-is-on).
955Turn [fast mode](/docs/en/fast-mode) on for sessions where it's available, for interactive work like rapid iteration or live debugging where you want speed at a higher cost per token. You don't usually edit this key by hand: running `/fast` writes `fastMode: true` to `~/.claude/settings.json`, and running it again to turn fast mode off removes the key. Fast mode runs only on Opus 5.5, Opus 5, and Opus 4.8: turning it on from another model switches you to Opus, and switching to an unsupported model turns it off. See [Switch models while fast mode is on](/docs/en/fast-mode#switch-models-while-fast-mode-is-on).
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957957* **Scope**: [`Any file`](#scopes)
958958* **Type**: Boolean
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11721172
11731173Edit the key by hand to change or remove a level you saved.
11741174
1175A model's `effortLevel` here takes precedence over the top-level [`effortLevel`](#effortlevel) in the same settings file. Across files, Claude Code resolves each model separately: the highest-precedence [settings file](/docs/en/settings#settings-precedence) that sets either an `effortLevel` for that model or the top-level `effortLevel` decides, so an `effortLevel` in managed settings outranks a level you saved in user settings. [Adjust effort level](/docs/en/model-config#adjust-effort-level) lists what else can override a saved level, such as `--effort` at launch.
1175A model's `effortLevel` here takes precedence over the top-level [`effortLevel`](#effortlevel) in the same settings file. Across files, Claude Code resolves each model separately: the highest-precedence [settings file](/docs/en/settings#settings-precedence) that sets either an `effortLevel` for that model or a top-level `effortLevel` that [applies to that model](#effortlevel) decides, so an `effortLevel` in managed settings outranks a level you saved in user settings. [Adjust effort level](/docs/en/model-config#adjust-effort-level) lists what else can override a saved level, such as `--effort` at launch.
11761176
11771177To cap one model's effort rather than set its level, add a [`maxEffortLevel`](#maxeffortlevel) field to that model's entry. The field requires Claude Code v2.1.267 or later.
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11801180* **Type**: object mapping a model name to an object with an `effortLevel` field, one of `"low"`, `"medium"`, `"high"`, or `"xhigh"`, a [`maxEffortLevel`](#maxeffortlevel) field, or both
11811181* **Default**: unset
11821182
1183Claude Code writes each entry under the model's canonical name, such as `claude-opus-5`, and matches that model's alias, date-suffixed, `[1m]`, and recognized provider-specific IDs to the same entry.
1183Claude Code writes each entry under the model's canonical name, such as `claude-opus-5-5`, and matches that model's alias, date-suffixed, `[1m]`, and recognized provider-specific IDs to the same entry.
11841184
1185This example keeps Opus 5 at `medium` while other models use their own saved or default levels:
1185This example keeps Opus 5.5 at `high` while other models use their own saved or default levels:
11861186
11871187```json settings.json theme={null}
11881188{
11891189 "modelSettings": {
1190 "claude-opus-5": {
1191 "effortLevel": "medium"
1190 "claude-opus-5-5": {
1191 "effortLevel": "high"
11921192 }
11931193 }
11941194}
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32203220* **Type**: Boolean
32213221 * `true`: Claude Code adds the command's output to the conversation and Claude replies to it
32223222 * `false`: Claude Code adds the output to context without a reply
3223* **Default**: `true`
3224
3225```json settings.json theme={null}
3226{
3227 "respondToB
3223* **Default**: `