Verdict
GPT-6 Astra leads 9–4 across 14 shared benchmarks.
Claude Fable 5.1 4 · GPT-6 Astra 9 · 1 tied · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Unknown: GPT-6 Astra leads 2–1 across 3 shared unknown benchmarks (largest gap: Mystery Game Puzzles, 82.37 vs 53.73 — protocols undisclosed).
Coding: Evenly split 1–1 across 2 shared coding benchmarks (largest gap: MirrorCode, 73.3 vs 46.7 — protocols undisclosed).
Math: GPT-6 Astra leads 1–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 97.6 vs 87.8 — protocols undisclosed).
Reasoning: GPT-6 Astra leads 2–0 across 2 shared reasoning benchmarks (largest gap: SimpleQA Verified, 75.6 vs 70.8 — protocols undisclosed).
GPT-6 Astra leads 9–4 across 14 shared benchmarks. Claude Fable 5.1 leads 4 benchmarks and GPT-6 Astra leads 9, with 1 tied. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Fable 5.1 and GPT-6 Astra have 14 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
GPT-6 Astra leads reasoning 2–0. GPT-6 Astra leads unknown 2–1.