Verdict
Claude Opus 4.5 leads 17–0 across 17 shared benchmarks.
Claude Opus 4.1 0 · Claude Opus 4.5 17 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: Claude Opus 4.5 leads 4–0 across 4 shared reasoning benchmarks (largest gap: HLE, 21.43 vs 7.06 — protocols undisclosed).
Unknown: Claude Opus 4.5 leads 3–0 across 3 shared unknown benchmarks (largest gap: METR Time Horizons, 74.97 vs 66.81 — single evaluator).
Math: Claude Opus 4.5 leads 2–0 across 2 shared math benchmarks (largest gap: OTIS Mock AIME 2024-2025, 86.1 vs 68.86 — single evaluator).
Claude Opus 4.5 leads 17–0 across 17 shared benchmarks. Claude Opus 4.1 leads 0 benchmarks and Claude Opus 4.5 leads 17. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Opus 4.1 and Claude Opus 4.5 have 17 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Claude Opus 4.5 leads reasoning 4–0. Claude Opus 4.5 leads unknown 3–0.