Is Claude Dumb Today?
Daily HumanEvalPlus-CC164 benchmark for Claude Code (Opus 5.5)
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Score
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Model
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Cost
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Runtime
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Score History (last 90 runs)
Where the models disagree
Tasks where Opus 5.5, Opus 5, and Opus 4.8 have different pass rates over recent paired runs.
Green = always passes, red = always fails. Spread is the gap between the best and
worst model on that task — a high spread reveals a real tradeoff, not noise. Historical
divergences include HumanEval/97 (Python signed-modulo quirk) and
HumanEval/141 (Unicode .isalpha() vs literal a–z range).
| Task | Opus 5.5 | Opus 5 | Opus 4.8 | Spread |
|---|---|---|---|---|
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Per-Task Results (latest run)
| Task | Function | Result | Base | EvalPlus | Attempts | Turns | Cost | Error |
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