# GPT-5.5 vs OpenAI o4 (2026): Benchmarks, Price & Verdict | Alher Tech

> GPT-5.5 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/gpt-5-5-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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|  | GPT-5.5 | OpenAI o4 |
| --- | --- | --- |
| arenaElo | 1432 | 1438 |
| humanEval | 94.2 | 94 |
| sweBench | 66 | 72 |
| mmlu | 93 | 92.5 |
| gpqa | 68.7 | 87.1 |
| aime | 92 | 94 |
| Price in/out ($/M) | $12 / $48 | $12 / $48 |

## Our verdict

o4 destroys GPT-5.5 on GPQA (87% vs 69%) but thinks for seconds to minutes per reply. GPT-5.5 wins on everyday throughput, multimodality and cost per interaction. Route hard reasoning to o4, everything else to GPT-5.5.

[GPT-5.5](https://alhertech.com/en/ai-comparison/gpt-5-5/) · [OpenAI o4](https://alhertech.com/en/ai-comparison/o4/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)