Dev postmortem on Opus-reviewed fixes: ~1/3 accepted as-is, blind trust would've been horrible

Vjeux · x · 2026-11-13

Mediabunny author vanilagy shares a postmortem on having Opus 5.5 handle nearly 400 fixes. Key takeaways:

Only about a third of fixes went in unchanged, usually the smaller ones; many left ugly/bloated/repeated/inefficient code, made wrong architectural assumptions or design decisions, or fixed bugs at the wrong level.
Deciding what even counts as a bug and how the system should behave is something only he, as the project's direction-setter, could add — Opus flagged many issues without fixing them because they required his inspection.
Opus 5.5 is still "wicked smart," and there are areas he'd blindly trust it.

Core lesson: the better the fixes match your judgment, the more dangerous it is to relax your review discipline.

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