# GPT-5.5 vs GPT-5 (2026): Benchmarks, Price & Verdict | Alher Tech

> GPT-5.5 vs GPT-5: 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-5/
- 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-5 |
| --- | --- | --- |
| arenaElo | 1432 | 1412 |
| humanEval | 94.2 | 91.6 |
| sweBench | 66 | 65 |
| mmlu | 93 | 91.5 |
| gpqa | 68.7 | 63.8 |
| aime | 92 | 92 |
| Price in/out ($/M) | $12 / $48 | $10 / $40 |

## Our verdict

GPT-5.5 pushes Arena Elo past 1430, gains 50% more context (600K vs 400K), and sharpens every benchmark. Pricing rises ~20%. If you're on GPT-5 today, test 5.5 for high-value workloads first; swap en masse once your evals hold.

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