Unverified50% confidenceBenchmarkExact time
On Cursor Bench, Sonnet 5.5's best score is only about two points behind Opus 5.5
1
Sources
50%
Confidence
Long-term
Relevance
9/30/2026
First Seen
Sources
Related Entities
Related Claims
VerifiedSonnet 5 achieved a score of 80.4% on Terminal Bench 2.1, approaching Opus 4.8.78% similarVerifiedSonnet 5's Intelligence Index is 6 points higher than Sonnet 4.6's and surpasses Opus 4.8 on agentic knowledge work tasks.78% similarUnverifiedUnder the highest difficulty settings of Terminal Bench 4.0, Sonnet 5.5 outperforms Opus 5.5.77% similarUnverifiedIn agentic search tests, Sonnet 5 outperformed Sonnet 4.6 across all effort levels, but its overall performance was below Opus 4.8, placing it at approximately the Opus 4.7 level overall.76% similarUnverifiedSonnet 5.5 and Opus 5.5 have the same cache read price, while Sonnet 5.5 is approximately half the price on all other items.75% similar
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