GPT-6 Astra vs Claude Fable 5
GPT-6 Astra (OpenAI) and Claude Fable 5 (Anthropic) compared on price, context window, speed and independent benchmarks. GPT-6 Astra scores higher on the Artificial Analysis Intelligence Index (52.7 vs 49.6), while Claude Fable 5 is 1.0× cheaper on a blended basis. Pick GPT-6 Astra for the hardest tasks and Claude Fable 5 when cost dominates.
| GPT-6 Astra | Claude Fable 5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input $/1M | $10.0 | $10.0 |
| Output $/1M | $50.0 | $50.0 |
| Blended $/1M (3:1) | $20.0 | $20.0 |
| Cached input $/1M | $1.00 | $1.00 |
| Context window | 1.1M | 1M |
| Knowledge cutoff | 2026-04 | 2026-01 |
| License | proprietary | proprietary |
| Speed (tok/s) | 58 | 68 |
| Artificial Analysis Intelligence Index | 52.7 | 49.6 |
| LMArena Elo | 1444 | 1493 |
| GPQA Diamond | 96.1% | 92.6% |
| AIME | — | 99.7%* |
| SWE-bench Verified | — | 95% |
| MMLU-Pro | — | 91.5%* |
| Humanity's Last Exam | 54.7% | 55.5% |