Unverified50% confidenceFactExact time
effort (reasoning intensity) is the primary control for adjusting the amount of reasoning in Opus 5.5; its default value is medium, and its performance at that level can match or even exceed Opus 5 at high intensity.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/28/2026
First Seen
Valid until: 12/27/2026
Sources
Related Entities
Related Claims
UnverifiedOpus is the flagship model with the largest parameter scale and the strongest reasoning depth and long-text processing capability, but with relatively slower response speed and the highest call cost.68% similarUnverifiedOpus 5's pass rate at Low Effort is approximately 60%, surpassing Opus 4.8's 59% at the Max level, for which the per-task cost is as high as $13.67% similarUnverifiedIn a test using the same prompt to create a knight sprite, Fable 5 and Opus 5 showed significant differences in depth of task understanding and delivery standards.67% similarVerifiedClaude Opus 5's capabilities are close to the level of the previous-generation flagship Opus, but with significantly reduced inference costs.65% similarUnverifiedOpus 5.5 is the first version with targeted improvements to sentence clarity and information overload, but the engineer emphasized this does not mean Opus 5.5 has comprehensively surpassed Opus 4.6.64% similar
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