CONCEPT
Fluent Fabrication
The specific AI failure mode in which the output is eloquent, well-structured, and confidently wrong — the category of error whose detection requires domain expertise precisely at the moment when the tool's speed tempts builders to bypass it.
Fluent fabrication names the category of AI-generated error that presents with the surface markers of correctness — coherent structure, appropriate vocabulary, plausible specificity — while being substantively wrong. Segal's clearest example in You On AI was a Claude-generated reference to Gilles Deleuze: a specific philosophical concept attributed to a specific work, in prose that read as genuine insight, except the attribution was wrong in a way only a Deleuze reader could detect. The fabrication is dangerous not because it is unusual but because it is fluent. The surface cues humans use to estimate text reliability — coherence, confidence, specificity — were calibrated on human writers whose fluency correlated with competence. For AI systems, that correlation breaks.
In The You On AI Field Guide
Gawande's medical analog is the surgical complication that looks like a success. The bile duct clipped during laparoscopic cholecystectomy looks, on the operative field, exactly like the cystic duct that was supposed to be clipped. The
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