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Is Claude Opus 5.5 Nerfed? Claude Code Ignores Your effortLevel. How to Fix It

One Hacker News commenter says their Fable workflows went from a "~85%" success rate to "~10%" about two weeks ago. Another says Opus 5.5 is "suddenly fumbling basic tool calls" and failing to finish tasks even at high effort. A third says nothing happened at all: "It's just a new summarizer, the m…

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  1. 2026-11-09 17:50 · DEV Community — AI
    Is Claude Opus 5.5 Nerfed? Claude Code Ignores Your effortLevel. How to Fix It

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