ResearchBenchmarksWatermarking on LongformFollow21.9Generation MetricSimplex21.161621.353321.54521.7367May 9, 2026Evaluation ResultsMethodMethodLinksGeneration MetricPercentage Drop in Generation Metric-log10 p-valueSimplex2026.0521.9-4.1864.985HeavyWater2026.0521.48-2.1888.089Inv. Tr.2026.0521.27-1.1893.687RGdelta=1delta=12026.0521.25-1.0941.456Gumbel2026.0521.2-0.8568.006RGdelta=3delta=32026.0521.19-0.8097.078