GPT-5.5 Instant
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- GPT-6 Luna system card addendum updates MentalHealthBench results
An October 29, 2026 addendum to the GPT-6 Luna System Card reports MentalHealthBench results for the October 29 version. The model scored 48.68 overall, 46.39 on non-acute cases, 53.92 on high-acuity cases and 49.64 on emergent cases. Scores use the task-clipped metric on a 0–100 scale, where higher is better, and are based on four responses per task. The supplied report does not explain what changed between the October 7 and October 29 versions.
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