Grok 4.1 Fast 20.2% Hallucination xAI Worst Model

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Grok-3 vs Grok 4 Comparison: Hallucination Trends and Tradeoffs Hallucination Rates Across Versions As of April 2025, Grok 4.1 reports a hallucination rate hovering around 20.2%, which is notably higher than Grok-3's roughly 13.7%