GPT-5.5 hallucinates 3x more than MIT-licensed GLM-5.2

GPT-5.5 was found to hallucinate 3x more than MIT-licensed GLM-5.2, a comparison of two AI models. This matters because it highlights differences in model behavior and potential reliability issues. Engineers should be aware of these discrepancies when selecting AI models for use in their projects. Further research is needed to understand the implications of these findings.