LLM has revolutionized NLP and AI tasks, and factual knowledge plays a particularly crucial role. This paper deeply analyzes the factual knowledge of state-of-the-art LLM using GPTKB v1.5 (100 million knowledge bases) based on GPT-4.1. We find that its accuracy is lower than previous benchmarks, it differs significantly from existing knowledge bases, and it suffers from major issues such as inconsistency, ambiguity, and illusions.