# Claude Mythos vs Grok 4 Heavy (2026): Benchmarks, Price & Verdict | Alher Tech

> Claude Mythos vs Grok 4 Heavy: 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-grok-4-heavy/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
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|  | Claude Mythos | Grok 4 Heavy |
| --- | --- | --- |
| arenaElo | 1478 | 1391 |
| humanEval | 98.7 | 88.4 |
| sweBench | 93.9 | 55 |
| mmlu | 94.2 | 89.3 |
| gpqa | 94.6 | 74.5 |
| aime | 97.6 | 92 |
| Price in/out ($/M) | $25 / $125 | $15 / $60 |

## Our verdict

Grok 4 Heavy uses multi-agent debate to hit 74.5% GPQA at $15 / $60 per M tokens. Mythos posts 94.6% GPQA in a single forward pass at $25 / $125. On Humanity's Last Exam with tools Mythos leads by ~6 points. For most teams Grok 4 Heavy is the pragmatic ceiling. Mythos is the answer when you need maximum capability and have access.

[Claude Mythos](https://alhertech.com/en/ai-comparison/claude-mythos/) · [Grok 4 Heavy](https://alhertech.com/en/ai-comparison/grok-4-heavy/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)