Unverified50% confidenceBenchmarkExact time
In a comprehensive business test covering dozens of professions and industries, Sonnet 5.5's score is nearly on par with Opus 5.5.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/30/2026
First Seen
Valid until: 12/29/2026
Sources
Related Entities
Related Claims
UnverifiedThe previous-generation Sonnet 4.5 scored 61.4% on the OSWorld Verified benchmark.77% similarPartially VerifiedThe company states that Sonnet 5 shows significant improvements over Sonnet 4.6 in reasoning, tool use, coding, and knowledge work, with overall performance approaching OPUS 4.8 but at a lower price.73% similarVerifiedSonnet 5's Intelligence Index is 6 points higher than Sonnet 4.6's and surpasses Opus 4.8 on agentic knowledge work tasks.73% similarUnverifiedOn the SWE Bench Pro programming benchmark, Sonnet 5 achieved 63.2% and Opus 4.8 achieved 69.2%.72% similar
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