Move by Move: Measuring and Steering How LLMs Conduct Psychotherapy

• URL: http://arxiv.org/abs/2608.21325v1
• Date: Fri, 21 Aug 2026 17:32:38 GMT
• Title: Move by Move: Measuring and Steering How LLMs Conduct Psychotherapy
• Abstract summary: We introduce an ontology of ten therapeutic moves, validated through an annotation campaign with five licensed psychologists.<n>Applying it to real counseling transcripts and model-led sessions, we compare the move distributions between human clinicians and a panel of frontier models.<n>Models over-use inquiry at up to three times the human rate, neglect psychoeducation, and are strongly context-anchored.
• Score: 5.950325513496238
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Users increasingly turn to large language models for emotional support, yet little is known about how these models actually conduct a psychotherapy interaction. We introduce an ontology of ten therapeutic moves: compact, function-based categories grounded in the MULTI-60 inventory, validated through an annotation campaign with five licensed psychologists, and scaled with a judge-based approach that matches expert agreement. Applying it to real counseling transcripts and model-led sessions, we compare the move distributions between human clinicians and a panel of frontier models. Models over-use inquiry at up to three times the human rate, neglect psychoeducation, and are strongly context-anchored: they carry forward strategies initiated by a human clinician but rarely initiate them themselves. Exposing the ontology as a set of tools roughly halves the mean deviation from the human move distribution and improves turn-level alignment with human therapist by 7-9 percentage points, without any fine-tuning.

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