# Claude Mythos vs OpenAI o4 (2026): Benchmarks, Price & Verdict | Alher Tech

> Claude Mythos vs OpenAI o4: 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-vs-o4/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

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|  | Claude Mythos | OpenAI o4 |
| --- | --- | --- |
| arenaElo | 1478 | 1438 |
| humanEval | 98.7 | 94 |
| sweBench | 93.9 | 72 |
| mmlu | 94.2 | 92.5 |
| gpqa | 94.6 | 87.1 |
| aime | 97.6 | 94 |
| Price in/out ($/M) | $25 / $125 | $12 / $48 |

## Our verdict

o4 was the GPQA king at 87.1%, until Mythos posted 94.6% on the same benchmark and 97.6% on USAMO 2026 (vs ~90% for o4). The catch: o4 is a public reasoning model you can call today, while Mythos is invitation-only. If you need a reasoning monster you can actually deploy this quarter, o4 is the answer. If you are inside Project Glasswing, Mythos is simply the most capable reasoner ever shipped.

[Claude Mythos](https://alhertech.com/en/ai-comparison/claude-mythos/) · [OpenAI o4](https://alhertech.com/en/ai-comparison/o4/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)