Claude Opus 5.5 vs GPT-6 Astra
30 SHARED BENCHMARKSAcross 30 shared benchmarks, Claude Opus 5.5 scores higher on 20 and GPT-6 Astra on 8, with 2 level. The widest gap is GDPVal, where Claude Opus 5.5 scores 67.3 against 52.1. Claude Opus 5.5 is the cheaper of the two on tracked API pricing ($4.00 against $10.00 per million input tokens).
At a glance
Release dates: the vendor's own announcement for Claude Opus 5.5; Artificial Analysis for GPT-6 Astra. Prices: Artificial Analysis for Claude Opus 5.5; Artificial Analysis for GPT-6 Astra. ◆ = independently verified score.
Where each leadsby capability area · benchmark wins
Biggest gaps
Claude Opus 5.5 pulls furthest ahead on
- GDPVal67.3 vs 52.1
- LiveBench · Agentic Coding71.7 vs 57.3
- SciCode66.9 vs 56.5
GPT-6 Astra pulls furthest ahead on
- AA IT-Bench SRE48.6 vs 38.2
- AA-Omniscience · Non-hallucination48.7 vs 41.4
- LiveBench · Instruction Following75.6 vs 65.7
Every shared benchmark30 · grouped by area
Reasoning 5
Coding 4
Agentic 3
Factuality 2
Instruction Following 1
Long Context 1
Math 1
Multimodal 1
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, direct), otherwise the lowest tracked offer.