Verdict
Claude Opus 5 leads 12–2 across 14 shared benchmarks.
Claude Opus 5 12 · Grok 4.6 2 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: Claude Opus 5 leads 2–1 across 3 shared reasoning benchmarks (largest gap: ARC-AGI, 97.5 vs 87.5 — single evaluator).
Coding: Claude Opus 5 leads 2–0 across 2 shared coding benchmarks (largest gap: DeepSWE, 73.65 vs 67.48 — single evaluator).
Math: Evenly split 1–1 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 73.17 vs 31.71 — single evaluator).
Unknown: Claude Opus 5 leads 2–0 across 2 shared unknown benchmarks (largest gap: ProofBench, 99 vs 51 — single evaluator).
Claude Opus 5 leads 12–2 across 14 shared benchmarks. Claude Opus 5 leads 12 benchmarks and Grok 4.6 leads 2. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Opus 5 and Grok 4.6 have 14 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Claude Opus 5 leads coding 2–0. Claude Opus 5 leads unknown 2–0.