Opus 5 allegedly produced these outputs
Summary
Rumored outputs from an AI model called Opus 5 have surfaced, but their authenticity is unconfirmed.
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Opus 5's effort dial is not monotonic. Above "high", coding scores go down, and Anthropic's own migration guide says so.
Anthropic's Opus 5 shows non-monotonic performance on coding tasks; the 'high' effort setting outperforms 'max' due to unnecessary refactors. The model also has a 6% higher hallucination rate than Opus 4.8, and safety classifiers may silently fall back to the older model.