xAI: Grok 4.3 wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.3-Codex | xAI: Grok 4.3 |
|---|---|---|
| Intelligence Index | 53.6✓ | 53.2 |
| Coding Index | 53.1✓ | 41.0 |
| GPQA Diamond | 92%✓ | 90% |
| Design Arena Elo | 1229 | 1255✓ |
| Speed (tokens/sec) | 50 | 66✓ |
| Latency | 3.5s | 746ms✓ |
| Input price /M | $1.75 | $1.25✓ |
| Output price /M | $14.00 | $2.50✓ |
| Context window | 400K | 1M✓ |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |