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Why language models hallucinate

OpenAI's new research explains the root cause of hallucinations—and how better evals could fix them.

Reporting by OpenAI Blog 1 min brief
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The KeyNews take

Why it matters

Understanding why language models hallucinate is foundational to building trustworthy AI systems. OpenAI's research into evaluation methodologies directly impacts how companies approach safety and reliability in production deployments.

The key facts

4 to know

  1. OpenAI published research on hallucination mechanisms in LLMs

  2. Study connects improved evaluations to enhanced AI reliability, honesty, and safety

  3. Published September 5, 2025

  4. Addresses fundamental safety and trustworthiness governance question

Go to the source

OpenAI Blogopenai.com

Publisher excerpt: OpenAI’s new research explains why language models hallucinate. The findings show how improved evaluations can enhance AI reliability, honesty, and safety.
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