Across 25 shared benchmarks, GPT-5 scores higher on 0 and GPT-6 Astra on 25. The widest gap is critpt, where GPT-6 Astra scores 31.7 against 5.7. GPT-5 is the cheaper of the two on tracked API pricing ($1.25 against $10.00 per million input tokens).
Best tracked score per model per benchmark (default configuration; source-attributed). ↓ marks lower-is-better metrics. 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.