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HomeDocsClaude Code CLI 7 Oct 2026
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Escalate hard decisions with the advisor tool changedadvisor

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Upstream edited this page at 7 Oct 2026 17:51 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 7 Oct 2026 17:56 UTC.

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7373Claude Code uses the flag instead of the `advisorModel` setting for that session. It doesn't list `--advisor` in `claude --help`. Claude Code exits with an error at launch if:
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7575* The session's main model doesn't support the advisor
76* The requested model, such as Haiku, can't act as an advisor
76* The requested model, such as Haiku 4.5, can't act as an advisor
7777* Your organization's [`availableModels`](/docs/en/model-config#restrict-model-selection) allowlist excludes the requested model
7878* You requested Fable and your account still requires the [usage-credits consent](#fable-advisor-and-usage-credits)
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8787 
8888| Main model | Accepted advisors |
8989| - | - |
90| Haiku 4.5 | Fable, Opus, Sonnet |
91| Sonnet 4.6 | Fable, Opus, Sonnet |
92| Opus 4.6 | Fable, Opus, Sonnet 5 or later |
93| Sonnet 5 | Fable, Opus 4.7 or later, Sonnet 5 or later |
90| Haiku 4.5 | Fable, Opus, Sonnet, Haiku 5.5 |
91| Sonnet 4.6 | Fable, Opus, Sonnet, Haiku 5.5 |
92| Opus 4.6 | Fable, Opus, Sonnet 5 or later, Haiku 5.5 |
93| Sonnet 5 or Haiku 5.5 | Fable, Opus 4.7 or later, Sonnet 5 or later, Haiku 5.5 |
9494| Opus 4.7 or Opus 4.8 | Fable, Opus 4.7 or later, Sonnet 5.5 |
9595| Sonnet 5.5 | Fable, Opus 5 or later, Sonnet 5.5 |
9696| Opus 5 or Opus 5.5 | Fable, Opus 5 or later |
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9797| Fable 5 | Fable 5.1 or Fable 5 |
9898| Fable 5.1 | Fable 5.1 |
9999 
100Fable 5.1 requires Claude Code v2.1.257 or later. Fable models require [Fable access](/docs/en/model-config#work-with-fable). Sonnet 5.5 as the advisor for an Opus 4.7 or Opus 4.8 main model requires Claude Code v2.1.287 or later.
100Fable 5.1 requires Claude Code v2.1.257 or later. Fable models require [Fable access](/docs/en/model-config#work-with-fable). Sonnet 5.5 as the advisor for an Opus 4.7 or Opus 4.8 main model requires Claude Code v2.1.287 or later. Haiku 5.5 as the main model or as the advisor requires Claude Code v2.1.293 or later.
101101 
102Set the advisor as `fable`, `opus`, or `sonnet`. These aliases resolve to Claude Code's [built-in default version](/docs/en/model-config#model-aliases) for each model family, which advances with new Claude Code releases. You can also pass a full model ID such as `claude-opus-5-5`. Haiku can call the advisor but can't act as one.
102Set the advisor as `fable`, `opus`, or `sonnet`. These aliases resolve to Claude Code's [built-in default version](/docs/en/model-config#model-aliases) for each model family, which advances with new Claude Code releases. You can also pass a full model ID such as `claude-opus-5-5` or `claude-haiku-5-5`. Haiku 4.5 can call the advisor but can't act as one.
103103 
104104Subagents inherit the configured advisor and apply the same pairing check against their own model.
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172172The advisor tool requires all of the following:
173173 
174174* **Anthropic API only**: the advisor is a server-executed tool. It is not available on Amazon Bedrock, Claude Platform on AWS, Google Cloud's Agent Platform, or Microsoft Foundry. Through an [LLM gateway](/docs/en/llm-gateway) configured with `ANTHROPIC_BASE_URL`, availability depends on whether the gateway forwards the request intact to the Anthropic API. If the gateway or its upstream doesn't recognize the advisor tool, see [Automatic retry and error forwarding](/docs/en/llm-gateway-protocol#automatic-retry-and-error-forwarding) for how Claude Code responds.
175* **Supported main model**: Fable, Opus 4.6 or later, Sonnet 4.6 or later, or Haiku 4.5. See [Choose an advisor model](#choose-an-advisor-model) for which advisors each accepts.
175* **Supported main model**: Fable, Opus 4.6 or later, Sonnet 4.6 or later, Haiku 4.5, or Haiku 5.5. See [Choose an advisor model](#choose-an-advisor-model) for which advisors each accepts.
176176* **Feature-flag fetching**: Claude Code turns the advisor on through a feature flag it fetches from Anthropic. In a session where a variable that turns flag fetching off is set, such as `DISABLE_TELEMETRY`, the advisor stays off. See [Features that need feature-flag fetching](/docs/en/env-vars#features-that-need-feature-flag-fetching).
177177 
178178## Turn the advisor off
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