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OpenAI

MentalHealthBench: An Open Benchmark for Realistic Mental Health Conversations

This work co-created MentalHealthBench, an open benchmark built with more than 80 licensed mental health experts from 22 countries, using privacy-preserving techniques to generate synthetic mental health conversations that span non-acute, high-acuity, and emergency situations and four user personas (adults, teens aged 13-17, caregivers, and clinicians), with experts writing rubric criteria weighted from -10 to +10 (each conversation reviewed by at least three experts, retaining only criteria agreed by at least two and not contradicted by a third) and an automated grader, GPT-5.