OpenAI: GPT-5.6 Luna vs OpenAI: GPT-5.6 Terra Pro
OpenAI: GPT-5.6 Luna wins on more metrics (6 of 7), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.6 Luna | OpenAI: GPT-5.6 Terra Pro |
|---|---|---|
| Intelligence Index | 51.2✓ | — |
| Coding Index | 71.4✓ | — |
| GPQA Diamond | 91%✓ | — |
| Design Arena Elo | — | — |
| Speed (tokens/sec) | 75 | 154✓ |
| Latency | 1.3s✓ | 5.2s |
| Input price /M | $1.00✓ | $2.50 |
| Output price /M | $6.00✓ | $15.00 |
| Context window | 1.1M | 1.1M |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |