GPT-6 Luna system card addendum updates MentalHealthBench results
AI summary
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.
In-depth insight
The table compares GPT-6 Luna with several other model versions across MentalHealthBench categories and reports task-level means with one standard error.
Table 6: MentalHealthBench scores, computed using the task-clipped metric. Values show the mean task-level score ± one standard error across tasks, with four responses per task. Scores are on a 0--100 scale; higher is better.
| 1 Evaluation | gpt-5.5Instant(May) | gpt-5.5Instant(June) | gpt-5.6-sol(August) | gpt-5.6-luna(August) | gpt-6-sol(October 7) | gpt-6-luna(October 7) | gpt-6-luna(October 29) |
|---|---|---|---|---|---|---|---|
| MentalHealthBench (overall) | 49.38 ± 0.93 | 53.93 ± 0.93 | 47.53 ± 0.97 | 45.11 ± 0.95 | 48.81 ± 0.97 | 51.73 ± 0.96 | 48.68 ± 0.97 |
| MentalHealthBench (non-acute) | 51.91 ± 1.23 | 52.96 ± 1.26 | 47.07 ± 1.30 | 43.10 ± 1.29 | 47.62 ± 1.31 | 51.68 ± 1.28 | 46.39 ± 1.29 |
| MentalHealthBench (high acuity) | 50.23 ± 2.17 | 58.76 ± 2.11 | 53.88 ± 2.28 | 52.58 ± 2.19 | 53.70 ± 2.26 | 56.15 ± 2.25 | 53.92 ± 2.28 |
| MentalHealthBench (emergent) | 44.03 ± 1.80 | 52.66 ± 1.81 | 44.30 ± 1.87 | 44.12 ± 1.81 | 47.92 ± 1.89 | 48.98 ± 1.87 | 49.64 ± 1.87 |
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