Anthropic: Claude Sonnet 5 vs xAI: Grok 4.5
xAI: Grok 4.5 wins on more metrics (6 of 8), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | Anthropic: Claude Sonnet 5 | xAI: Grok 4.5 |
|---|---|---|
| Intelligence Index | 53.4 | 53.8✓ |
| Coding Index | 71.5 | 72.4✓ |
| GPQA Diamond | 91% | 93%✓ |
| Design Arena Elo | 1321✓ | — |
| Speed (tokens/sec) | 64 | 74✓ |
| Latency | 2.2s | 655ms✓ |
| Input price /M | $2.00 | $2.00 |
| Output price /M | $10.00 | $6.00✓ |
| Context window | 1M✓ | 500K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |