Model comparison
GPT-5.6 (Sol, Terra, Luna) vs o3
Capability radar, value bars, and side-by-side posture.
GPT-5.6 (Sol, Terra, Luna)
Not scored
value score
o3
93
value score
GPT-5.6 (Sol, Terra, Luna) ctx
—
o3 ctx
200K
Capability radar
Value · context · multimodal · openness · speed posture
Value head-to-head
- o393
Attribute tape
| Field | GPT-5.6 (Sol, Terra, 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 is OpenAI's three-tier foundation model family comprising Sol (flagship), Terra (balanced/lower-cost), and Luna (fastest/most cost-efficient), available across ChatGPT, Codex, and the OpenAI API. | OpenAI reasoning model focused on hard problems. |