Across 29 shared benchmarks, Gemini 3.5 Flash scores higher on 4 and GPT-6 Astra on 25. The widest gap is frontiermath_tier_4, where GPT-6 Astra scores 97.6 against 26.8. Gemini 3.5 Flash is the cheaper of the two on tracked API pricing ($1.50 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 (google-official, direct), otherwise the lowest tracked offer.