Unverified50% confidenceBenchmarkExact time
Claude Opus 5.5 achieved a perfect 20-out-of-20 score on only 241 of the 507 tasks, for a 20-of-20 reliability of 47.53%.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/11/2026
First Seen
Valid until: 1/9/2027
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