Claude Mythos PreviewvsClaude 5.5 Haiku
Claude Mythos Preview leads the overall Podium Score by 9.9 points (97.4 vs 87.5).Category wins: Claude Mythos Preview 4 — 1 Claude 5.5 Haiku.Claude 5.5 Haiku is the cheaper pick ($4/M vs $15/M per 1M output tokens). Claude 5.5 Haiku is faster (145 t/s vs 80 t/s).
Claude Mythos PreviewDrag slider or hover to compareClaude 5.5 Haiku
Quick VerdictAggregated 2026 Benchmark Analysis
Claude Mythos Preview is rated higher overall with a Podium Score of 97.4 (vs 87.5 for Claude 5.5 Haiku). In head-to-head domain evaluations, Claude Mythos Preview outperforms in 4 of 7 benchmark categories.
Coding & Engineering
Claude 5.5 Haiku (84.0)
Inference Speed
Claude 5.5 Haiku (145 t/s)
Cost Efficiency
Claude 5.5 Haiku ($4/M)
API Price / 1M (in · out)
Claude Mythos $3/M · $15/M — Claude 5.5 Haiku $0.8/M · $4/M
Choose Claude Mythos Preview for math and quantitative work, and Claude 5.5 Haiku for coding and software engineering.
| Metric | Claude Mythos Preview | Claude 5.5 Haiku |
|---|---|---|
| Podium Score | 97.4 ▲ | 87.5 |
| Arena Elo | — | 1410 |
| Intelligence Index | — | 88.0 |
| Coding | 80.9 | 84.0 ▲ |
| Math | 100.0 ▲ | 86.5 |
| Reasoning | 98.8 ▲ | 88.0 |
| Agentic | — | 78.5 |
| Knowledge | 100.0 ▲ | 81.0 |
| Multimodal | 100.0 ▲ | 88.0 |
| Long-context | — | 91.0 |
| Output speed | 80 t/s | 145 t/s ▲ |
| Output price | $15/M | $4/M ▲ |
| Context window | 1000K ▲ | 500K |
Scores aggregated from five independent leaderboards. See Methodology. More head-to-heads: Claude Mythos vs Claude 5.5 Sonnet · Claude Mythos vs Kimi K3.1 Pro · Claude Mythos vs Eleven Multilingual v3 · Claude Mythos vs FLUX.2 Pro