Claude Sonnet 5.5 vs Claude Fable 5.1
Claude Sonnet 5.5 and Claude Fable 5.1 side by side on shared benchmark boards, Codex Radar runs and the lowest real price per million tokens.
| Best score per board | Claude Sonnet 5.5 | Claude Fable 5.1 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Artificial Analysis Intelligence Index v4.3 | 56.0 | 53.4 |
| Terminal-Bench 4.0 | — | 57.9 |
| Terminal-Bench 4.0 (AA) | 63.6 | 55.1 |
| Code Arena | WebDev Overall | 1709.0 | 1751.0 |
| Agent Arena · Overall (Ranking / Pareto) | — | 14.6 |
| Artificial Analysis Coding Agent Index v1.5 | 68.4 | 62.2 |
| OpenDesign Arena · Quality ranking | 86.8 | 80.3 |
| Radar IQ (Codex) | — | — |
| Lowest real price / MTok | $0.0027 | $0.116 |
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