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Incident

Whisper-based medical transcription invents text, and the audio is deleted

Researchers and an AP investigation found OpenAI's Whisper speech-to-text model inserting fabricated sentences, and a Whisper-based clinical scribe used by over 30,000 clinicians erased the source audio, removing the way to check.

Sources checked when written 26 September 2026

What happened

A peer-reviewed FAccT 2024 study found about 1% of Whisper transcriptions contained whole phrases or sentences absent from the audio, 38% of which included explicit harms such as violent content, false associations or implied false authority; rates were higher for speakers with aphasia and long pauses. In October 2024 the Associated Press reported that over 30,000 clinicians and 40 health systems had adopted a Whisper-based tool from Nabla, used for about 7 million visits, despite OpenAI's warning against use in high-risk domains. Nabla's tool erased the original audio for data-safety reasons, so transcripts could not be compared with the recording; the company said providers must edit and approve notes.[1,2]

Documented harm

No specific patient harm documented in the cited sources; risk is erroneous content in medical records.

What it teaches

Sources

  1. Careless Whisper: Speech-to-Text Hallucination Harms. ACM FAccT 2024 (Koenecke A, Choi ASG, Mei KX, Schellmann H, Sloane M); arXiv 2402.08021, June 2024. Primary Peer-reviewed · link checked 2026-09-26
  2. Researchers say an AI-powered transcription tool used in hospitals invents things no one ever said. Associated Press (syndicated via Scripps News), 26 October 2024. Secondary Journalism · link checked 2026-09-26

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