Verdict
Claude Opus 5.5 leads 15–1 across 17 shared benchmarks.
Claude Opus 5.5 15 · Gemini 3.8 Flash 1 · 1 tied · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Unknown: Claude Opus 5.5 leads 5–0 across 5 shared unknown benchmarks (largest gap: Furniture Assembly, 76.19 vs 2.38 — protocols undisclosed).
Reasoning: Evenly split 1–1 across 3 shared reasoning benchmarks (largest gap: GPQA diamond, 93.86 vs 87.46 — protocols undisclosed).
Agentic: Claude Opus 5.5 leads 2–0 across 2 shared agentic benchmarks (largest gap: Remote Labor Index, 21.25 vs 5.83 — protocols undisclosed).
Coding: Claude Opus 5.5 leads 2–0 across 2 shared coding benchmarks (largest gap: FrontierSWE, 62.33 vs 19.63 — single evaluator).
Math: Claude Opus 5.5 leads 2–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 95 vs 21.95 — protocols undisclosed).
Claude Opus 5.5 leads 15–1 across 17 shared benchmarks. Claude Opus 5.5 leads 15 benchmarks and Gemini 3.8 Flash leads 1, with 1 tied. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Opus 5.5 and Gemini 3.8 Flash have 17 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Claude Opus 5.5 leads unknown 5–0. Claude Opus 5.5 leads agentic 2–0.