Dev comparison: Fable 5.1 outplans Opus 5.5 on system design

cryogen2dev · reddit · 2026-09-28

Reddit user cryogen2dev reports Fable 5.1 is markedly better at system design, considering future consequences of current decisions, while Opus 5.5 excels as an executor rather than a planner. Their workflow: use Fable for debugging hard problems and long-term design, Opus for implementing the plan — a practical two-model split worth copying.

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