Claude vs. ChatGPT: Accuracy, Hallucination Rates Compared

When comparing AI assistants, Claude's Fable 5 model is marginally more accurate than ChatGPT's 5.6 Sol model, scoring 61 percent versus 59 percent on the AA-Omniscience Accuracy benchmark. However, for mid-tier models, ChatGPT 5.6 Terra scores higher at 46 percent, while Claude Sonnet 5 scores 38 percent. What's more significant is Claude's lower hallucination rate. Claude's Fable 5 model scores 55 percent compared to ChatGPT 5.6 Sol's 89 percent. In mid-tier models, Claude Sonnet 5 scores 37 percent, while ChatGPT 5.6 Terra scores 85 percent, where a lower score is better. The bottom line is that while both tools offer similar everyday functions, their accuracy and tendency to "hallucinate" can differ depending on the specific model used.