Uploaded September 2025 | Updated September 2026, 2 weeks ago

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In this video I will look at why LLMs hallucinate. LLMs hallucinate not because they’re “broken,” but because today’s training and accuracy-only evaluations incentivize guessing. This is based on a new research from OpenAI.

openai.com/index/why-language-models-hallucinate
cdn.openai.com/pdf/d04913be-3f6f-4d2b-b283-ff432ef4aaa5/why-language-models-hallucinate.pdf
claude.ai/public/artifacts/557007ce-c731-460e-b6ea-152718774cca
claude.ai/public/artifacts/9f1238f1-0efc-4880-974a-29d1f42029b3
claude.ai/public/artifacts/67698ee1-18a9-4251-b408-83c0876015eb
claude.ai/public/artifacts/606fc46e-9750-4d27-9f48-633cb0cff7eb

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TIMESTAMP

00:00 Hallucinations in Language Models
00:48 How Language Models Work
02:26 The Issue with Next Word Prediction
02:50 Evaluation Mechanisms and Their Flaws
04:11 Proposed Solutions to Mitigate Hallucinations
07:16 Observations and Claims from OpenAI's Paper