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Mohit Iyyer

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#machine learning Preprint Sep 2026

How Much Is an AI Token Worth? Scaling Laws for Wild AI-Generated Web Text

Web text makes up the majority of pretraining data and is increasingly AI-generated. After applying FineWeb quality filtering, we find that 27.5% of tokens from June 2026 web data are labeled as AI-generated by Pangram, rising to 31.1% by August. Unlike synthetic data or model-collapse setups, this *wild* AI text comes...

Jenna Russell, Ben Glickenhaus, Katherine Thai et al. · 0 citations

OverThink: Slowdown Attacks on Reasoning LLMs

This work evaluates Overthink on proprietary and open-source reasoning models across the FreshQA, SQuAD, and MuSR datasets, and shows that newer generations of RLMs, while showing a drastic increase in per-token cost, also exhibit up to a 2.3x increase in reasoning tokens, leaving them more vulnerable to Overthink atta...

Abhinav Kumar, Jaechul Roh, Ali Naseh et al. · 92 citations · ⚡9

POLARIS: Guiding Small Models to Write Long Stories

The results suggest that length generalization is a meaningful stress test for creative-writing models and a useful lens for distinguishing otherwise close models.

Rishanth Rajendhran, Jenna Russell, Mohit Iyyer et al. · 1 citation
Review

AutoFiction : Measuring AI ability to execute long-horizon writing tasks

Initial human feedback reveals that AI-written novels contain interesting descriptions and concepts, but often fail in long-range coherence and prose quality, including conceptual repetition, distracting details, and weak dialogues.

Chau Minh Pham, Yapei Chang, Mohit Iyyer · 0 citations

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