Across 27 shared benchmarks, Gemini 3.8 Flash scores higher on 19 and GPT-5.5 on 8. The widest gap is OmniScience Non-Hallucination, where Gemini 3.8 Flash scores 48.1 against 12. Gemini 3.8 Flash is the cheaper of the two on tracked API pricing ($0.75 against $5.00 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.