# Claude Mythos 5 vs Claude Opus 4.8 (2026): Benchmarks, Price & Verdict | Alher Tech

> Claude Mythos 5 vs Claude Opus 4.8: head-to-head 2026 comparison across Arena Elo, MMLU, GPQA, HumanEval, context window and pricing. Verdict + use cases.

- Canonical page: https://alhertech.com/en/ai-comparison/claude-mythos-5-vs-claude-opus-4-8/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

---

|  | Claude Mythos 5 | Claude Opus 4.8 |
| --- | --- | --- |
| arenaElo | 1493 | 1435 |
| humanEval | 98 | 94.5 |
| sweBench | 78 | 67 |
| mmlu | 95.1 | 93 |
| gpqa | 92 | 67.5 |
| aime | 94.5 | 90 |
| Price in/out ($/M) | $10 / $50 | $5 / $25 |

## Our verdict

Mythos 5 is the most capable Claude, but it stays gated behind Project Glasswing at $10 / $50 per M tokens with always-on thinking and 30-day retention. Opus 4.8 is the practical flagship you can ship on today: generally available at $5 / $25, leading agentic coding and computer use. Pick Mythos 5 only if you have a Glasswing seat and your use case needs the absolute frontier; otherwise Opus 4.8 (or the GA Fable 5) is the default.

[Claude Mythos 5](https://alhertech.com/en/ai-comparison/claude-mythos-5/) · [Claude Opus 4.8](https://alhertech.com/en/ai-comparison/claude-opus-4-8/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)