Claude Opus 5.5 vs Claude Fable 5
Claude Opus 5.5 (Anthropic) and Claude Fable 5 (Anthropic) compared on price, context window, speed and independent benchmarks. Claude Opus 5.5 both scores higher on the Artificial Analysis Intelligence Index (57.6 vs 49.6) and is cheaper on a blended basis — 2.5× less than Claude Fable 5.
| Claude Opus 5.5 | Claude Fable 5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input $/1M | $4.00 | $10.0 |
| Output $/1M | $20.0 | $50.0 |
| Blended $/1M (3:1) | $8.00 | $20.0 |
| Cached input $/1M | $0.20 | $1.00 |
| Context window | 1M | 1M |
| Knowledge cutoff | 2026-06 | 2026-01 |
| License | proprietary | proprietary |
| Speed (tok/s) | 85 | 68 |
| Artificial Analysis Intelligence Index | 57.6 | 49.6 |
| LMArena Elo | — | 1493 |
| GPQA Diamond | — | 92.6% |
| AIME | — | 99.7%* |
| SWE-bench Verified | — | 95% |
| MMLU-Pro | — | 91.5%* |
| Humanity's Last Exam | 61.4% | 55.5% |