Claude Mythos PreviewvsGPT 5.6 Terra Xhigh
Claude Mythos Preview leads the overall Podium Score by 24.4 points (97.4 vs 73.0).Category wins: Claude Mythos Preview 0 — 0 GPT 5.6 Terra Xhigh.GPT 5.6 Terra Xhigh is the cheaper pick ($10/M vs $15/M per 1M output tokens). Claude Mythos Preview is faster (80 t/s vs 50 t/s).
| Metric | Claude Mythos Preview | GPT 5.6 Terra Xhigh |
|---|---|---|
| Podium Score | 97.4 ▲ | 73.0 |
| Arena Elo | — | — |
| Intelligence Index | — | — |
| Coding | 80.9 | — |
| Math | 100.0 | — |
| Reasoning | 98.8 | — |
| Agentic | — | — |
| Knowledge | 100.0 | — |
| Multimodal | 100.0 | — |
| Long-context | — | — |
| Output speed | 80 t/s ▲ | 50 t/s |
| Output price | $15/M | $10/M ▲ |
| Context window | — | 128K |
Scores aggregated from five leaderboards on 2026-08-05. See Methodology. More head-to-heads: Claude Mythos Preview vs Claude Fable 5 · Claude Mythos Preview vs Kimi K3 · Claude Mythos Preview vs Claude Opus 5 · Claude Mythos Preview vs GPT-5.6 Sol