PhantomFill: When the Form Demands an Answer, Language Models Invent One
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arXiv:2607.20492v1 Announce Type: new Abstract: Language models in production do not write prose. They fill forms: JSON fields, function arguments, extraction templates. We show that the form itself causes hallucination. We ask thirteen models the same question about the same input and change only the answer format. The inputs are built so the question cannot be answered: a viral post showing 12,400 likes but no visible replies, a support ticket whose call was never transcribed. In free text,…
1Key Takeaways
- arXiv:2607.20492v1 Announce Type: new Abstract: Language models in production do not write prose.
- They fill forms: JSON fields, function arguments, extraction templates.
- We show that the form itself causes hallucination.
- We ask thirteen models the same question about the same input and change only the answer format.
2AIWedia Score
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3Why it matters
Research breakthroughs often arrive in products months later—early signals matter for strategy. arXiv ML reports that arXiv:2607.20492v1 Announce Type: new Abstract: Language models in production do not write prose.
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