Group size effects and collective misalignment in LLM multi-agent systems

Ariel Flint Ashery, Luca Maria Aiello, Romualdo Pastor-Satorras, Andrea Baronchelli · 2025 · arXiv; PNAS 2026 (per listing)

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Group interaction can amplify an individual bias, create a new one, or override a model’s own preference. Population size changes the outcome non-linearly, and beyond a critical size collective outcomes become deterministic.

Questions it bears on

• Aligned alone misaligned together
• From individual psychology to collective behavior