davidad: Opus 4.6 is the most capable Claude supporting temp=0
davidad · x · 2026-08-22
Safety researcher davidad compared Claude Opus 5 vs Opus 4.6: running Opus 5 with effort=high and thinking=off reaches right answers faster than with thinking on, but "constantly oops-ing all over the place." Opus 4.6 with the same settings plus temp=0 has a lower capability ceiling but far fewer blunders, making it his pick for some use cases.
Related event: Tests Show Opus 5 Faster Without Thinking but Prone to Errors(4 posts)→
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