Machine Heart

Nov 8, 2026 · Artificial Intelligence

AI's Mandela Effect: How Fabricated Beliefs Spread Across Multi-Agent LLM Networks

Researchers simulated a multi-agent social network where a malicious agent injects false statements; all 10 tested LLMs — including GPT-5.5, Claude, Gemini, Qwen, and Llama — gradually accepted fabricated claims, which persisted after the attacker left and biased downstream recommendations.