New LLM Persuasion Benchmark: 6,296 Conversations Across 15 Models — GPT-5.4 Strongest Persuader, MiMo V2 Pro Softest Target

r/singularity / GitHub·medium signal

Researcher lechmazur published a round-robin persuasion benchmark where LLMs attempt to shift each other's stated positions across 15 topics in multi-turn conversations. GPT-5.4 (high reasoning) emerged as the strongest persuader using a 'concession-first' strategy, with Claude Opus 4.6 forming a close second tier alongside ByteDance Seed2.0 Pro. On defense, Grok 4.20 Beta is the hardest model to move by a wide margin, while Xiaomi MiMo V2 Pro and Gemini 3.1 Pro Preview are the softest targets, absorbing large stance shifts.