Anthropic: Claude Opus 4.8 and xAI: Grok 4.3 are evenly matched; the right pick depends on your priorities.
| Metric | Anthropic: Claude Opus 4.8 | xAI: Grok 4.3 |
|---|---|---|
| Intelligence Index | 61.4✓ | 53.2 |
| Coding Index | 56.7✓ | 41.0 |
| GPQA Diamond | 92%✓ | 90% |
| Design Arena Elo | 1372✓ | 1255 |
| Speed (tokens/sec) | 59 | 132✓ |
| Latency | 1.8s | 707ms✓ |
| Input price /M | $5.00 | $1.25✓ |
| Output price /M | $25.00 | $2.50✓ |
| Context window | 1M | 1M |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |