Unverified50% confidenceFactExact time
The default effort (thinking intensity) for Claude Opus 5 is high, whereas Opus 5.5 defaults to medium.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/7/2026
First Seen
Valid until: 1/5/2027
Sources
Related Entities
Related Claims
Unverifiedeffort (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.79% similarVerifiedClaude Opus 5's capabilities are close to the level of the previous-generation flagship Opus, but with significantly reduced inference costs.79% similarUnverifiedIn terminal operation tests, Claude Opus 5.5 performs more strongly.78% 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 4.6.76% similarUnverifiedOpus 5.5 has already reached the level of the previous flagship Faber 5.1 on most tasks.76% similar
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