# OpenAI o3 vs GPT-5 (2026): Benchmarks, Price & Verdict | Alher Tech

> OpenAI o3 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/o3-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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|  | OpenAI o3 | GPT-5 |
| --- | --- | --- |
| arenaElo | 1418 | 1412 |
| humanEval | 92.4 | 91.6 |
| sweBench | 69.1 | 65 |
| mmlu | 90.2 | 91.5 |
| gpqa | 83.3 | 63.8 |
| aime | 91.6 | 92 |
| Price in/out ($/M) | $10 / $40 | $10 / $40 |

## Our verdict

o3 reasons deeper but thinks for seconds per reply; GPT-5 is multimodal, faster and slightly better on MMLU. Route hard reasoning tasks to o3, everyday chat and multimodal to GPT-5.

[OpenAI o3](https://alhertech.com/en/ai-comparison/o3/) · [GPT-5](https://alhertech.com/en/ai-comparison/gpt-5/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)