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Nicolás Vera Zúñiga

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#artificial intelligence Preprint Sep 2026

Unknown is not normal: separating language-model extraction from rule-based decision logic for clinical risk scores

Large language models (LLMs) are increasingly used to compute clinical risk scores from free-text notes. Notes are often incomplete, and treating undocumented findings as normal can silently misclassify patients. We test whether separating three-state extraction (present, absent or unknown, by an LLM) from decision log...

Nicolás Vera Zúñiga · 0 citations
#natural language process... Preprint Sep 2026

Where a Model Sends Its Own Repeated Token

Black-box model identification works by scoring a model's response to natural-language prompts. One line of work feeds models a degenerate input -- their own token, repeated -- to find a failure mode rather than an identity. We take that input and ask where the model goes when it does not. For each token t, read argmax...

Nicolás Vera Zúñiga · 0 citations
Preprint Aug 2026

What Iterated Self-Feeding Probes of Language Models Measure, and a test that separates the construction from the model

A growing class of methods probes a language model by feeding it its own output: self-consistency, iterated refinement, agentic loops. We ask what such a probe measures, in a construction chosen to make the question sharp: a ring of token cells resampled in place by the model's own windowed conditional p_r(x_i | x_{i+-...

Nicolás Vera Zúñiga · 3 citations
Preprint Aug 2026

Prompt-Model Interaction Reaches the Fixed Points: A deterministic, task-free structural readout -- and the factorizations of it that failed

That a prompt's effect is not a property of the prompt is established: prompts optimised for one model degrade on another, and rankings reorder under neutral reformatting. That evidence is about task accuracy, which cannot say whether the interaction is a fact about task machinery or about the conditional distribution...

Nicolás Vera Zúñiga · 1 citation · ⚡1

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