Verdict
Claude Sonnet 5.5 leads 12–1 across 13 shared benchmarks.
Claude Sonnet 5.5 12 · Gemini 3.8 Flash 1 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: Claude Sonnet 5.5 leads 2–1 across 3 shared reasoning benchmarks (largest gap: SimpleQA Verified, 69.7 vs 46.5 — protocols undisclosed).
Unknown: Claude Sonnet 5.5 leads 3–0 across 3 shared unknown benchmarks (largest gap: Furniture Assembly, 64.29 vs 2.38 — protocols undisclosed).
Coding: Claude Sonnet 5.5 leads 2–0 across 2 shared coding benchmarks (largest gap: FrontierSWE, 61.89 vs 19.63 — single evaluator).
Math: Claude Sonnet 5.5 leads 2–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 80.49 vs 21.95 — protocols undisclosed).
Claude Sonnet 5.5 leads 12–1 across 13 shared benchmarks. Claude Sonnet 5.5 leads 12 benchmarks and Gemini 3.8 Flash leads 1. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Sonnet 5.5 and Gemini 3.8 Flash have 13 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Claude Sonnet 5.5 leads unknown 3–0. Claude Sonnet 5.5 leads coding 2–0.