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arXiv · 2608.10698

EVIL-Detect for NLPCC 2026 Shared Task 6: LLM-Generated Text Detection

Hongrui Bao·Hangyu Rong·Zhuoshang Wang·Yubing Ren·Yanan Cao
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Abstract

The rapid development of large language models (LLMs) has increased the need for reliable detection of LLM-generated text, especially in realistic Chinese scenarios involving human-written text (HWT), LLM-generated text (LGT), and LLM-refined text (HLT). This paper presents EVIL-Detect, a multi-signal ensemble framework with conflict-aware fusion for NLPCC 2026 Shared Task 6. The system integrates edit-extent regression, zero-shot likelihood-contrast signals, lexical statistics, and conservative text rules. With calibrated decision boundaries and conflict-aware integration, our system improves robustness under strong out-of-distribution shifts, achieving a macro-F1 score of 0.8888 and ranking first in the official evaluation. Our code is available at https://github.com/bbbbhrrrr/evildetect.

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Hongrui Bao, Hangyu Rong, Zhuoshang Wang, Yubing Ren, Yanan Cao. 2026-08-11. EVIL-Detect for NLPCC 2026 Shared Task 6: LLM-Generated Text Detection. https://arxiv.org/abs/2608.10698

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