#chatgpt accuracy

GPT-5.5 Breaks the Accuracy Record. It Also Has an 86% Hallucination Rate. Here's Why Both Are True.

Independent benchmarking found GPT-5.5 achieves 57% accuracy on the AA-Omniscience benchmark, the highest ever recorded for any ChatGPT model. The same study found an 86% hallucination rate on citation-sensitive tasks. For brands with thin training data coverage, GPT-5.5 is more likely to fabricate a brand description than any prior model in the GPT lineup.