Model comparison
GPT-5.6 Luna vs o3
Capability radar, value bars, and side-by-side posture.
GPT-5.6 Luna
Not scored
value score
o3
93
value score
GPT-5.6 Luna ctx
—
o3 ctx
200K
Capability radar
Value · context · multimodal · openness · speed posture
Value head-to-head
- o393
Attribute tape
| Field | GPT-5.6 Luna | o3 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context | — | 200K |
| Modalities | Text, Code | |
| Openness | — | Proprietary Model |
| Speed | — | — |
| Price | — | $10/1M in · $40/1M out |
| Value score | — | 93 |
| Summary | GPT-5.6 Luna is OpenAI's smallest, fastest, and most cost-efficient model in the GPT-5.6 family, designed for high-volume, cost-sensitive workloads such as classification, extraction, chat, and lightweight agent workflows. It offers a 1,050,000-token context window and 128,000 max output tokens, positioned as the throughput-optimized tier below Terra (balanced) and Sol (flagship). | OpenAI reasoning model focused on hard problems. |