Claude Fable 5.1 vs GPT-6 Sol
Claude Fable 5.1 (Anthropic) and GPT-6 Sol (OpenAI) compared on price, context window, speed and independent benchmarks. Claude Fable 5.1 scores higher on the Artificial Analysis Intelligence Index (53.4 vs 47.5), while GPT-6 Sol is 5.0× cheaper on a blended basis. Pick Claude Fable 5.1 for the hardest tasks and GPT-6 Sol when cost dominates.
| Claude Fable 5.1 | GPT-6 Sol | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input $/1M | $10.0 | $2.00 |
| Output $/1M | $50.0 | $10.0 |
| Blended $/1M (3:1) | $20.0 | $4.00 |
| Cached input $/1M | $0.25 | $0.20 |
| Context window | 1M | 1.1M |
| Knowledge cutoff | 2026-06 | 2026-04 |
| License | proprietary | proprietary |
| Speed (tok/s) | 67 | 107 |
| Artificial Analysis Intelligence Index | 53.4 | 47.5 |
| LMArena Elo | 1508 | — |
| GPQA Diamond | 93.7% | — |
| Humanity's Last Exam | 59.1% | 47.9% |