Claude Opus 5.5 vs GPT-5.5
33 SHARED BENCHMARKSAcross 33 shared benchmarks, Claude Opus 5.5 scores higher on 29 and GPT-5.5 on 4. The widest gap is Terminal-Bench 4.0, where Claude Opus 5.5 scores 59.6 against 14.6. Claude Opus 5.5 is the cheaper of the two on tracked API pricing ($4.00 against $5.00 per million input tokens).
At a glance
Release dates: the vendor's own announcement for Claude Opus 5.5; Artificial Analysis for GPT-5.5. Prices: Anthropic's own price page for Claude Opus 5.5; Artificial Analysis for GPT-5.5. ◆ = independently verified score.
Where each leadsby capability area · benchmark wins
Biggest gaps
Claude Opus 5.5 pulls furthest ahead on
- Terminal-Bench 4.059.6 vs 14.6
- AA-Omniscience · Non-hallucination41.4 vs 11
- GDPVal67.3 vs 41.8
GPT-5.5 pulls furthest ahead on
- AA IT-Bench SRE45.8 vs 38.2
- LiveBench · Instruction Following70.7 vs 65.7
Every shared benchmark33 · grouped by area
Reasoning 5
Coding 5
Agentic 3
Factuality 2
Instruction Following 1
Long Context 1
Math 1
Multimodal 1
Other shared benchmarks 14
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 (anthropic-official, direct), otherwise the lowest tracked offer.