# Grok 4 Heavy vs OpenAI o4 (2026): Benchmarks, Price & Verdict | Alher Tech

> Grok 4 Heavy 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/grok-4-heavy-vs-o4/
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|  | Grok 4 Heavy | OpenAI o4 |
| --- | --- | --- |
| arenaElo | 1391 | 1438 |
| humanEval | 88.4 | 94 |
| sweBench | 55 | 72 |
| mmlu | 89.3 | 92.5 |
| gpqa | 74.5 | 87.1 |
| aime | 92 | 94 |
| Price in/out ($/M) | $15 / $60 | $12 / $48 |

## Our verdict

o4 is cleaner on GPQA and has a tighter ecosystem. Grok 4 Heavy's multi-agent debate mode occasionally beats o4 on Humanity's Last Exam-style evals but costs more per answer. For production reasoning, o4. For research benchmarks, either.

[Grok 4 Heavy](https://alhertech.com/en/ai-comparison/grok-4-heavy/) · [OpenAI o4](https://alhertech.com/en/ai-comparison/o4/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)