ChatGPT Hallucinates Responses to Empty Queries

There is a bug in ChatGPT that allows it to generate responses without receiving any query input, indicating it may be hallucinating or taking context from elsewhere.


  • The issue enables ChatGPT to produce responses without receiving a query input from the user.
  • This bug has persisted since last year and is still working currently.
  • It is unknown what context ChatGPT is taking to generate these hallucinated responses.
  • To reproduce, first send a query, then clear the query input and send empty queries to see hallucinated responses.
  • The responses contain detailed instructions, like for using the DALL-E image generation tool, not just basic default messages.
  • It does not seem to be caused by any custom instructions, as turning those off does not resolve the issue.
  • Some speculation that it relates to how ChatGPT handles empty input through tokenization and attention mechanisms rather than as a lack of query.
  • Similar issues seen with other models when given non-queries, like endless repeated words.
  • The randomness indicates it relates to high token sampling parameters rather than intentional training.
  • It persists even when temperature settings are adjusted, indicating a core issue with handling empty inputs.


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