Inverse Turing Bench: Evaluating Language Models as Judges of Human vs. AI Dialogue

Title:Inverse Turing Bench: Evaluating Language Models as Judges of Human vs. AI Dialogue

Abstract:As AI systems integrate into online spaces, differentiating them from humans in conversations is increasingly important. We present Inverse Turing Bench, a benchmark that evaluates LLMs and other models on their ability to differentiate humans and AI in multi-turn text. The benchmark provides a collection of paired dialogue transcripts, wherein one dialogue is between two humans and the other is between a human and an AI. The task is to correctly identify which dialogue is human-only vs. human-AI. We evaluated a preliminary set of models against this benchmark, and found that GPTZero, Claude Opus-4.6, and GPT-5.5 achieve the highest accuracy: 89.41%, 77.92%, and 75.94% respectively. Our results suggest that statistical approaches to detection have semantic blind spots, but semantic approaches are susceptible to persona-prompting. Our work speaks to the Inverse Turing Test and motivates human-AI differentiation as a critical capability for AI systems. Our live benchmark can be found at this https URL.

Computation and Language (cs.CL); Computers and Society (cs.CY)

arXiv:2606.21844 [cs.CL]

(or arXiv:2606.21844v2 [cs.CL] for this version)

https://doi.org/10.48550/arXiv.2606.21844 Focus to learn more arXiv-issued DOI via DataCite

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