Model Comparison
Fable 5.1 vs Opus 5
Fable 5.1 ranks #5 on the AI IQ leaderboard with an estimated IQ of 137, while Opus 5 ranks #8 on the AI IQ leaderboard with an estimated IQ of 136. The table below puts the two models side by side across the seven capability dimensions, emotional reasoning, cost, speed, and context window.
Where They Sit on the IQ Bell Curve
Both models highlighted on the standard normal IQ distribution of every tracked model
| Fable 5.1Anthropic | Opus 5Anthropic | |
|---|---|---|
| Rank | #5 | #8 |
| IQ | 137 | 136 |
| Abstract Reasoning | 124 | 125 |
| Mathematical Reasoning | 148 | 144 |
| Academic Reasoning | 136 | 134 |
| Programmatic Reasoning | 147 | 147 |
| Computer Use | 140 | 137 |
| Reliability | 135 | 132 |
| Knowledge Work | 133 | 130 |
| Emotional Reasoning | — | 139 |
| Effective Cost / 1M Tokens | $90.82 | $44.94 |
| Sticker Price / 1M I/O Tokens | $60.00 | $30.00 |
| Speed | 68 tok/s | 57 tok/s |
| Context Window | 1M | 1M |
| Released | 2026-09-01 | 2026-07-24 |
| Open Weights | No | No |
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