I Tried to Catch 5 AIs Favoring Themselves. Only Some Did.
GPT-5.6 Sol exhibited the strongest self-preference bias, scoring its own essay +1.49 points above the peer average. DeepSeek V4 Pro showed moderate self-preference (+0.55), while Claude Fable 5 was perfectly calibrated (gap of -0.01). Grok-4.5 and Gemini 3.1 Pro demonstrated mild self-criticism, scoring their own work lower than the peer average. The experiment highlights that not all Large Language Models (LLMs) exhibit universal self-vanity when grading their own outputs blind.
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