Opus 5 Test: Thinking-Off Mode Faster But Prone to Hallucinations
davidad · x · 2026-08-22
User testing reveals that Opus 5 in effort=high and thinking=off mode reaches correct answers faster than with thinking on, but frequently produces embarrassing errors. In contrast, Opus 4.6 with the same settings has a lower capability ceiling but significantly fewer hallucinations.
Related event: Tests Show Opus 5 Faster Without Thinking but Prone to Errors(4 posts)→
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