Claude Fable 5.1 vs Grok 4.6
Claude Fable 5.1 (Anthropic) and Grok 4.6 (xAI) compared on price, context window, speed and independent benchmarks. Claude Fable 5.1 scores higher on the Artificial Analysis Intelligence Index (65.7 vs 60.9), while Grok 4.6 is 6.7× cheaper on a blended basis. Pick Claude Fable 5.1 for the hardest tasks and Grok 4.6 when cost dominates.
| Claude Fable 5.1 | Grok 4.6 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Input $/1M | $10.0 | $2.00 |
| Output $/1M | $50.0 | $6.00 |
| Blended $/1M (3:1) | $20.0 | $3.00 |
| Cached input $/1M | $0.25 | $0.50 |
| Context window | 1M | 500K |
| Knowledge cutoff | 2026-06 | 2026-02 |
| License | proprietary | proprietary |
| Speed (tok/s) | 71 | 60 |
| Artificial Analysis Intelligence Index | 65.7 | 60.9 |
| LMArena Elo | — | 1444 |
| GPQA Diamond | 93.7% | 94.9% |
| Humanity's Last Exam | 59.1% | 42.9% |