Google: Gemini 3.5 Flash vs OpenAI: GPT-5.6 Luna
OpenAI: GPT-5.6 Luna wins on more metrics (5 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | Google: Gemini 3.5 Flash | OpenAI: GPT-5.6 Luna |
|---|---|---|
| Intelligence Index | 50.2 | 51.2✓ |
| Coding Index | 70.1 | 71.4✓ |
| GPQA Diamond | 92%✓ | 91% |
| Design Arena Elo | 1313✓ | — |
| Speed (tokens/sec) | 168✓ | 60 |
| Latency | 1.0s✓ | 1.7s |
| Input price /M | $1.50 | $1.00✓ |
| Output price /M | $9.00 | $6.00✓ |
| Context window | 1.0M | 1.1M✓ |
| Capabilities | ReasoningToolsJSONVisionAudio | ReasoningToolsJSONVision |