Claude Mythos PreviewvsClaude Fable 5.1
Claude Mythos Preview leads the overall Podium Score by 9.0 points (97.4 vs 88.4).Category wins: Claude Mythos Preview 3 — 1 Claude Fable 5.1.Claude Mythos Preview is the cheaper pick ($15/M vs $15/M per 1M output tokens). Claude Fable 5.1 is faster (85 t/s vs 80 t/s).
Key VerdictAggregated 2026 Benchmark Analysis
Claude Mythos Preview is rated higher overall with a Podium Score of 97.4 (vs 88.4 for Claude Fable 5.1). In head-to-head domain evaluations, Claude Mythos Preview outperforms in 3 of 7 benchmark categories.
Coding & Engineering
Claude Fable 5.1 (95.5)
Inference Speed
Claude Fable 5.1 (85 t/s)
Cost Efficiency
Claude Mythos Preview ($15/M/M)
| Metric | Claude Mythos Preview | Claude Fable 5.1 |
|---|---|---|
| Podium Score | 97.4 ▲ | 88.4 |
| Arena Elo | — | — |
| Intelligence Index | — | — |
| Coding | 80.9 | 95.5 ▲ |
| Math | 100.0 | — |
| Reasoning | 98.8 ▲ | 92.0 |
| Agentic | — | — |
| Knowledge | 100.0 ▲ | 58.0 |
| Multimodal | 100.0 ▲ | 62.0 |
| Long-context | — | — |
| Output speed | 80 t/s | 85 t/s ▲ |
| Output price | $15/M | $15/M |
| Context window | 1000K ▲ | 500K |
Scores aggregated from five independent leaderboards. See Methodology. More head-to-heads: Claude Mythos vs Claude Fable 5 · Claude Mythos vs GPT-6 Astra · Claude Mythos vs Kimi K3 · Claude Mythos vs Claude Opus 5