Verdict
GPT-5.4 Pro leads 3–1 across 4 shared benchmarks.
GPT-5.4 Pro 3 · Muse Spark 1 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: GPT-5.4 Pro leads 2–1 across 3 shared reasoning benchmarks (largest gap: SimpleQA Verified, 66.3 vs 47.8 — single evaluator).
GPT-5.4 Pro leads 3–1 across 4 shared benchmarks. GPT-5.4 Pro leads 3 benchmarks and Muse Spark leads 1. Higher isn't always better — see the integrity caveats on each benchmark.
GPT-5.4 Pro and Muse Spark have 4 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
GPT-5.4 Pro leads reasoning 2–1.