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HomeDocsClaude Code CLI 28 Sep 2026
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Escalate hard decisions with the advisor tool changedadvisor

Nearest release: v2.1.284, published under an hour before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 28 Sep 2026 17:53 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 28 Sep 2026 18:07 UTC.

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8383 
8484The advisor must be at least as capable as the main model. The accepted advisors for each main model are:
8585 
86| Main model | Accepted advisors | Notes |
87| -------------------- | ---------------------------------- | ---------------------------------------------------------------------------------------------- |
88| Haiku 4.5 | Fable, Opus, Sonnet | Haiku can call the advisor but cannot act as one |
89| Sonnet 4.6 | Fable, Opus, Sonnet | |
90| Sonnet 5 | Fable, Opus 4.7 or later, Sonnet 5 | A Sonnet 4.6 advisor is rejected, and the API refuses an Opus 4.6 advisor |
91| Opus 4.6 | Fable, Opus, Sonnet 5 | A Sonnet 4.6 advisor is rejected |
92| Opus 4.7 or Opus 4.8 | Fable, and Opus 4.7 or later | An Opus 4.6 or Sonnet advisor is rejected |
93| Opus 5.5 or Opus 5 | Fable, and Opus 5 or later | An Opus 4.6 or Sonnet advisor is rejected, and the API refuses an Opus 4.7 or Opus 4.8 advisor |
94| Fable 5 | Fable 5.1 or Fable 5 | An Opus or Sonnet advisor is rejected |
95| Fable 5.1 | Fable 5.1 | An Opus or Sonnet advisor is rejected, and the API refuses a Fable 5 advisor |
86| Main model | Accepted advisors | Notes |
87| ---------------------- | ------------------------------------------- | ---------------------------------------------------------------------------------------------- |
88| Haiku 4.5 | Fable, Opus, Sonnet | Haiku can call the advisor but cannot act as one |
89| Sonnet 4.6 | Fable, Opus, Sonnet | |
90| Sonnet 5.5 or Sonnet 5 | Fable, Opus 4.7 or later, Sonnet 5 or later | A Sonnet 4.6 advisor is rejected, and the API refuses an Opus 4.6 advisor |
91| Opus 4.6 | Fable, Opus, Sonnet 5 or later | A Sonnet 4.6 advisor is rejected |
92| Opus 4.7 or Opus 4.8 | Fable, and Opus 4.7 or later | An Opus 4.6 or Sonnet advisor is rejected |
93| Opus 5.5 or Opus 5 | Fable, and Opus 5 or later | An Opus 4.6 or Sonnet advisor is rejected, and the API refuses an Opus 4.7 or Opus 4.8 advisor |
94| Fable 5 | Fable 5.1 or Fable 5 | An Opus or Sonnet advisor is rejected |
95| Fable 5.1 | Fable 5.1 | An Opus or Sonnet advisor is rejected, and the API refuses a Fable 5 advisor |
9696 
9797Fable 5.1 requires Claude Code v2.1.257 or later. Both Fable models require [Fable access](/docs/en/model-config#work-with-fable).
9898 
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