OpenAI GPT-5.6 Launch - PostTrainBench Lite: leaderboard
PostTrainBench Lite row of the self-improvement table in OpenAI's GPT-5.6 launch post (2026-07-09), a reduced version of PostTrainBench, in which agents post-train language models. Score in percent, higher is better; GPT-5.6 Sol, Terra, Luna and GPT-5.5 only.
Metric: Score (%). Source: openai.com. Saturation forecast: Around April 2027. 4 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | GPT-5.6 Terra | 51.5 | #40 |
| 2 | GPT-5.6 Sol | 50.3 | #22 |
| 3 | GPT-5.5 | 38.8 | #33 |
| 4 | GPT-5.6 Luna | 29.6 | #79 |
No result here: #3 Claude Opus 5.5, #6 GPT-6 Astra, #7 GPT-6.1 Sol.
Interactive version: theaggregate.ai/benchmark?slug=openai-gpt-5-6-launch-posttrainbench-lite · How It Works · Data refreshed daily, snapshot 2026-11-05.