OpenAI: GPT-5.6 Terra vs xAI: Grok 4.5
OpenAI: GPT-5.6 Terra and xAI: Grok 4.5 are evenly matched; the right pick depends on your priorities.
| Metric | OpenAI: GPT-5.6 Terra | xAI: Grok 4.5 |
|---|---|---|
| Intelligence Index | 55.0✓ | 53.8 |
| Coding Index | 76.7✓ | 72.4 |
| GPQA Diamond | 93% | 93%✓ |
| Design Arena Elo | — | — |
| Speed (tokens/sec) | 87✓ | 71 |
| Latency | 1.7s | 1.3s✓ |
| Input price /M | $2.50 | $2.00✓ |
| Output price /M | $15.00 | $6.00✓ |
| Context window | 1.1M✓ | 500K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |