Google: Gemini 3 Flash Preview wins on more metrics (9 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | Google: Gemini 3 Flash Preview | OpenAI: GPT-5 Codex |
|---|---|---|
| Intelligence Index | 46.4✓ | 44.6 |
| Coding Index | 42.6✓ | 38.9 |
| GPQA Diamond | 90%✓ | 84% |
| Design Arena Elo | 1265✓ | 1140 |
| Speed (tokens/sec) | 61✓ | — |
| Latency | 988ms✓ | — |
| Input price /M | $0.500✓ | $1.25 |
| Output price /M | $3.00✓ | $10.00 |
| Context window | 1.0M✓ | 400K |
| Capabilities | ReasoningToolsJSONVisionAudio | ReasoningToolsJSONVision |