Verdict
Claude Opus 5.5 leads 8–3 across 12 shared benchmarks.
Claude Opus 5.5 8 · Gemini 4 Argon 3 · 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 3–0 across 3 shared unknown benchmarks (largest gap: Furniture Assembly, 76.19 vs 60.71 — protocols undisclosed).
Coding: Claude Opus 5.5 leads 2–0 across 2 shared coding benchmarks (largest gap: FrontierSWE, 62.33 vs 54.96 — single evaluator).
Math: Claude Opus 5.5 leads 1–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 95 vs 78.05 — protocols undisclosed).
Reasoning: Gemini 4 Argon leads 2–0 across 2 shared reasoning benchmarks (largest gap: GPQA diamond, 95.2 vs 87.46 — protocols undisclosed).
Claude Opus 5.5 leads 8–3 across 12 shared benchmarks. Claude Opus 5.5 leads 8 benchmarks and Gemini 4 Argon leads 3, with 1 tied. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Opus 5.5 and Gemini 4 Argon have 12 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 3–0. Claude Opus 5.5 leads coding 2–0.