Anthropic: Claude Fable 5 and xAI: Grok 4.3 are evenly matched; the right pick depends on your priorities.
| Metric | Anthropic: Claude Fable 5 | xAI: Grok 4.3 |
|---|---|---|
| Intelligence Index | 64.9✓ | 53.2 |
| Coding Index | 62.0✓ | 41.0 |
| GPQA Diamond | 93%✓ | 90% |
| Design Arena Elo | 1417✓ | 1255 |
| Speed (tokens/sec) | — | 132✓ |
| Latency | — | 707ms✓ |
| Input price /M | $10.00 | $1.25✓ |
| Output price /M | $50.00 | $2.50✓ |
| Context window | 1M | 1M |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |