Fable 5.1 Takes the Debate Benchmark Crown With Field-Leading Rebuttals
zero0_one1 · reddit · 2026-09-06
Claude Fable 5.1 is the new champion of the Debate Benchmark, which tests models' ability to defend positions through sustained adversarial multi-turn debates across hundreds of topics, with PRO/CON swapped per motion and three judges from distinct model families. Fable 5.1 engaged directly in 299/302 debates with a field-leading 8.10 mean rebuttal score (+0.71). Profiles: GPT-6 Astra is an epistemically careful burden-focused specialist weak on rhetoric; GLM-5.3 (high) shows strong rebuttal and originality; Muse Spark 1.3 leads rhetorical effectiveness at 8.17 (+0.51); Gemini 3.8 Flash has a consistent rebuttal-specificity deficit; Tencent Hy4 Preview is disciplined but occasionally blunt.
Related event: Claude Fable 5.1 Tops LLM Debate Benchmark, GLM-5.3 Debuts in Top Four(2 posts)→
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