Escalate hard decisions with the advisor tool changedadvisor
Nearest release: v2.1.267, published an hour after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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14 Aug 2026
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Recorded edits22to this page, all time
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8484| Opus 4.7 or later | Fable, and Opus 4.7 or later | Opus 4.7 and later Opus models are ranked as equally capable, so any of them accepts another as an advisor. An Opus 4.7 main with an Opus 4.6 or Sonnet 5 advisor is rejected |
8585| Fable 5.1 or Fable 5 | Fable 5.1, or the same Fable version | An Opus or Sonnet advisor is rejected, and so is a Fable 5 advisor for a Fable 5.1 main model |
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87Fable 5.1 requires Claude Code v2.1.255 or later and Fable 5 requires v2.1.170 or later, plus [Fable access](/docs/en/model-config#work-with-fable).
87Fable 5.1 requires Claude Code v2.1.257 or later, and Fable 5 requires v2.1.170 or later. Both require [Fable access](/docs/en/model-config#work-with-fable).
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8989Set the advisor as `fable`, `opus`, or `sonnet`. These aliases resolve to Claude Code's built-in default version for each model family, which advances with new Claude Code releases. You can also pass a full model ID such as `claude-opus-5`.
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