Model record
GPT-5.6 Luna model overview
GPT-5.6 Luna is a api + app model from OpenAI. It was released on July 9, 2026. Its strongest case is lowest gpt-5.6 list price, while buyers should account for lower peak reasoning than sol and terra.
GPT-5.6 Luna benchmark snapshot
| Evaluation | Reported score | What it probes |
|---|---|---|
| MMLU-Pro | Not reported | Broad knowledge and multi-step reasoning |
| GPQA Diamond | 92.3 | Graduate-level science reasoning |
| SWE-bench Verified | Not reported | Verified real-repository issue resolution |
| LiveCodeBench | Not reported | Contamination-aware competitive programming |
| SWE-Bench Pro | 62.7 | Longer, harder professional software tasks |
| Artificial Analysis Intelligence Index | 51.2 | Composite third-party capability index; version matters |
Scores are percentages reported by model creators or benchmark maintainers under varying settings. A blank is preferable to an inferred result. See our methodology.
GPT-5.6 Luna strengths
- Lowest GPT-5.6 list price
- High-volume task fit
- Strong family-level tool support
GPT-5.6 Luna limitations
- Lower peak reasoning than Sol and Terra
- Closed weights
Editorial take: Benchmark rank should narrow a shortlist, not close a purchase. Run a private evaluation with representative prompts, failure cases, latency targets, and total token costs.
Compare GPT-5.6 Luna
- GPT-5.6 Luna vs GPT-5.6 Terra — review fit, trade-offs, listed prices, and an evaluation plan.
Source record
Specifications and scores are linked to the best source located during review. Provider-reported results are not presented as third-party lab reproductions.
Read OpenAI GPT-5.6 announcement ↗