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Introducing MentalHealthBench

OpenAI announces MentalHealthBench, an open benchmark of synthetic mental health conversations (adults, teens, caregivers, clinicians; multiple languages) spanning non-acute, high-acuity and emergency cases. More than 80 licensed psychologists and psychiatrists from 22 countries wrote weighted rubric criteria (-10 to +10), retained only with at least two-expert agreement, and GPT-5.6 Sol grades responses across ten behavior dimensions such as safety, seeking context, preserving user agency and actionable guidance. A companion study with 44 adult users compared user and expert preferences, finding users value practical next steps and tone more while experts stress context gathering.