Verified65% confidenceBenchmarkExact time
On the SWE-Bench Pro benchmark, Sonnet 5 significantly trails Opus 4.8.
3
Sources
65%
Confidence
Medium-term (~90 days)
Relevance
7/22/2026
First Seen
Valid until: 10/20/2026
Sources
Related Claims
VerifiedOn the SWE Bench Pro programming benchmark, Sonnet 5 achieved 63.2% and Opus 4.8 achieved 69.2%.80% similarUnverifiedUnder the highest difficulty settings of Terminal Bench 4.0, Sonnet 5.5 outperforms Opus 5.5.79% similarUnverifiedOn the third-party benchmark Frontier Code launched by Cognition, Sonnet 5 surpasses Opus 4.878% similarVerifiedThe 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.77% similar
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