Verdict
GPT-6.1 Sol leads 9–4 across 14 shared benchmarks.
Claude Fable 5.1 4 · GPT-6.1 Sol 9 · 1 tied · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Unknown: GPT-6.1 Sol leads 3–2 across 5 shared unknown benchmarks (largest gap: Mystery Game Puzzles, 77.97 vs 53.73 — protocols undisclosed).
Math: GPT-6.1 Sol leads 1–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 100 vs 87.8 — protocols undisclosed).
Reasoning: GPT-6.1 Sol leads 2–0 across 2 shared reasoning benchmarks (largest gap: SimpleQA Verified, 73.9 vs 70.8 — protocols undisclosed).
GPT-6.1 Sol leads 9–4 across 14 shared benchmarks. Claude Fable 5.1 leads 4 benchmarks and GPT-6.1 Sol leads 9, with 1 tied. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Fable 5.1 and GPT-6.1 Sol have 14 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
GPT-6.1 Sol leads reasoning 2–0. GPT-6.1 Sol leads unknown 3–2.