ToM-SSI: Evaluating Theory of Mind in Situated Social Interactions

• URL: http://arxiv.org/abs/2509.05066v2
• Date: Tue, 16 Sep 2025 12:22:34 GMT
• Title: ToM-SSI: Evaluating Theory of Mind in Situated Social Interactions
• Authors: Matteo Bortoletto, Constantin Ruhdorfer, Andreas Bulling,
• Abstract summary: ToM-SSI is a new benchmark specifically designed to test ToM capabilities in environments rich with social interactions and spatial dynamics.<n>This unique design allows us to study, for the first time, mixed cooperative-obstructive settings and reasoning about multiple agents' mental state in parallel.
• Score: 17.2191603793837
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Most existing Theory of Mind (ToM) benchmarks for foundation models rely on variations of the Sally-Anne test, offering only a very limited perspective on ToM and neglecting the complexity of human social interactions. To address this gap, we propose ToM-SSI: a new benchmark specifically designed to test ToM capabilities in environments rich with social interactions and spatial dynamics. While current ToM benchmarks are limited to text-only or dyadic interactions, ToM-SSI is multimodal and includes group interactions of up to four agents that communicate and move in situated environments. This unique design allows us to study, for the first time, mixed cooperative-obstructive settings and reasoning about multiple agents' mental state in parallel, thus capturing a wider range of social cognition than existing benchmarks. Our evaluations reveal that the current models' performance is still severely limited, especially in these new tasks, highlighting critical gaps for future research.

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