# GPT-5.5 vs GPT-4o (2026): Benchmarks, Price & Verdict | Alher Tech

> GPT-5.5 vs GPT-4o: 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-gpt-4o/
- 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 | GPT-4o |
| --- | --- | --- |
| arenaElo | 1432 | 1345 |
| humanEval | 94.2 | 90.2 |
| sweBench | 66 | 33 |
| mmlu | 93 | 88.7 |
| gpqa | 68.7 | 53.6 |
| aime | 92 | 42 |
| Price in/out ($/M) | $12 / $48 | $2.5 / $10 |

## Our verdict

GPT-5.5 beats GPT-4o on every benchmark by double digits and has 4.5× the context. GPT-4o only stays relevant for pipelines that depend on the Realtime API voice stack. New builds should start on GPT-5.5.

[GPT-5.5](https://alhertech.com/en/ai-comparison/gpt-5-5/) · [GPT-4o](https://alhertech.com/en/ai-comparison/gpt-4o/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)