Claude Code adds advisor mode: Opus 5.5 does the work, Fable 5.2 weighs in on key decisions

Claude Code's advisor feature lets a main model handle routine work while a stronger model is consulted only at pivotal moments, such as planning, recurring errors, and final review. With Opus 5.5 as the main model and Fable 5.2 as advisor, the advisor receives the full conversation, including tool calls and results, and returns guidance that the main model applies, while flagging conflicts with its own evidence. The advisor can be enabled per session with a command, saved as a default in the settings file, or set with a launch flag, and an advisor must rank at or above the main model. Pairings are checked before each request, and Fable may need a one-time consent step on some plans. Claude decides when to consult the advisor, though users can request consultations directly.
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