Claude Opus 5.5 vs Claude Sonnet 5
15 SHARED BENCHMARKSAcross 15 shared benchmarks, Claude Opus 5.5 scores higher on 15 and Claude Sonnet 5 on 0. The widest gap is Terminal-Bench 4.0, where Claude Opus 5.5 scores 66.4 against 12.4. Claude Sonnet 5 is the cheaper of the two on tracked API pricing ($2.00 against $4.00 per million input tokens).
At a glance
Release dates: the vendor's own announcement for Claude Opus 5.5; Artificial Analysis for Claude Sonnet 5. Prices: Artificial Analysis for Claude Opus 5.5; Anthropic's own price page for Claude Sonnet 5. ◆ = independently verified score.
Where each leadsby capability area · benchmark wins
Biggest gaps
Claude Opus 5.5 pulls furthest ahead on
- Humanity's Last Exam67.7 vs 30
- SWE-bench Pro89.9 vs 63.2
- SWE-bench Multilingual93.9 vs 78.3
Claude Sonnet 5 pulls furthest ahead on
No ratified-area lead of 3 points or more.
Every shared benchmark15 · grouped by area
Reasoning 1
Coding 2
Other shared benchmarks 12
Each score is the one the model's own page shows — the most authoritative tracked result for that benchmark, on the benchmark's standard methodology (source-attributed). ↓ marks lower-is-better metrics; ◆ an independently verified score. Open either model for its full surface, provenance and pricing. Quoted rates are the price-setter row we currently track for each model — its direct or vendor-official listing where one exists (direct, anthropic-official), otherwise the lowest tracked offer.